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Summary. Expected MCQs in CSS 2026 Exam
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
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