Expected MCQs in CSS 2026 Exam

General Science

1. Chemical composition of laughing gas is: Nitrogen + Oxygen

2. Light year is related to: Distance

3. LPG consists of: Butane and Propane

4. Arteries become hard due to deposition of: Fats

5. The science of study of old age is called: Gerontology

6. The instrument used for measuring the velocity of air is: Anemometer

7. The science which deals with the birds is called: Ornithology

8. The function of the thermostat in a refrigerator is to maintain: Temperature

9. Brass is an alloy of copper and: Zinc

10. Bronze is an alloy of copper and: Tin

11. Ibn Baitar was a renowned Muslim: Botanist

12. English physician who pioneered vaccination is: Edward Jenner

13. Quartz is chemically a: Silicate

14. The particles with positive charge but having mass equal to that of electron are called: Protons

15. Iron corrodes due to the formation of: Iron Oxide

16. Voltmeter is used to measure: Voltage

17. Starch is a polymer of: Glucose

18. The process of conversion of a material from solid state directly to gaseous state is called: Sublimation

19. Ruby is an oxide of: Aluminum

20. Kitab al-Manazir is a publication by a famous Muslim scientist about: Optics

21. The essential elements of bones are Calcium and: Phosphorus

22. The organ in human body that controls the amount of water and salt in blood is: Kidneys

23. Frequency of audible sound in Hertz (Hz) is: 20-20,000Hz

24. Cheapest source of producing electricity is: Water

25. The smallest unit of measurement of wavelength is: Angstrom

26. Spinach is a good source of vitamin: K

27. Insulin is a hormone secreted by the: Pancreas

28. The process named after the French chemist Louis Pasteur is: Pasteurization

29. Newton is the unit of: Force

30. The memory of the computer is expressed in: Bytes

31. Calcium Sulfate is the chemical name of: Gypsum

32. The medical condition of having an unusually low level of sugar in the blood is: Hypoglycemia

33. The purest form of commercial iron is: Wrought iron

34. Circular aperture which appears as a dark spot in the eye is called: Pupil

35. The scientist often credited with the introduction of the Theory of Evolution is: Charles Darwin

36. Haemophiia is caused by the deficiency of vitamin: K

37. Light moves at a velocity of about: 300,000 km per second

38. The glands which pour their secretions directly into the blood stream are: Endocrine Glands

39. To clean the ice from the roads during winter season, we use: Salt

40. The planet that moves slowest around the Sun is: Venus

41. The waves used by the TV remote control are: Infrared waves

42. Electromagnetic waves, which are used for satellite communication, are: Radio waves and Microwaves

43. The mass of a neutron star compared to the mass of the Sun is: 2.35 times greater

44. The material that is used to make LEDs is: Silicon & Gallium arsenide

45. A dark cloud of great vertical extent charged with electricity is: Cumulonimbus cloud

46. A Nematode is a: Worm

47. The rock of which marble is a type is: Metamorphic

48. The synoptic weather charts are used to: Predict the weather

49. Brains of the computer is: CPU (central processing unit)

50. The phenomenon which makes image formation possible by the eye as well as by cameras is: Refraction

51. The plastics that can be repeatedly softened by heating and hardened by cooling are: Thermoplastics

52. The plastics that harden permanently after being heated once are: Thermosetting plastics

53. Biological catalysts that have multiple function in the body are: Enzymes

54. The branch of zoology which deals with the study of insects is called: Entomology

55. Penicillin was discovered by: Alexander Fleming

56. Medulla Oblongata connects the small brain with: Spinal Chord

57. The smallest unit of information on a machine is: Bit

58. One megabytes equals: 1,048,576 bytes

59. The most common type of memory found in computers is: RAM (random access memory)

60. A chemical process in which glucose is broken down is: Glycolysis

61. Evaporation of water particles from plant surfaces is: Transpiration

62. The sheet of muscles that separates the chest from the abdomen is: Diaphragm

63. The living part of a plant cell is composed of a nucleus and: Cytoplasm

64. Anvil and stirrup are names of bones present in the: Ear

65. The smallest branches of an artery lead into tiny blood vessels called: Capillaries

66. Dyne is a unit of: Force

67. Calorie is a unit of: Heat

68. The atmospheric pressure decreases as the altitude: Increases

69. In an animal cell, protein is synthesized in the: Ribosome

70. Chemically, finger nails are made up of: Protein

71. Animals which obtain their food from dead organisms are called: Scavengers

72. Rickets is caused by the deficiency of vitamin: D

73. Sound is a form of: Energy

74. An arc of coloured light in the sky caused by refraction of the sun's rays by rain is: Rainbow

75. Tissues that surround the brain or spinal cord are: Meninges

76. The inventor of cement is: Joseph Aspdin

77. Becquerel is the unit of: Radioactivity

78. The science which deals with heredity is known as: Genetics

79. The study of chemical processes of living organisms is called: Biochemistry

80. Muscular blood vessels that carry blood away from the heart are: Arteries

81. Blood vessels that carry blood toward the heart are: Veins

82. The branch of science concerned with forces acting on or exerted by fluids is: Hydrodynamics

83. The lines on a weather map or chart that connects areas of equal barometric pressure are: Isobars

84. Removal and study of a tissue sample for diagnostic purposes is called: Biopsy

85. The Hubble Space Telescope was named after: Edwin Hubble

86. The ozone layer was discovered in 1913 by the French physicists Charles Fabry and: Henri Buisson

87. The scientists who established a worldwide network of ozone monitoring stations was: G. M. B. Dobson

88. CFCs (chlorofluorocarbons) were discovered in the 1930s by American chemist: Thomas Midgley

89. The ozone layer hole was discovered over Antarctica in: 1984

90. The study of life in outer space is known as: Exobiology

91. Sensitive layer of the eye is: Retina

92. The instrument which measures very high temperature is: Pyrometer

93. The science which deals with the study of manners and customs of people is: Ethnology

94. Chemical used to kill rats and mice are: Rodenticides

95. Dilute acetic acid is the chemical name of: Vinegar

96. Hygrometer is used for measuring the: Humidity of air

97. The study of methods of improving genetic qualities by selective breeding is: Eugenics

98. The position of earth in its orbit, when it is at its greatest distance from the sun causing northern summer is called: Aphelion

99. Kilowatt-hour is a unit of: Energy

100. Atmospheric layer that help in radio communication is: Ionosphere

101. The gas essential for breathing is: Oxygen

102. The hardest natural substance is: Diamond

103. The fastest planet in orbit is: Mercury

104. The planet closest to the Sun is: Mercury

105. The energy stored in food is: Chemical energy

106. The SI unit of temperature is: Kelvin

107. The study of stars is called: Astronomy

108. Sunlight is a major source of Vitamin: D

109. The metal that is liquid at room temperature is: Mercury

110. The smallest particle of matter is: Atom

111. The basic unit of elements is: Atom

112. Sound cannot travel through: Vacuum

113. Gravity was discovered by: Newton

114. The number of bones in human body is: 206

115. The power of a lens is measured in: Diopters

116. The SI Unit for focal strength is: Diopter

117. The process by which plants release oxygen is: Photosynthesis

118. The Earth's outermost layer is: Crust

119. The fastest animal on land is: Cheetah

120. Human blood is red due to: Hemoglobin

121. The basic unit of life is: Cell

122. The human organ that filters blood is: Kidney

123. The planet known as Red Planet is: Mars

124. The color of Mars is red due to the presence of: Iron oxide

125. Vitamin C is also called: Ascorbic acid

126. The gas that forms about 78% of atmosphere is: Nitrogen

127. A device that converts chemical energy into electrical energy is: Battery

128. Human bones are made of: Calcium

129. The largest internal organ of human body is: Liver

130. The unit of electric resistance is: Ohm

131. The energy of motion is called: Kinetic energy

132. The organ controlling hormones is: Endocrine glands

133. The lightest gas is: Hydrogen

134. Au is the chemical symbol of: Gold

135. The unit of electric current is: Ampere

136. The device used to measures earthquakes is: Seismograph

137. The gas used in balloons is: Helium

138. The SI unit of force is: Newton

139. The gas that protects us from harmful UV rays is: Ozone

140. The pH of pure water is: 7

141. The gas produced during photosynthesis is: Oxygen

142. The SI unit of energy is: Joule

143. The planet known as the Gas Giant is: Jupiter

144. The human organ that secretes bile is: Liver

145. The force keeping planets in orbit is: Gravity

146. The metal used in electrical wiring is: Copper

147. The chemical symbol of iron is: Fe

148. The device used to measure atmospheric pressure is: Barometer

149. The planet of our solar system known as the morning star is: Venus

150. Fear of trees is called: Dendrophobia

151. Gregor Mendel is known as the father of: Genetics

152. Charles Babbage is famous for his work in: Computer

153. The scientist who discovered water was: Antoine Lavoisier

154. The SI unit of pressure is: Pascal

155. The longest bone in the human body is: Femur

156. The shortest bone in human body is: Stapes

157. The part of the donor's eye utilized in eye donation is: Cornea

158. Retina is the sensitive layer of: Eye

159. The Sun is a: Star

160. The blood in the human body is formed in: Bone Marrow

161. Nephrology is the branch of medicine concerned with the study and treatment of: Kidney disorders

162. Myopia (nearsightedness) is corrected using: Concave lens

163. The lifespan of white blood cells ranges from: 13 to 20 days

164. Neutron was discovered in 1932 by: James Chadwick

165. Decibel (dB) is the unit used to measure: Intensity of sound pressure

166. The planet that moves slowest around the Sun is: Neptune

167. The life span of red blood cells in humans is: 120 days

168. Vitamin A deficiency causes: Night blindness

169. The instrument used to measure the oxygen level of the blood is: Pulse oximeter

170. The instrument used to measure the blood pressure is: Sphygmomanometer

171. Circulation of blood was discovered by: William Harvey

172. Part of atmosphere in which we live is: Troposphere

173. Blood carries oxygen with the help of: Hemoglobin

174. The type of energy stored in a stretched spring is: Potential energy

175. The formula of table salt is: NaCl

176. The smallest particle of an element is: Atom

177. The nearest galaxy to Earth is: Andromeda

178. The human brain is protected by the: Skull

179. The study of fossils is known as: Paleontology

180. The primary gas in the sun is: Hydrogen

181. Light travels fastest in: Vacuum

182. The main component of glass is: Silica

183. The strongest muscle in the human body is: Jaw muscle (Masseter)

184. Blood is pumped by the: Heart

185. The phenomenon of Aurora Borealis, the display of red and green lights in northern hemisphere, is due to radiations from: Ionosphere

186. 'Blue dwarfs' and 'Red giants' respectively refer to: Young star and Old star

187. The source of energy that is caused by uneven heating of earth's surface is: Wind

188. Global winds towards western direction are known as: Trade winds

189. Perinatal transmission is said to occur when a pathogen is transmitted from: Mother to infant

190. The plant group that needs both land and water to complete their life cycle is: Bryophyta

191. Maximum amount of carbohydrates are obtained from: Whole grain food

192. All operating systems get their total memory initialized from: BIOS

193. The amount of data transmitted for a given amount of time is called: Bandwidth

194. In the structure of fiber, the light is guided through the core due to total internal: Reflection

195. The inventor of Artificial Intelligence is: John McCarthy

196. Cement factory labourers are prone to: Cytosilicosis

197. The fastest enzyme is: Carbonic anhydrase

198. Process of adding vitamins to milk is known as: Fortification

199. The waves which are used for line of sight (LOS) communication are called: Space waves

200. The fruits without seed, like banana, are called: Parthenocarpic

201. Animal which captures and readily kills living animals for its food is called: Predator

202. The famous book of Ibn-Sina in which he discussed human physiology and medicine is: Al-Qanoon

203. Water containing a high concentration of minerals and calcium is: Hard water

204. The phenomenon of an element existing in two or more physical forms is: Allotropy

205. Blood group is determined by: Antigens

206. Bauxite is one of the ores of: Aluminium

207. The chemical name of washing soda is: Sodium Carbonate

208. The main constituent of Sui gas is: Methane

209. Monomers of protein are: Amino Acids

210. An apparatus used for measuring the pressure of gases is: Manometer

211. The mirror used in vehicles is: Convex mirror

212. Hot springs which erupt hot water and steam from time to time are: Geysers

213. Hot liquid rock beneath the earth's surface is called: Magma

214. The first simply microscope was invented by: Robert Hook

215. The power house of the cell is: Mitochondria

216. Computer works on the principle introduced by the Muslim scientist: Al Khawarzmi

217. Coldest planet of the solar system is: Neptune

218. Muslim Scientist Ali ibn Al Tabari is famous for his work on: Medicine

219. The instrument used to measure degree of humidity is: Hygrometer

220. The gland responsible for the secretion of the hormone estrogen is: Ovary

221. The metal used in thermometers is: Mercury

222. The first spacecraft to visit Mars was Mariner 4 in: 1965

223. The nuclear reaction taking place on the surface of sun is: Fusion reaction

224. Toxic chemicals that are used to destroy pests are known as: Pesticides

225. The science of sound dealing with the production, effects, and transmission of sound waves through various mediums is: Acoustics

226. The release of an egg (or eggs) from the ovary is called: Ovulation

227. The vitamin that helps in vision is: Vitamin A

228. The center of an atom is: Nucleus

229. The main function of red blood cells is: Oxygen transport

230. The device used to see distant objects is: Telescope

231. The chemical symbol of potassium is: K

232. The largest organ of the human body is: Skin

233. The force that opposes motion is: Friction

234. The basic unit of life is: Cell

235. The main source of energy for Earth is: Sun

236. The chemical symbol of sodium is: Na

237. The unit of power is: Watt

238. The vitamin that strengthens bones is: Vitamin D

239. The hardest part of the human body is: Tooth enamel

240. The study of weather is called: Meteorology

241. The largest gland in the body is: Liver

242. The bending of light is called: Refraction

243. The strongest acid is: Hydrochloric acid

244. The speed of sound is measured in: m/s

245. The color of chlorophyll is: Green

246. An instrument to see tiny objects is: Microscope

247. The boiling point of water in Fahrenheit is: 212°F

248. Sound is produced by: Vibrations

249. Ice floats on water because of: Lower density

250. The SI unit of force is: Newton

251. Electricity flows through: Conductors

252. The human body's main energy source is: Carbohydrates

253. The blood cells that fight infection are: White blood cells

254. The lens in the human eye focuses light on the: Retina

255. Stainless steel is an alloy of iron and: Chromium

256. The device that converts sound into electrical signals is: Microphone

257. Milk turns sour due to: Bacteria

258. The part of the atom with a positive charge is: Proton

259. The troposphere extends up to about: 16 km

260. The region beyond the ionosphere is called: Exosphere

261. Air pressure is measured by a barometer and is expressed in: Torrs

262. Normal atmospheric pressure at sea level is: 760 torrs

263. The conversion of non-diffusible substances into diffusible ones by the action of enzymes in called: Digestion

264. Curie is a unit of: Radioactivity

265. The brown colour of rust is because of: Oxidation

266. The main chemical substance in the plant cell wall is: Cellulose

267. Cell was first discovered by: Robert Brown

268. The adrenal glands are located on top of: Kidneys

269. Natural ultraviolet radiation comes from: Sun

270. The gene for normal colour vision is found on the: X-chromosome

271. The wires that can carry currents with zero losses up to very high current densities are: Superconducting wires

272. A measuring instrument for detecting and measuring the intensity and direction and duration of earthquakes is: Seismograph

273. The largest known dwarf planet in the solar system by mass is: Eris

274. The mixture that can dissolve platinium is: Aqua regia

275. The constituent elements of Bronze are: Tin and Copper

276. The electrical device which transform voltage is: Transformer

277. The instrument used for measuring humidity is: Hygrometer

278. The element used as a fuel for nuclear reactors is: Uranium

279. Aqua regia is a 3:1 mixture of hydrochloric acid and: Nitric acid

280. Fibre optics cable carries data in the form of: Light

281. An instrument that measures the height above ground in navigation is: Altimeter

282. Feathers covering the body of birds are called: Plumage

283. Halos around the moon are formed because of the phenomenon of: Dispersion of light

284. Muscle stiffness is caused by a disease called: Tatnus

285. The image of a tree looks inverted on the bank of a lake die to the law of: Reflection

286. Influenza is caused by: Virus

287. Geothermal energy is energy from heat inside the: Earth

288. The sound with a frequency greater than the upper limit of human hearing, approximately 20 kilohertz is called: Ultrasound

289. The device used to measure radioactivity is: Geiger counter

290. The scientist who designed the first internal combustion engine used to burn low grade fuel was: Francois Isaac de Rivaz

291. The scientist who asserted the earth to be a huge magnet was: William Gilbert

292. The metal also known as quick silver is: Mercury

293. The gas responsible for rusting is: Oxygen

294. The most abundant gas in air is: Nitrogen

295. The process of water turning into vapor is: Evaporation

296. The chemical used to purify drinking water is: Chlorine

297. The energy produced by moving objects is: Kinetic energy

298. The decomposition of food in the stomach is caused by: Hydrochloric acid

299. Parsec is a unit of: Astronomical length

300. The first person to orbit the earth in space was: Yuri Gagarin