Top Science GK Questions and Answers with PDF Download
"Discover a collection of Science General Knowledge (GK) questions and answers, available for free PDF download. Ideal for students preparing for competitive exams, our resource covers various science topics including physics, chemistry, and biology. Download the PDF and study at your convenience to strengthen your exam preparation and boost your scores. A must-have study guide for science enthusiasts!"
"Top Science GK Questions and Answers with PDF Download for Competitive Exams"
[Most Important Science GK Questions And Answers]
1. What is the chemical symbol for gold?
Au
2. What is the most common gas in Earth's atmosphere?
Nitrogen (N2)
3. What is the powerhouse of the cell?
Mitochondria
4. What is the boiling point of water at sea level in Celsius?
100°C
5. Who developed the theory of relativity?
Albert Einstein
6. What is the most abundant element in the universe?
Hydrogen
7. What is the chemical formula of water?
H2O
8. Which planet is known as the "Red Planet"?
Mars
9. What is the hardest natural substance on Earth?
Diamond
10. What gas do plants absorb from the atmosphere during photosynthesis?
Carbon dioxide (CO2)
11. What is the chemical symbol for water?
H2O
12. Who is known as the father of modern physics?
Albert Einstein
13. What is the unit of force?
Newton (N)
14. What element does "O" represent on the periodic table?
Oxygen
15. What is the center of an atom called?
Nucleus
16. What is the chemical formula for methane?
CH4
17. Which planet has the most moons?
Jupiter
18. What is the smallest bone in the human body?
The stapes (in the ear)
19. Who is credited with the discovery of penicillin?
Alexander Fleming
20. What is the chemical symbol for sodium?
Na
21. What is the chemical symbol for silver?
Ag
22. What is the longest bone in the human body?
Femur
23. Which planet is known as the "Morning Star"?
Venus
24. What is the most abundant element in the Earth's crust?
Oxygen
25. What is the name of the largest moon of Saturn?
Titan
26. Who is credited with discovering the circulation of blood?
William Harvey
27. What gas makes up about 21% of Earth's atmosphere?
Oxygen
28. What is the most common element in the human body?
Oxygen
29. What is the main function of red blood cells?
To carry oxygen throughout the body
30. What is the chemical formula of carbon dioxide?
CO2
31. What is the name of the frst artifcial satellite?
Sputnik 1
32. What is the center of the solar system?
The Sun
33. Which element is represented by the symbol "Na" on the periodic table?
Sodium
34. Which planet is the largest in our solar system?
Jupiter
35. What is the process by which plants make their food?
Photosynthesis
36. What is the only planet in our solar system that rotates on its side?
Uranus
37. What is the name of the largest ocean on Earth?
Pacifc Ocean
38. What is the most common type of cancer in men?
Prostate cancer
39. What is the name of the process by which a liquid changes into a gas?
Evaporation
40. What is the smallest planet in our solar system?
Mercury
41. What is the chemical symbol for potassium?
K
42. What is the process of converting solid into liquid called?
Melting
43. What is the most famous law of motion formulated by Isaac Newton?
Newton's Third Law of Motion
44. What is the name of the longest river in the world?
The Nile
45. What is the most abundant metal in Earth's crust?
Aluminum
46. What is the process by which plants lose water through their leaves?
Transpiration
47. What is the speed of light in a vacuum?
299,792,458 meters per second
48. Which gas is responsible for the greenhouse effect?
Carbon dioxide (CO2)
49. What is the largest land mammal?
African elephant
50. What part of the brain controls breathing?
Medulla oblongata
51. What is the name of the famous theory developed by Charles Darwin?
The Theory of Evolution
52. Which element is represented by the symbol "Fe" on the periodic table?
Iron
53. What is the most common element in the universe?
Hydrogen
54. What organ in the human body produces insulin?
Pancreas
55. What is the name of the phenomenon where light bends as it passes through different materials?
Refraction
56. Which planet has the longest day?
Venus
57. What is the most abundant type of star in the Milky Way galaxy?
Red dwarf stars
58. What is the main function of white blood cells?
To fght infections
59. What is the strongest muscle in the human body based on its size?
The masseter (jaw muscle)
60. What is the chemical symbol for mercury?
Hg
61. Which planet is known as the "Giant Planet"?
Jupiter
62. What is the name of the process by which plants make their food using sunlight?
Photosynthesis
63. What is the largest mammal on Earth?
Blue whale
64. What is the chemical formula for glucose?
C6H12O6
65. What is the name of the longest bone in the human body?
Femur
66. Which element has the highest melting point?
Tungsten (W)
67. What type of animal is a Komodo dragon?
Lizard
68. What is the name of the frst human to journey into outer space?
Yuri Gagarin
69. What is the main function of the kidneys in humans?
To flter waste products from the blood
70. What is the most abundant gas in Earth's atmosphere?
Nitrogen
71. What is the center of the human circulatory system?
Heart
72. Which force keeps the planets in orbit around the Sun?
Gravity
73. What is the name of the theory that describes how the universe began?
The Big Bang Theory
74. What is the most common type of rock on Earth?
Igneous rock
75. What is the name of the chemical element with the symbol "O"?
Oxygen
76. Which animal is known as the king of the jungle?
Lion
77. What part of the brain controls voluntary movement?
Cerebrum
78. What is the name of the force that causes objects to fall toward the Earth?
Gravity
79. What is the chemical symbol for lead?
Pb
80. Which planet is known as the "Earth's twin" due to its similar size and composition?
Venus
81. What is the chemical formula for ammonia?
NH3
82. What is the hardest known natural material?
Diamond
83. What is the term for the process of water vapor turning into liquid water?
Condensation
84. What is the name of the nearest star to Earth after the Sun?
Proxima Centauri
85. What is the process by which living organisms convert food into energy?
Respiration
86. What is the name of the gas that makes up most of the Sun's composition?
Hydrogen
87. What is the largest species of shark?
Whale shark
88. What is the most common blood type in humans?
O+
89. What is the part of the human eye responsible for detecting light and color?
Retina
90. What is the name of the chemical reaction where an atom loses an electron?
Oxidation
91. What is the name of the frst living organism to be sent into space?
Laika (a dog)
92. Which gas do humans exhale after breathing in oxygen?
Carbon dioxide
93. What is the term for the study of fungi?
Mycology
94. What is the name of the process that makes plant cells green?
Chlorophyll synthesis
95. What is the name of the space telescope launched in 1990 that provided detailed images of distant galaxies?
Hubble Space Telescope
96. What element has the atomic number 1?
Hydrogen
97. What is the force that opposes the motion of objects through a fuid?
Drag
98. What is the name of the process where plants release water vapor into the atmosphere?
Transpiration
99. What is the largest planet in our solar system?
Jupiter
100. What is the name of the galaxy that contains our solar system?
Milky Way
101. What type of energy is stored in food?
Chemical energy
102. What is the name of the protein that helps transport oxygen in the blood?
Hemoglobin
103. What is the name of the only planet in our solar system that rotates clockwise?
Venus
104. Which part of the human body is responsible for regulating temperature?
Hypothalamus
105. What is the name of the process by which plants convert sunlight into energy?
Photosynthesis
106. What is the element with the atomic number 8?
Oxygen
107. What is the name of the phenomenon that causes rainbows?
Refraction and dispersion of light
108. What is the most common type of rock found on Earth's surface?
Igneous rock
109. Which element is essential for the formation of bones and teeth in humans?
Calcium
110. What is the name of the protective outer layer of the Earth that includes continents and ocean foors?
Crust
111. What is the name of the first human mission to land on the Moon?
Apollo 11
112. Which part of the body controls balance and coordination?
Cerebellum
113. What is the primary function of the heart in the human body?
Pump blood throughout the body
114. What is the name of the scientist who formulated the theory of gravity?
Isaac Newton
115. What is the primary gas in Earth's atmosphere?
Nitrogen
116. What is the process by which a caterpillar turns into a butterfy?
Metamorphosis
117. What is the name of the instrument used to measure temperature?
Thermometer
118. What is the most common element in the Earth's crust?
Oxygen
119. Which human organ is responsible for detoxifying chemicals and metabolizing drugs?
Liver
120. What is the largest internal organ in the human body?
Liver
121. What is the hottest planet in our solar system?
Venus
122. What is the name of the process that plants use to absorb water from the soil?
Absorption
123. What is the name of the force that pulls objects toward the Earth?
Gravity
124. What is the study of the structure of the human body called?
Anatomy
125. What is the main ingredient in the air we breathe?
Nitrogen
126. What type of organism is the yeast used in baking?
Fungus
127. What is the name of the process by which water changes from liquid to gas?
Evaporation
128. Which gas makes up about 21% of the Earth's atmosphere?
Oxygen
129. What is the name of the force that resists the motion of objects through a fluid?
Drag
130. What is the study of planets, stars, and other celestial bodies called?
Astronomy
131. Which part of the cell is responsible for controlling the activities of the cell?
Nucleus
132. What is the name of the largest volcano in the solar system?
Olympus Mons
133. What type of animal is a jellyfsh?
Invertebrate
134. Which planet is known for its beautiful rings?
Saturn
135. What element is needed for photosynthesis in plants?
Chlorophyll
136. What is the second most abundant gas in Earth's atmosphere?
Oxygen
137. What part of the body produces insulin?
Pancreas
138. What is the name of the frst woman to travel to space?
Valentina Tereshkova
139. What is the name of the closest star to Earth after the Sun?
Proxima Centauri
140. What is the unit of measurement for electric current?
Ampere
141. Which scientist is known for developing the theory of evolution by natural selection?
Charles Darwin
142. What part of the human body is responsible for pumping blood?
Heart
143. What is the process by which a solid turns directly into a gas?
Sublimation
144. Which part of the plant is responsible for photosynthesis?
Leaf
145. What is the smallest unit of life?
Cell
146. What is the process of changing a liquid to a solid called?
Freezing
147. What is the chemical symbol for iron?
Fe
148. What type of cloud is responsible for thunderstorms?
Cumulonimbus
149. What is the name of the pigment that gives plants their green color?
Chlorophyll
150. What is the largest species of whale?
Blue whale
151. What is the name of the process by which the body breaks down food into smaller molecules?
Digestion
152. What is the name of the outermost layer of the Earth?
Crust
153. What is the name of the smallest planet in the solar system?
Mercury
154. What is the term for a change in the DNA sequence of a gene?
Mutation
155. What is the primary function of red blood cells?
Carry oxygen
156. What is the term for the study of the weather?
Meteorology
157. What is the most abundant gas in the Earth's atmosphere?
Nitrogen
158. Which element is the main component of natural gas?
Methane
159. What type of bond holds two hydrogen atoms together in a molecule of hydrogen gas?
Covalent bond
160. Which planet is the hottest in the solar system?
Venus
161. What type of organism is responsible for causing malaria?
Plasmodium (a parasite)
162. What is the name of the force that opposes motion between two surfaces in contact?
Friction
163. What is the name of the process by which water moves through plants?
Transpiration
164. What is the name of the scientist who developed the laws of motion and gravity?
Isaac Newton
165. What is the most abundant mineral in the Earth's crust?
Feldspar
166. What is the most common element in the Earth's atmosphere?
Nitrogen
167. What part of the cell contains the genetic material?
Nucleus
168. What is the study of heredity and the variation of inherited characteristics called?
Genetics
169. What is the chemical formula for water?
H2O
170. What is the name of the nearest galaxy to the Milky Way?
Andromeda
171. Which planet is known as the "Morning Star" or "Evening Star"?
Venus
172. What is the name of the scientist who discovered penicillin?
Alexander Fleming
173. What is the unit of electric resistance?
Ohm
174. What is the name of the largest desert in the world?
Sahara Desert
175. What is the primary source of energy for the Earth?
The Sun
176. What is the name of the process by which cells make copies of themselves?
Cell division (Mitosis)
177. What is the name of the force that holds the nucleus of an atom together?
Nuclear force
178. What is the largest living organism on Earth?
Honey fungus (Armillaria ostoyae)
179. What is the process of changing a liquid into a gas called?
Evaporation
180. What type of rock forms from lava and volcanic activity?
Igneous rock
181. What part of the brain controls voluntary movement and motor skills?
Cerebrum
182. Which gas do humans exhale during respiration?
Carbon dioxide
183. What is the name of the theory that explains the movement of the Earth's tectonic plates?
Plate tectonics
184. What is the chemical formula for carbon dioxide?
CO2
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