Some Quick Science GK
No. | Question | Answer |
---|---|---|
01 | The theory of relativity was propounded by | Albert Einstein |
02 | The principal metal used in manufacturing steel is | Iron |
03 | An altimeter is used for measuring | Altitude |
04 | Oology is the study of | Birds eggs |
05 | Radioactivity was discovered by | Henry Bacquerel |
06 | The metal used in storage batteries is | Lead |
07 | The instrument used to measure the relative humidity of air is | Hygrometer |
08 | Barometer was invented by | Torricelli |
09 | The unit of power is | Watt |
10 | Radium was discovered by | Marie and Pierrie Curie |
11 | The existence of isotopes was discovered by | Frederick Soddy |
12 | Dynamo was invented by | Michael Faraday |
13 | The nuclear reactor was invented by | Enrico Ferni |
14 | The law of gravitation was propounded by | Sir Isaac Newton |
15 | Crescograph was invented by | J.C.Bose |
16 | Crescograph is used to measure the | Rate of growth of a plant |
17 | Galileo’sfirst scientific discovery was | Pendulum |
18 | Microscope was invented by | Aaton Van Leewen Hock |
19 | The scientist who is known as father of modern biology is | Aristotle |
20 | The first person to see a cell under microscope was | Robert Hooke |
21 | The smallest flowering plant is | Worffia |
22 | The four blood groups were discovered by | Karl Landsteiner |
23 | Sodium was discovered by | Sir Humphry Davy |
24 | The atomic number of oxygen is | Eight |
25 | The basic building blocks of proteins are | Amino acids |
26 | The botanical name of the cotton plant is | Gossipium Hirsutum |
27 | An Electroscope is used to | Detect charges on a body |
28 | The unit of loudness is | Phon |
29 | An ammeter is used to measure | Electric current |
30 | Plant that eat insects are called | Insectivorous plants |
31 | Fruits that are formed without fertilization are called | Parthenocarpic |
32 | Plants that flower only once in their lifetime are called | Mono carpic |
33 | The botanical name for rice is | Oryza Sativa |
34 | Penicillin is obtained from | Mould |
35 | The largest tree in the world is | Seguoia Gigantica |
36 | Herpetology is the study of | Reptiles |
37 | Entomology is the study of | Insects |
38 | Ornithology is the study of | Birds |
39 | Ichtyology is the study of | Fishes |
40 | Osteology is the study of | Bones |
41 | The botanical name for brinjal is | Solanum melongenal |
42 | The botanical name for onion is | Allium Cepa |
43 | The study of sound is called | Acoustics |
44 | The study of heavenly bodies is called | Astronomy |
45 | The study of tissues is called | Histology |
46 | Electric Lamp was invented by | Thomas alva Edison |
47 | The fear of crowd is called | Ochlophobia |
48 | The fear of books is called | Bibliophobia |
49 | The fear of going to bed is called | Clinophobia |
50 | The symbol of gold is | Au |
51 | The symbol of sodium is | Na |
52 | The symbol of Sr stands for | Strontium |
53 | The symbol Rb stands for | Rubidium |
54 | The symbol Md stands for | Mendelevium |
55 | Calcium sulphate is commonly called | Plaster of Paris |
56 | Sodium carbonate is commonly called | Washing Soda |
57 | Sodium chloride is commonly known as | Common Salt |
58 | The chemical name of Chloroform is | Trichloromethane |
59 | The chemical name of baking powder is | Sodium bicarbonate |
60 | The chemical name of bleaching powder is | Calcium hypochlorite |
61 | The formula HCL stands for | Hydrochloric Acid |
62 | The formula H2SO4 stands for | Sulphuric Acid |
63 | The formula CHCI3 stands for | Trichloromethane |
64 | The formula H2O2 stands for | Hydrogen peroxide |
65 | A fungus which can only survive on other living organisms is called | Obligate Parasite |
66 | A plant which lives in the dark is called | Scotophyte |
67 | A plant adapted to live in dry places is called a | Xerophyte |
68 | A plant adapted for growth in water is called a | Hydrophyte |
69 | Bifocal lens was invented by | Benjamin Franklin |
70 | Cement was invented by | Joseph Aspdin |
71 | Laser was invented by | Dr.Charles H.Townes |
72 | Electromagnet was invented by | William Sturgeon |
73 | Rayon was invented by | Sir Joseph Swann |
74 | Thermostat is an instrument used for regulating | Constant temperature |
75 | The science of organic forms and structures is known as | Morphology |
76 | Phycology is the study of | Algae |
77 | Tata Institute of Fundamental Research was established in | 1945 |
78 | CSIR stands for | Council of Scientific and Industrial Research |
79 | ISRO stands for | Indian Space Research Organisation |
80 | The first human being to land on moon was | Neil Armstrong |
81 | The first Indian in space was | Rakesh Sharma |
82 | ISAC stands for | ISRO Satellite Centre |
83 | VSSC stands for | Vikram Sarabhai space Centre |
84 | The headquarters of ISRO is located at | Bangalore |
85 | VSSC is located at | Thiruvananthapuram |
86 | ISAC is located at | Bangalore |
87 | National Science Centre is located at | New Delhi |
88 | Central Tobacco Research Institute is located at | Rajahmundry |
89 | Indian Institute of Horticultural Research is located at | Bangalore |
90 | The Atomic Energy Commission was set up in | August 1948 |
91 | The first IndianSatellite was | Aryabhatta |
92 | The first Indian Satellite was launched in the year | 1975 |
93 | ASLV stands for | Augmented Satellite Launch Vehicle |
94 | INSAT stands for | Indian National Satellite |
95 | The fear of women is known as | Gynophobia |
96 | The fear of men is known as | Androphobia |
97 | The scientist who developed the Quantum theory was | Max Plonck |
98 | The steam engine was invented by | James Watt |
99 | The botanical name of tea is | Camellia Sinensis |
100 | Logarithms were devised by | John Napier |
101 | The acid used in a car battery is | Sulphuric acid |
102 | The system for writing by blind people was invented by | Louis Braille |
103 | The parachute was used for the first time by | J.P.Blanchard |
104 | The German physicit who first demonstrated the existence of Radio waves was | Henrich Hertz |
105 | The instrument that records the intensity of earthquakes is | Seismograph |
106 | The laws of floating bodies was discovered by | Archimedes |
107 | The density of milk is measured by a | Lactometer |
108 | Fountain pen was invented by | L.E.Waterman |
109 | The instrument used to measure the pressure of gases is the | Monometer |
110 | Bhaskara I was a famous | Astronomer |
111 | The first atomic power station established in India was the | Tarapore Atomic Power Station |
112 | The role of heredity was demonstrated by | Mendel |
113 | The instrument used to measure the concentration of salt water is the | Salinometer |
114 | Spectroscopy is the study of | Anders John Angstrom |
115 | Dactylography is the study of | Finger Prints |
116 | A tangent galvanometer is used to study the | Strength of direct current |
117 | The fruit of Oak is called | Acron |
118 | ZETA stands for | Zero Energy Thermonuclear Assembly |
119 | The formula C6H5OH stands for | Phenol |
120 | Michael Faraday worked as an assistant under another scientist whose name was | Sir Humphry Davy |
121 | Vulcanised rubber was invented by | Charles Goodyear |
122 | The symbol Zn stands for | Zinc |
123 | The symbol He stands for | Helium |
124 | Celluloid was invented by | A.Parker |
125 | Glider was invented by | Sir George Caley |
126 | Safety matches was invented by | J.E.Lundstrom |
127 | Radio valve was invented by | Sir J.A.Fleming |
128 | Space Applications Centre is located at | Ahmedabad |
129 | Atomic Energy Commission is located at | Mumbai |
130 | Dynamics is the study of | Movements of bodies |
131 | Statics is the study of | Forces acting on bodies at rest |
132 | Mechanics is the study of | Forces acting on bodies |
133 | Zoology is the study of | Animal life |
134 | Botany is the study of | Plant life |
135 | Psychology is the study of | Human mind |
136 | The first American to orbit earth was | John H.Glen |
137 | The electro-cardiograph was invented by | William Einthoven |
138 | The molecular formula of cane sugar is | C12H22O11 |
139 | A compound which contains only hydrogen and Carbon is called a | Hydrocarbon |
140 | The liquid used to preserve specimens of plans and animals is | Formalin |
141 | The law of segregaton was propounded by | Mendel |
142 | Auriscope is used to detect | Ear disorders |
143 | The three states of matter are | Solid,liquid and gas |
144 | The scientific name for blood platelets is | Thrombocytes |
145 | The response of a plant to heat is called | Thermotropism |
146 | The response of a plant to touch is called | Trigmotropism |
147 | The symbol Zr stands for | Zirconium |
148 | Nickel was discovered by | Cronstledt |
149 | Manganese was discovered by | Gahn |
150 | The common name for pottasium carbonate is | Potash |
151 | Bismuth was discovered by | Valentine |
152 | The biggest plant seed is | Cocodemer |
153 | Toxicology is the study of | Poisons |
154 | Virology is the study of | Viruses |
155 | Paleontology is the study of | Fossils |
156 | Calorimeter is used to measure | Quantity of heat |
157 | Chronometer was invented by | John Harrison |
158 | Stethoscope was invented by | William Stockes |
159 | Spinning frame was invented by | Sir Richard Arkwright |
160 | Al stands for | Aluminium |
161 | Gd stands for | Gadolinium |
162 | Ir stands for | Iridium |
163 | Bi stands for | Bismuth |
164 | The Chemical formula of sodium bicarbonate is | NaHCO3 |
165 | The chemical formula of common salt is | Nacl |
166 | The chemical formula of washing soda is | Na2CO3,IOH2O |
167 | The chemical formula of lime soda is | CaCO3 |
168 | The chemical formula of chloroform is | CHcl3 |
169 | The study of grasses is known as | Agrostology |
170 | The study of antiquities is known as | Archaeology |
171 | The study of the duration of life is known as | Chronobiology |
172 | The study of bacteria is known as | Bacteriology |
173 | Nylon was invented by | Dr.Wallace H.Carothers |
174 | Electric razor was invented by | Jacob Schick |
175 | The symbol of silver is | Ag |
176 | The symbol of silicon is | Si |
177 | The symbol of titanium is | Ti |
178 | Calcium oxide is commonly known as | Quick lime |
179 | A deviation of light passing from one medium to another is known as | Refraction |
180 | An apparatus for generation of atomic energy is called a | Reactor |
181 | A machine used for converting mechanical energy into electrical energy is called a | Generator |
182 | The first Indian woman in space was | Kalpana Chawla |
183 | The revolver was invented by | Samuel Colt |
184 | The refrigerator was invented by | J.Perkins |
Science Question Answers – Part 4
76. Question: Why is a new quilt warmer than an old one?
Answer: In a new quilt the cotton is not compressed and as such it encloses more air which is bad conductor of heat. Therefore, it does not allow heat to pass.
Answer: In a new quilt the cotton is not compressed and as such it encloses more air which is bad conductor of heat. Therefore, it does not allow heat to pass.
77. Question: Curved rail tracks or curved roads are banked or raised on one side. Why?
Answer: Because a fast moving train or vehicle leans inwards while taking turn and the banked or raised track provides required centripetal force to enable it to move round the curve.
Answer: Because a fast moving train or vehicle leans inwards while taking turn and the banked or raised track provides required centripetal force to enable it to move round the curve.
78. Question: How do bats fly in dark?
Answer: When bats fly they produce ultrasonic sound waves which are reflected back to them from the obstacles in their way and hence they can fly without difficulty.
Answer: When bats fly they produce ultrasonic sound waves which are reflected back to them from the obstacles in their way and hence they can fly without difficulty.
79. Question: Water pipes often burst at hill stations on cold frosty nights. Why?
Answer: The temperature may fall below 00C during cold frosty nights which converts the water inside the pipes into ice, resulting in an increase in volume. This exerts great force on the pipes and as a result, they burst.
Answer: The temperature may fall below 00C during cold frosty nights which converts the water inside the pipes into ice, resulting in an increase in volume. This exerts great force on the pipes and as a result, they burst.
80. Question: Why are white clothes more comfortable in summer than dark or black ones?
Answer: White clothes are good reflectors and bad absorbers of heat, whereas dark or black clothes are good absorbers of heat. Therefore, white clothes are more comfortable because they do not absorb heat from the sun rays.
Answer: White clothes are good reflectors and bad absorbers of heat, whereas dark or black clothes are good absorbers of heat. Therefore, white clothes are more comfortable because they do not absorb heat from the sun rays.
81. Question: Why does a rose appear red grass green in daylight?
Answer: Rose absorbs all the constituent colors of white light except red which is reflected to us. Similarly, grass absorbs all colors except green which is reflected t us.
Answer: Rose absorbs all the constituent colors of white light except red which is reflected to us. Similarly, grass absorbs all colors except green which is reflected t us.
82. Question: Why does a ship rise as it enters the sea from a river?
Answer: The density of sea water is high due to impurities and salts compared to river water as a result; the upthurst produced by the sea water on the ship is more than that of river water.
Answer: The density of sea water is high due to impurities and salts compared to river water as a result; the upthurst produced by the sea water on the ship is more than that of river water.
83. Question: Why are fuse provided in electric installations?
Answer: A safety fuse is made of a wire of metal having a very low melting point. When excess current flows in, the wire gets heated, melts and breaks the circuit. By breaking the circuit it saves electric equipment or installations from damage by excessive flow of current.
Answer: A safety fuse is made of a wire of metal having a very low melting point. When excess current flows in, the wire gets heated, melts and breaks the circuit. By breaking the circuit it saves electric equipment or installations from damage by excessive flow of current.
84. Question: Why is it easier to lift a heavy object under water than in air?
Answer: Because when a body is immersed in water, it experiences an upward thrust (Archimedes? Principle) and loses weight equal to the weight of the water displaced by its immersed potion, and hence, is easier to lift objects.
Answer: Because when a body is immersed in water, it experiences an upward thrust (Archimedes? Principle) and loses weight equal to the weight of the water displaced by its immersed potion, and hence, is easier to lift objects.
85. Question: If a highly pumped up bicycle tyre is left in the hot sunlight, it bursts. Why?
Answer: The air inside the tube increases in volume when heated up. As sufficient space for the expansion of the air is not available because the tube is already highly pumped, it may result in bursting of the tyre.
Answer: The air inside the tube increases in volume when heated up. As sufficient space for the expansion of the air is not available because the tube is already highly pumped, it may result in bursting of the tyre.
86. Question: What will be the color of green in blue light?
Answer: Grass will appear dark in color because it absorbs all other colors of the light except its own green color. The blue light falling on grass will be absorbed by it, and hence, it will appear dark in color.
Answer: Grass will appear dark in color because it absorbs all other colors of the light except its own green color. The blue light falling on grass will be absorbed by it, and hence, it will appear dark in color.
87. Question: Why do two eyes give better vision than one?
Answer: Because two eyes do not form exactly similar images and he fusion of these two dissimilar images in the brain gives three dimensions of the stereoscopic vision.
Answer: Because two eyes do not form exactly similar images and he fusion of these two dissimilar images in the brain gives three dimensions of the stereoscopic vision.
Science Question Answers – Part 3
51. Question: Why is it less difficult to cook rice or potatoes at higher altitudes?
Answer: Atmospheric pressure at higher altitudes is low and boils water below 1000C. The boiling point of water is directly proportional to the pressure on its surface.
Answer: Atmospheric pressure at higher altitudes is low and boils water below 1000C. The boiling point of water is directly proportional to the pressure on its surface.
52. Question: Why is it difficult to breathe at higher altitudes?
Answer: Because of low air pressure at higher altitudes the quantity of air is less, and so that of oxygen.
Answer: Because of low air pressure at higher altitudes the quantity of air is less, and so that of oxygen.
53. Question: Why are winter nights and summer nights warmer during cloudy weather than when the sky is clear?
Answer: Clouds being bad conductors of heat do not permit radiation of heat from land to escape into the sky. As this heat remains in the atmosphere, the cloudy nights are warmer.
Answer: Clouds being bad conductors of heat do not permit radiation of heat from land to escape into the sky. As this heat remains in the atmosphere, the cloudy nights are warmer.
54. Question: Why is a metal tyre heated before it is fixed on wooden wheels?
Answer: On heating, the metal tyre expands by which its circumference also increases. This makes fixing the wheel easier and therefore cooling down shrinks it; thus fixing the tyre tightly.
Answer: On heating, the metal tyre expands by which its circumference also increases. This makes fixing the wheel easier and therefore cooling down shrinks it; thus fixing the tyre tightly.
55. Question: Why is it easier to swim in the sea than in a river?
Answer: The density of sea water is higher; hence the up thrust is more than that of river water.
Answer: The density of sea water is higher; hence the up thrust is more than that of river water.
56. Question: Who will possibly learn swimming faster-a fat person or a thin person?
Answer: The fat person displaces more water which will help him float much more freely compared to a thin person.
Answer: The fat person displaces more water which will help him float much more freely compared to a thin person.
57. Question: Why is a flash of lightening seen before thunder?
Answer: Because light travels faster than sound, it reaches the earth before the sound of thunder.
Answer: Because light travels faster than sound, it reaches the earth before the sound of thunder.
58. Question: Why cannot a petrol fire be extinguished by water?
Answer: Water, which is heavier than petrol, slips down permitting the petrol to rise to the surface and continue to burn. Besides, the existing temperature is so high that the water poured on the fire evaporates even before it can extinguish the fire. The latter is true if a small quantity of water is poured.
Answer: Water, which is heavier than petrol, slips down permitting the petrol to rise to the surface and continue to burn. Besides, the existing temperature is so high that the water poured on the fire evaporates even before it can extinguish the fire. The latter is true if a small quantity of water is poured.
59. Question: Why does water remain cold in an earthen pot?
Answer: There are pores in an earthen pot which allow water to percolate to the outer surface. Here evaporation of water takes place thereby producing a cooling effect.
Answer: There are pores in an earthen pot which allow water to percolate to the outer surface. Here evaporation of water takes place thereby producing a cooling effect.
60. Question: Why do we place a wet cloth on the forehead of a patient suffering from high temperature?
Answer: Because of body?s temperature, water evaporating from the wet cloth produces a cooling effect and brings the temperature down.
Answer: Because of body?s temperature, water evaporating from the wet cloth produces a cooling effect and brings the temperature down.
61. Question: When a needle is placed on a small piece of blotting paper which is place on the surface of clean water, the blotting paper sinks after a few minutes but the needle floats. However, in a soap solution the needle sinks. Why?
Answer: The surface tension of clean water being higher than that of a soap solution, it cans support the weight of a needle due to its surface tension. By addition of soap, the surface tension of water reduces, thereby resulting in the sinking of the needle.
Answer: The surface tension of clean water being higher than that of a soap solution, it cans support the weight of a needle due to its surface tension. By addition of soap, the surface tension of water reduces, thereby resulting in the sinking of the needle.
62. Question: To prevent multiplication of mosquitoes, it is recommended to sprinkle oil in the ponds with stagnant water. Why?
Answer: Mosquitoes breed in stagnant water. The larvae of mosquitoes keep floating on the surface of water due to surface tension. However, when oil is sprinkled, the surface tension is lowered resulting in drowning and death of the larvae.
Answer: Mosquitoes breed in stagnant water. The larvae of mosquitoes keep floating on the surface of water due to surface tension. However, when oil is sprinkled, the surface tension is lowered resulting in drowning and death of the larvae.
63. Question: Why does oil rise on a cloth tape of an oil lamp?
Answer: The pores in the cloth tape suck oil due to the capillary action of oil.
Answer: The pores in the cloth tape suck oil due to the capillary action of oil.
64. Question: Why are ventilators in a room always made near the roof?
Answer: The hot air being lighter in weight tends to rise above and escape from the ventilators at the top. This allows the cool air to come in the room to take its place.
Answer: The hot air being lighter in weight tends to rise above and escape from the ventilators at the top. This allows the cool air to come in the room to take its place.
65. Question: How does ink get filled in a fountain pen?
Answer: When the rubber tube of a fountain pen immersed in ink is pressed, the air inside the tube comes out and when the pressure is released the ink rushes in to fill the air space in the tube.
Answer: When the rubber tube of a fountain pen immersed in ink is pressed, the air inside the tube comes out and when the pressure is released the ink rushes in to fill the air space in the tube.
66. Question: Why are air coolers less effective during the rainy season?
Answer: During the rainy reason, the atmosphere air is saturated with moisture. Therefore, the process of evaporation of water from the moist pads of the cooler slows down thereby not cooling the air blown out from the cooler.
Answer: During the rainy reason, the atmosphere air is saturated with moisture. Therefore, the process of evaporation of water from the moist pads of the cooler slows down thereby not cooling the air blown out from the cooler.
67. Question: Why does grass gather more dew in nights than metallic objects such as stones?
Answer: Grass being a good radiator enables water vapour in the air to condense on it. Moreover, grass gives out water constantly (transpiration) which appears in the form of dew because the air near grass is saturated with water vapour and slows evaporation. Dew is formed on objects which are good radiations and bad conductors.
Answer: Grass being a good radiator enables water vapour in the air to condense on it. Moreover, grass gives out water constantly (transpiration) which appears in the form of dew because the air near grass is saturated with water vapour and slows evaporation. Dew is formed on objects which are good radiations and bad conductors.
68. Question: If a lighted paper is introduced in a jar of carbon dioxide, its flame extinguishes. Why?
Answer: Because carbon dioxide does not help in burning. For burning, oxygen is required.
Answer: Because carbon dioxide does not help in burning. For burning, oxygen is required.
69. Question: Why does the mass of an iron increase on rusting?
Answer: Because rust is hydrated ferric oxide which adds to the mass of the iron rod. The process of rusting involves addition of hydrogen and oxygen elements to iron.
Answer: Because rust is hydrated ferric oxide which adds to the mass of the iron rod. The process of rusting involves addition of hydrogen and oxygen elements to iron.
70. Question: Why does milk curdle?
Answer: Lactose (milk sugar) content of milk undergoes fermentation and changes into lactic acid which on reacting with milk protein (casein) form curd.
Answer: Lactose (milk sugar) content of milk undergoes fermentation and changes into lactic acid which on reacting with milk protein (casein) form curd.
71. Question: Why does hard water not lather soap profusely?
Answer: Hard water contains sulphates and chlorides of magnesium and calcium which forms an insoluble compound with soap. Therefore, soap does not lather with hard water.
Answer: Hard water contains sulphates and chlorides of magnesium and calcium which forms an insoluble compound with soap. Therefore, soap does not lather with hard water.
72. Question: Why is it dangerous to have charcoal fire burning in a closed room?
Answer: When charcoal burns it produces carbon monoxide which is suffocating and can cause death.
Answer: When charcoal burns it produces carbon monoxide which is suffocating and can cause death.
73. Question: Why is it dangerous to sleep under trees at night?
Answer: Plants respire at night and give out carbon dioxide which reduces the oxygen content of air required for breathing.
Answer: Plants respire at night and give out carbon dioxide which reduces the oxygen content of air required for breathing.
74. Question: Why does ENO’s salt effervesce on addition of water?
Answer: It contains tartaric acid and sodium bicarbonate. On adding water, carbon dioxide is produced which when released into water causes effervescence.
Answer: It contains tartaric acid and sodium bicarbonate. On adding water, carbon dioxide is produced which when released into water causes effervescence.
75. Question: Why does milk turn sour?
Answer: The microbes react with milk and grow. They turn lactose into lactic acid which is sour in taste.
Answer: The microbes react with milk and grow. They turn lactose into lactic acid which is sour in taste.
Science Question Answers – Part 2
26. Question: Why does a thermometer kept in boiling water show no change in reading after 1000C?
Answer: The boiling point of water is 1000C. Once water starts boiling at this temperature, thermometer records no change in temperature. The quantity of heat supplied is being utilized as latent heat of evaporation to convert the water at boiling point into vapour.
Answer: The boiling point of water is 1000C. Once water starts boiling at this temperature, thermometer records no change in temperature. The quantity of heat supplied is being utilized as latent heat of evaporation to convert the water at boiling point into vapour.
27. Question: Why do we bring our hands close to the mouth while shouting across to someone far away?
Answer: By keeping hands close to mouth the sound is not allowed to spread (Phenomenon of diffraction of sound) in all direction, but is directed to a particular direction and becomes louder.
Answer: By keeping hands close to mouth the sound is not allowed to spread (Phenomenon of diffraction of sound) in all direction, but is directed to a particular direction and becomes louder.
28. Question: Why does a corked bottle filled with water burst if left out on a frosty night?
Answer: Because of low temperature the water inside the bottle freezes. On freezing it expands, thereby its volume increases and pressure is exerted on the walls.
Answer: Because of low temperature the water inside the bottle freezes. On freezing it expands, thereby its volume increases and pressure is exerted on the walls.
29. Question: Why is a small gap left at the joint between two rails?
Answer: To permit expansion of rails due to heat generated by friction of a moving train.
Answer: To permit expansion of rails due to heat generated by friction of a moving train.
30. Question: Why cannot a copper wire be used to make elements in electric heater?
Answer: Copper melts at 108.30C and forms a black powder on reacting with atmospheric oxygen. For heater elements a metal should have more resistance to produce heat.
Answer: Copper melts at 108.30C and forms a black powder on reacting with atmospheric oxygen. For heater elements a metal should have more resistance to produce heat.
31. Question: Why are water or mercury droplets always round when dropped on a clean glass?
Answer: The surface of a liquid is the seat of a special force as a result of which molecules on the surface are bound together to form something like a stretched membrane. They tend to compress the molecules below to the smallest possible volume, which causes the drop to take a round shape as for a given mass he sphere has minimum volume.
Answer: The surface of a liquid is the seat of a special force as a result of which molecules on the surface are bound together to form something like a stretched membrane. They tend to compress the molecules below to the smallest possible volume, which causes the drop to take a round shape as for a given mass he sphere has minimum volume.
32. Question: Why does a balloon filled with hydrogen rise in the air?
Answer: Weight of hydrogen is less than the weight of air displaced by it. In balloons hydrogen is normally filled because it is lighter than air.
Answer: Weight of hydrogen is less than the weight of air displaced by it. In balloons hydrogen is normally filled because it is lighter than air.
33. Question: Why do we lean forward while climbing a hill?
Answer: In order to keeps the vertical line passing through our centre of gravity always between our feet, which is essential to attain equilibrium or stability.
Answer: In order to keeps the vertical line passing through our centre of gravity always between our feet, which is essential to attain equilibrium or stability.
34. Question: Why does smoke curl up in the air?
Answer: Smoke contains hot gases which being lighter in weight, follows a curved path because of the eddy currents that are set up in the air.
Answer: Smoke contains hot gases which being lighter in weight, follows a curved path because of the eddy currents that are set up in the air.
35. Question: Why does an electric bulb explode when it is broken?
Answer: The bulb encompasses partial vacuum and as it breaks, air rushes in causing a small explosion.
Answer: The bulb encompasses partial vacuum and as it breaks, air rushes in causing a small explosion.
36. Question: Why does a man fall forward when he jumps out of a running train or bus?
Answer: He is in motion while in the train or bus. When he jumps out, his feet comes to rest while touching the ground but his upper portion which is still in motion propels him forward.
Answer: He is in motion while in the train or bus. When he jumps out, his feet comes to rest while touching the ground but his upper portion which is still in motion propels him forward.
37. Question: Why does an ordinary glass tumbler crack when very hot tea or milk is poured in it?
Answer: When a hot liquid is poured into a tumbler, the inner layer of the tumbler gets heated, it expands before the outer layer and an unequal expansion of both layers causes the tumbler to crack.
Answer: When a hot liquid is poured into a tumbler, the inner layer of the tumbler gets heated, it expands before the outer layer and an unequal expansion of both layers causes the tumbler to crack.
38. Question: Why is a compass used as an indicator of direction?
Answer: The magnetic needles of a compass under the influence f the earth?s magnetic field lie in a north-south direction. Hence, we can identify direction.
39. Question: Why is water from a hand pump warm in winter and cold in summer?
Answer: In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
Answer: In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
41. Question: Why is a rainbow seen after a shower?
Answer: After a shower, the clouds containing water droplets act like a prism through which the white light is dispersed producing a spectrum.
Answer: After a shower, the clouds containing water droplets act like a prism through which the white light is dispersed producing a spectrum.
42. Question: Why does a swimming pool appear less deep than is actually is?
Answer: The rays of light coming from the bottom of the pool pass from a denser medium (water) to a rarer medium (air) and are refracted (bend away from the normal). When the rays return to the surface, they form an image of the bottom of the pool at a point, which is little above the real position.
Answer: The rays of light coming from the bottom of the pool pass from a denser medium (water) to a rarer medium (air) and are refracted (bend away from the normal). When the rays return to the surface, they form an image of the bottom of the pool at a point, which is little above the real position.
43. Question: Why is one?s breath visible in winter but not in summer?
Answer: In winter, water vapor contained in the breath condenses into small droplets, which become visible but in summer they are quickly evaporated and not seen.
Answer: In winter, water vapor contained in the breath condenses into small droplets, which become visible but in summer they are quickly evaporated and not seen.
44. Question: Why doesn?t the electric filament in an electric bulb burn up?
Answer: Firstly, because is made of tungsten which has a very high melting point (34100C) whereas the temperature of the filament required to glow is only 2700oC. Secondly, oxygen is absent since the bulb is filled with an inert gas which does not help in burning.
Answer: Firstly, because is made of tungsten which has a very high melting point (34100C) whereas the temperature of the filament required to glow is only 2700oC. Secondly, oxygen is absent since the bulb is filled with an inert gas which does not help in burning.
45. Question: Why does blotting paper absorb ink?
Answer: Blotting paperhas fine pores, which act like capillaries. When a portion of blotting paper is brought in contact with ink, ink enters the pores due to surface tension (capillary action f liquids) and is absorbed.
Answer: Blotting paperhas fine pores, which act like capillaries. When a portion of blotting paper is brought in contact with ink, ink enters the pores due to surface tension (capillary action f liquids) and is absorbed.
46. Question: Why does a small iron sink in water but a large ship float?
Answer: The weight of water displaced by an iron ball is less than its own weight, whereas water displaced by the immersed portion of a ship is equal to its weight (Archimedes? Principle).
Answer: The weight of water displaced by an iron ball is less than its own weight, whereas water displaced by the immersed portion of a ship is equal to its weight (Archimedes? Principle).
47. Question: Why does ice float on water?
Answer: The weight of the ice block is equal to the weight of the liquid displaced by the immersed portion of the ice.
Answer: The weight of the ice block is equal to the weight of the liquid displaced by the immersed portion of the ice.
48. Question: Why does moisture gather outside a tumbler containing cold water?
Answer: The water vapour in the air condenses on cooling and appears as droplets of water.
Answer: The water vapour in the air condenses on cooling and appears as droplets of water.
49. Question: Why does kerosene float on water?
Answer: Because the density of kerosene is less than that of water. For the same reason cream rises in milk and floats at the top.
Answer: Because the density of kerosene is less than that of water. For the same reason cream rises in milk and floats at the top.
50. Question: Why is the water in an open pond cool even on a hot summer day?
Answer: As the water evaporates from the open surface of a pond, heat is taken away in the process, leaving the surface cool.
Answer: As the water evaporates from the open surface of a pond, heat is taken away in the process, leaving the surface cool.
Science Questions Answers – Part 1
1. Question: A man with a load jumps from a high building. What will be the load experienced by him?
Answer: Zero, because while falling, both the man and the load are falling at the same acceleration i.e. acceleration due to gravity.
Answer: Zero, because while falling, both the man and the load are falling at the same acceleration i.e. acceleration due to gravity.
2. Question: A piece of chalk when immersed in water emits bubbles. Why?
Answer: Chalk consists of pores forming capillaries. When it is immersed in water, the water begins to rise in the capillaries and air present there is expelled in the form of bubbles.
Answer: Chalk consists of pores forming capillaries. When it is immersed in water, the water begins to rise in the capillaries and air present there is expelled in the form of bubbles.
3. Question: Why does a liquid remain hot or cold for a long time inside a thermos flask?
Answer: The presence of air, a poor conductor of heat, between the double glass wall of a thermos flask, keeps the liquid hot or cold inside a flask for a long time.
4. Question: Why does a ball bounce upon falling?
Answer: When a ball falls, it is temporarily deformed. Because of elasticity, the ball tends to regain its original shape for which it presses the ground and bounces up (Newton’s Third Law of Motion).
5 Question: Why is standing in boats or double decker buses not allowed, particularly in the upper deck of buses?
Answer: On tilting the centre of gravity of the boat or bus is lowered and it is likely to overturn.
6. Question: Why is it recommended to add salt to water while boiling dal?
Answer: By addition of salt, the boiled point of water gets raised which helps in cooking the dal sooner.
7. Question: Why is it the boiling point of sea water more than that of pure water?
Answer: Sea water contains salt, and other impurities which cause an elevation in its boiling point.
8. Question: Why is it easier to spray water to which soap is added?
Answer: Addition of soap decreases the surface tension of water. The energy for spraying is directly proportional to surface tension.
9. Question: Which is more elastic, rubber or steel?
Answer: Steel is more elastic for the same stress produced compared with rubber.
10. Question: Why is the sky blue?
Answer: Violet and blue light have short waves which are scattered more than red light waves. While red light goes almost straight through the atmosphere, blue and violet light are scattered by particles in the atmosphere. Thus, we see a blue sky.
11. Question: Why Does ink leak out of partially filled pen when taken to a higher altitude?
Answer: As we go up, the pressure and density of air goes on decreasing. A Partially filled pen leaks when taken to a higher altitude because the pressure of air acting on the ink inside the tube of the pen is greater than the pressure of the air outside.
12. Question: On the moon, will the weight of a man be less or more than his weight on the earth?
Answer: The gravity of the moon is one-sixth that of the earth; hence the weight of a person on the surface of the moon will be one-sixth of his actual weight on earth.
13. Question: Why do some liquid burn while others do not?
Answer: A liquid burns if its molecules can combine with oxygen in the air with the production of heat. Hence, oil burns but water does not.
14. Question: Why can we see ourselves in a mirror?
Answer: We see objects when light rays from them reach our eyes. As mirrors have a shiny surface, the light rays are reflected back to us and enter our eyes.
15. Question: Why does a solid chunk of iron sink in water but float in mercury?
Answer: Because the density of iron is more than that of water bus less than that of mercury.
16. Question: Why is cooking quicker in a pressure cooker?
Answer: As the pressure inside the cooker increases, the boiling point of water is raised, hence, the cooking process is quicker.
17. Question: When wood burns it crackles. Explain?
Answer: Wood contains a complex mixture of gases and tar forming vapors trapped under its surface. These gases and tar vapors escape, making a cracking sound.
18. Question: Why do stars twinkle?
Answer: The light from a star reaches us after refraction as it passes through various layers of air. When the light passes through the earth?s atmosphere, it is made to flicker by the hot and cold ripples of air and it appears as if the stars are twinkling.
19. Question: Why is it easier to roll a barrel than to pull it?
Answer: Because the rolling force of friction is less than the dynamic force of sliding friction.
20. Question: If a feather, a wooden ball and a steel ball fall simultaneously in a vacuum, which one of these would fall faster?
Answer: All will fall at the same speed in vacuum because there will be no air resistance and the
earth?s gravity will exert a similar gravitational pull on all.
21. Question: When a man fires a gun, he is pushed back slightly. Why?
Answer: As the bullet leaves the nozzle of the gun?s barrel with momentum in a forward direction, as per Newton’s Third Law of Motion, the ejection imparts to the gun as equal momentum in a backward direction.
22. Question: Ice wrapped in a blanket or saw dust does not melt quickly. Why?
Answer: Both wood and wool are bad conductors of heat. They do not permit heat rays to reach the ice easily.
23. Question: Why do we perspire on a hot day?
Answer: When the body temperature rises, the sweat glands are stimulated to secrete perspiration. It is nature’s way to keep the body cool. During the process of evaporation of sweat, body heat is taken away, thus giving a sense of coolness.
24. Question: Why does ice float on water but sink in alcohol?
Answer: Because ice is lighter than water it floats on it. However, ice is heavier than alcohol and therefore it sinks in alcohol.
25. Question: Why do we perspire before rains?
Answer: Before the rain falls, the atmosphere gets saturated with water vapors; as a result, the process of evaporation of sweat is delayed.
List of Different Types of Doctors and What They Do
There are different types of doctors and what they do depends on their field of specialty. If you are a budding doctor and want to know more about the career options related to types of doctors and what they do, then the following article will prove to be a useful read…
Doctor, a profession that elicits respect and high esteem from people from all walks of life. The profession of saving lives, helping new life come into the world and giving new hope to the ill and distraught, is considered to be next to godliness. There are different types of doctors and what they do is to help make life better. All of us have at least once in our lives visited a doctor and the doctor has helped us in some way or the other. Many aspire to become a doctor to help the sick get rid of their maladies. Medicine is one of the most sought after professions in the world and is one of the highest paying jobs in the world. Wouldn’t it feel wonderful to go home with the feeling of satisfaction that you just helped saved a life? If you too are medically inclined and wish to do your bit for society and also have a stable financial future, then becoming a doctor is the way to go! The following list of different types of doctors and what they do will help you learn more about this highly noble medical job.
Different Types of Doctors and What They Do
The world is Mother Nature’s marvel that is blessed with different wonders of the natural world like the human body system. But, with every blessing comes some kind of curse and this curse that plagues the living world is diseases. There are different kinds of diseases and disorders that are either due to microorganisms, parasites, non-functioning of different organs in the body, biochemical imbalances, genetic or hereditary problems, etc. Many times, people suffer from different kinds of accidents natural and man-made, gunshots, stabbing wounds, burns, and many other innovative types of grievous injuries. These different medical problems are taken care of by different types of doctors and what they do, according to their field of specialization. There are hundreds of examples around the world, where doctors have been able to pull men out of the jaws of death with their medical expertise. If you too want to face different medical challenges, then the following list of different types of doctors and what they do, will help you find a foothold in the medical world.
Audiologists: These doctors help patients with different ear problems and help children who are either deaf or mute to learn to communicate.
Allergist: These doctors help in treating different kinds of allergies and immune system disorders like hay fever, asthma, etc.
Andrologists: The andrologist helps in diagnosing and treating disorders related to the male reproductive system.
Anesthesiologists: They study and administer anesthesia and anesthetic medicines that help in facilitating treatment, diagnosis of medical conditions and complete minor and major surgeries without the patient having to feel more than the prick of the anesthetic needle.
Cardiologist: These are doctors of the heart that diagnose and treat heart diseases and cardiovascular diseases.
Dentist: Perhaps one of the most feared doctors of all is the dentist due to their tooth extraction habits! These doctors are concerned with dental health, teeth and dental problems like cavities and bleeding gums. They treat gum diseases, straighten teeth, carry out root canals, etc.
Dermatologists: A dermatologist studies the skin, its structure, functions, and diseases, as well as its appendages (nails, hair, sweat glands) and treats the related ailments.
Endocrinologists: A doctor who studies disorders of the endocrine system and their glands, like thyroid problems and other such hormonal imbalances and the specific secretions of hormones is what entails an endocrinologist job description.
Epidemiologists: Epidemiologist are the doctors who are also known as ‘disease detectives’. They carry out study of diseases and come up with ways of prevention of diseases through vaccinations, etc.
Family Practician: These are your friendly neighborhood doctors who are basically general physicians, and treat patients of all ages & medical non-emergency conditions usually in a clinic.
Gastroenterologists: A doctor that studies diseases of digestive system and gives treatment related to the gasteroenterlogy.
Gynecologists: The doctor who studies and treats diseases of the female reproductive system.
Hematologists: A hematologist studies blood and its diseases.
Hepatologists: Hepatologists study and treat diseases of the liver.
Immunologists: The doctor who studies all aspects of the immune system in all organisms and gives treatment to diseases of the immune system.
Infectious Disease Specialists: The doctors who study & treat diseases that are caused by viruses, bacteria, fungi, parasites, and are usually based within the hospital. These doctors are involved in a lot of research work.
Internal Medicine Specialists: These doctors provide diagnosis, management and nonsurgical treatment of unusual or serious diseases and are usually found working in hospitals as intensivists.
Internists: These doctors focus on adult medicine and have completed a special study related to the prevention and treatment of adult diseases.
Medical Geneticist: A medical geneticist is the doctor that carries out studies, tests, treatments and counseling patients with genetic diseases.
Microbiologists: A microbiologist studies causes, diagnosis and treatment of infectious diseases.
Neonatologist: The neonatologist is the doctor that provides medical care to premature and critically ill newborn babies.
Nephrologist: The doctor who treats kidney diseases and problems.
Neurologist: These are doctors who treat one of the most delicate and important organs of the body, the brain. They treat conditions like seizures, strokes, Parkinson’s, Alzheimer’s, etc.
Neurosurgeons: These are surgeons who treat central and peripheral nervous system diseases that can be cured or controlled to some extent with mechanical intervention.
Obstetrician: This is a part of gynecology and the doctors are experts with childbirth, C-sections, gynecological surgeries like hysterectomy, surgical removal of ovarian tumors, examination of the pelvic region, PAP smears, prenatal care, etc.
Oncologist: An oncologist job description entails treating cancer patients.
Ophthalmologist: The doctor that takes care of eyes and treats various eye problems and performs different eye surgeries.
Orthopedic Surgeons: The doctor who is concerned with the skeletal system of the human body, that is, bones. These doctors make no bones about broken, fractured or arthritis struck bones!
ENT specialists: An ENT specialist treats the Ear, the Nose and the Throat, as well as to some extent some ailments of the head and the neck. This field is also known as otolaryngology.
Perinatologist: The doctor who is an expert in caring and treating high risk pregnancies.
Paleopathologist: These doctors are into the study of ancient diseases.
Parasitologist: The study of parasites, their biology and pathology, as well as the parasitic diseases caused by them is carried out by a parasitologist.
Pathologists: The study of abnormalities in living organisms, diagnosing diseases and conditions from tissue samples like blood or biopsy samples. They also work as medical examiners & carry out autopsies to determine the cause of death. These doctors usually do not come in contact with the patients directly as their work is mostly lab work. They are therefore called as a ‘doctor’s doctor’ as they speak to doctors of the patients rather than the patient himself. There are many doctors who specialize in forensic pathology and help the police and FBI solve crimes.
Pediatricians: A pediatrician is the doctor who studies and treats medical problems of infants, children, and adolescents.
Physiologists: A physiologist is a life science doctor who specializes in physiology.
Physiatrist: The doctor whose specialty is medicine and rehabilitation.
Plastic Surgeon: A plastic surgeon is the doctor who can literally change the life and look of a patient. He performs cosmetic surgery to repair skin and structural problems that may alter the personality of the patient for good.
Podiatrists: The doctor who studies and treats disorders of the foot and ankle.
Psychiatrists: These doctors specialize in psychiatry, that is, a branch of medicine concerned with the study, diagnoses and treatment of mental illness and behavioral disorders.
Pulmonologist: The doctor who diagnoses and treats lung conditions and treatments and even manages critical care patients admitted in the ICU and those that are on ventilator support.
Radiologists: The study of medical use of X-rays or other imaging technologies for diagnoses and treatment of disease is carried out by an radiologist.
Rheumatologsists: These doctors treat allergic conditions & autoimmune disorders.
Surgeons: A surgeon performs operations, related to different sub-specialties of medicine like general surgery, neurosurgery, cardiovascular, cardiothoracic surgery, ENT, maxillo-facial surgery, plastic surgery, oral surgery, transplant surgery, urology, etc.
Urologists: The urologist is a doctor who studies the urinary system and treats urinary tract infections.
Emergency Doctors: Emergency doctors are those who offer their services in the emergency room (ER) and are on call 24/7. They treat various emergency cases that vary from poisoning, broken bones, burns, heart attack, and anything and everything that can be termed as a medical emergency.
Veterinarian: Although, all the above fields are concerned with human treatment, the veterinarian is also a type of doctor and what they do is treat animals. They take care of different diseases of the animal world. There are different kinds of doctors within the field of animal medicine and like human doctors, the veterinarian too has his field of expertise in case of animal problems.
This was some medical career information related to different types of doctors and what they do. There are over 50 to 60 specialties of medicine and each specialty with different types of doctors and their salaries. You need to understand your area of interest and then choose your line of specialty as a career. I hope this article on different types of doctors and what they do has helped you find your field of interest.
DISCOVERY / INVENTION IN MEDICAL SCIENCE
SNo | Discovery / Invention | Year | Discoverer / Inventor | Country |
1 | Adrenaline | 1894 | Schafer and Oliver | Britain |
2 | Anesthesia, Local | 1885 | Koller | Austria |
3 | Anesthesia, Spinal | 1898 | Bier | Germany |
4 | Anti-toxins (Science of Immunity) | 1890 | Behring and Kitasato | Germany, Japan |
5 | Aspirin | 1889 | Dreser | Germany |
6 | Ayurveda | 2000-1000 BC | India | |
7 | Bacteria | 1683 | Leeuwenhock | Netherlands |
8 | Bacteriology | 1872 | Ferdinand Cohn | Germany |
9 | Biochemistry | 1648 | Jan Baptista Van Helmont | Belgium |
10 | Blood Plasma storage (Blood bank) | 1940 | Drew | U.S.A |
11 | Blood Transfusion | 1625 | Jean-Baptiste Denys | France |
12 | Cardiac Pacemaker | 1932 | A.S Hyman | U.S.A |
13 | CAT Scanner | 1968 | Godfrey Hounsfield | Britain |
14 | Chemotherapy | 1493-1541 | Paracelsus | Switzerland |
15 | Chloroform as anaesthetic | 1847 | James Simpson | Britain |
16 | Chloromycetin | 1947 | Burkholder | U.S.A |
17 | Cholera T.B germs | 1877 | Robert Koch | Germany |
18 | Circulation of blood | 1628 | William Harvey | Britain |
19 | Cryo-Surgery | 1953 | Henry Swan | U.S.A |
20 | Diphtheria germs | 1883-84 | Klebs and Loffler | Germany |
21 | Electro-Cardiograph | 1903 | Willem Einthoven | Netherlands |
22 | Electro-encephalogram | 1929 | Hand Berger | Germany |
23 | Embryology | 1792-1896 | Kari Ernest Van Baer | Estonia |
24 | Endocrinology | 1902 | Bayliss and Starling | Britain |
25 | First Test Tube Baby | 1978 | Steptoe and Edwards | Britain |
26 | Gene Therapy on humans | 1980 | Martin Clive | U.S.A |
27 | Genes associated with cancer | 1982 | Robert Weinberg and others | U.S.A |
28 | Heart Transplant Surgery | 1967 | Christian Barnard | S. Africa |
29 | Histology | 1771-1802 | Marie Bichat | France |
30 | Hypodermic syringe | 1853 | Alexander wood | Britain |
31 | Kidney Machine | 1944 | Kolf | Netherlands |
32 | Leprosy Bacillus | 1873 | Hansen | Norway |
33 | LSD (Lysergic acid diethylamide) | 1943 | Hoffman | Switzerland |
34 | Malaria Germs | 1880 | Laveran | France |
35 | Morphine | 1805 | Friderich Sertumer | Germany |
36 | Neurology | 1758-1828 | Franz Joseph Gall | Germany |
37 | Nuclear magnetic resonance imaging | 1971 | Raymond Damadian | U.S.A |
38 | Open Heart Surgery | 1953 | Walton Lillehel | U.S.A |
39 | Oral Contraceptive Pills | 1955 | Gregory Pincus, Rock | U.S.A |
40 | Penicillin | 1928 | Alexander Fleming | Britain |
41 | Physiology | 1757-66 | Albrecht Von Haller | Switzerland |
42 | Positron emission Tomography | 1978 | Louis Sokoloff | U.S.A |
43 | Rabies Vaccine | 1860 | Louis Pasteur | France |
44 | Recombinant-DNA technology | 1972-73 | Paul Berg, H.W. Boyer,S Cohen | U.S.A |
45 | Reserpine | 1949 | Jal Vakil | India |
46 | Rh-factor | 1940 | Karl Landsteiner | U.S.A |
47 | Serology | 1884-1915 | Paul Ehrlich | Germany |
48 | Sex hormones | 1910 | Eugen Steinach | Australia |
49 | Small Pox eradicated | 1980 | W.H.O Declaration | UN |
50 | Stethoscope | 1819 | Rene Laennec | France |
51 | Streptomycin | 1944 | Selman Waksmann | U.S.A |
52 | Synthetic Antigens | 1917 | Landsteiner | U.S.A |
53 | Terramycin | 1950 | Finlay and Others | U.S.A |
54 | Thyroxin | 1919 | Edward Calvin-Kendall | U.S.A |
55 | Typhus Vaccine | 1909 | J. Nicolle | France |
56 | Vaccination | 1796 | Edward Jenner | Britain |
57 | Vaccine, Measles | 1963 | Enders | U.S.A |
58 | Vaccine, Meningitis | 1987 | Gardon, et al. Connaught Lab | U.S.A |
59 | Vaccine, Polio | 1954 | Jonas Salk | U.S.A |
60 | Vaccine, Polio-orai | 1960 | Albert Sabin | U.S.A |
61 | Vaccine, Rabies | 1885 | Louis Pasteur | France |
62 | Vaccine, Smallpox | 1776 | Jenner | Britain |
63 | Virology | 1892 | Ivanovski and Bajernick | USSR, Netherlands |
64 | Vitamin A | 1913 | Mc Collum and M. Davis | U.S.A |
65 | Vitamin B1 | 1936 | Minot and Murphy | U.S.A |
66 | Vitamin C | 1919 | Froelich Holst | Norway |
67 | Vitamin D | 1925 | Mc Collum | U.S.A |
68 | Vitamin K | 1938 | Doisy Dam | U.S.A |
69 | Western Scientific Therapy | 460-370 BC | Hippocrates | Greece |
70 | Yoga | 200-100 BC | Patanjali | India |
Some Quick Science GK
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November 27, 2018
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