Master General Science: 500+
Solved MCQs for Global Government Exams (Latest Edition)
Are you preparing for high-stakes international government exams or civil service recruitment? General Science remains one of the most critical sections for candidates worldwide, covering essential concepts in Physics, Chemistry, and Biology.
In this General Science GK Set 10, we have
curated 500 high-yield, SEO-optimized Multiple Choice Questions (MCQs) with
accurate answers to help you ace your preparation. Whether you are appearing
for UPSC, SSC, UK Civil Services, or any international administrative test,
these questions are designed to mirror the latest global exam patterns. From
fundamental scientific laws to advanced physiological breakthroughs, this guide
provides a one-stop resource to boost your score and sharpen your competitive edge.
Start your journey toward a government
career today with our definitive Science GK series!
General Science GK Set 10: 500 Questions & Answers
1. Which gas is most abundant in the Earth's atmosphere? Answer: Nitrogen
(approx. 78%).
2.
What is the chemical name for common table salt? Answer: Sodium
Chloride ($NaCl$).
3.
Which planet is known as the "Red Planet"? Answer: Mars.
4.
What is the SI unit of electric current? Answer: Ampere.
5.
Which part of the human brain controls balance and posture? Answer: Cerebellum.
6.
The process of plants making their own food is called: Answer: Photosynthesis.
7.
Which vitamin is synthesized in the human body in the
presence of sunlight? Answer: Vitamin
D.
8.
What is the hardest natural substance found on Earth? Answer: Diamond.
9.
Which gas is used in fire extinguishers? Answer: Carbon
Dioxide ($CO_2$).
10. The study of fungi is known as: Answer: Mycology.
11. Which instrument is used to measure
atmospheric pressure? Answer: Barometer.
12. What is the boiling point of water
in the Fahrenheit scale? Answer: 212°F.
13. Which metal is liquid at room
temperature? Answer: Mercury
($Hg$).
14. The power house of the cell is known
as: Answer: Mitochondria.
15. Which blood group is known as the
"Universal Donor"? Answer: O Negative (O-).
16. What is the main component of LPG
(Liquefied Petroleum Gas)? Answer: Butane and Propane.
17. Which acid is found in vinegar? Answer: Acetic Acid
($CH_3COOH$).
18. Sound waves cannot travel through
which medium? Answer: Vacuum.
19. Who is known as the father of
Genetics? Answer: Gregor
Mendel.
20.Which element has the atomic number
1? Answer: Hydrogen
($H$).
21. What is the frequency of Ultrasound? Answer: Above
20,000 Hz.
22.Which part of the eye is responsible
for color vision? Answer: Cones
(located in the Retina).
23.The chemical formula for Heavy Water
is: Answer: $D_2O$ (Deuterium
Oxide).
24.Which planet is the hottest in the
Solar System? Answer: Venus.
25.Bronze is an alloy of which two
metals? Answer: Copper
and Tin.
26.Which enzyme is present in human
saliva? Answer: Salivary
Amylase (Ptyalin).
27.What is the speed of light in a
vacuum? Answer: Approximately
300,000 km/s.
28.Which gas is commonly known as
"Laughing Gas"? Answer: Nitrous Oxide ($N_2O$).
29.Rickets is caused by the deficiency
of which vitamin? Answer: Vitamin
D.
30.Which organ in the human body
produces Insulin? Answer: Pancreas.
31. What is the chemical name of Vitamin
C? Answer: Ascorbic
Acid.
32.The intensity of an earthquake is
measured on which scale? Answer: Richter Scale.
33.Which phenomenon causes the
twinkling of stars? Answer: Atmospheric
Refraction.
34.What is the pH value of pure water? Answer: 7
(Neutral).
35.Which metal is the best conductor of
electricity? Answer: Silver
($Ag$).
36.The deficiency of Iodine causes
which disease? Answer: Goitre.
37.Which mirror is used in the
headlights of cars? Answer: Concave
Mirror.
38.What is the main gas present in the
Sun? Answer: Hydrogen.
39.The study of the Universe is known
as: Answer: Cosmology.
40.Which non-metal is a good conductor
of electricity? Answer: Graphite.
41. What is the life span of Red Blood
Cells (RBCs)? Answer: Approximately
120 days.
42.Who discovered Penicillin? Answer: Alexander
Fleming.
43.Which device converts AC to DC? Answer: Rectifier.
44.What is the chemical symbol for
Gold? Answer: $Au$.
45.Which gas is responsible for Global
Warming? Answer: Greenhouse
gases (primarily Carbon Dioxide and Methane).
46.The Newton's First Law of Motion is
also known as: Answer: Law
of Inertia.
47.Which acid is present in an ant's
sting? Answer: Formic
Acid (Methanoic Acid).
48.What is the percentage of Oxygen in
the human body? Answer: Approximately
65%.
49.Which part of the plant is
responsible for the transport of water? Answer: Xylem.
50.What is the primary source of energy
for the Earth? Answer: The
Sun.
51. Which tissue transports food from leaves to other parts of the plant? Answer: Phloem.
52.What is the chemical formula of
Washing Soda? Answer: Sodium
Carbonate ($Na_2CO_3$).
53.Which planet has the largest number
of natural satellites (moons)? Answer: Saturn.
54.What is the unit of power of a lens? Answer: Dioptre.
55.Which gland is known as the
"Master Gland" of the human body? Answer: Pituitary
Gland.
56.What is the main constituent of
Marsh Gas? Answer: Methane
($CH_4$).
57.Which law states that energy can
neither be created nor destroyed? Answer: Law of Conservation of Energy.
58.Which vitamin is also known as
Retinol? Answer: Vitamin
A.
59.What is the escape velocity from the
Earth's surface? Answer: Approximately
11.2 km/s.
60.Which metal is used in the filament
of an electric bulb? Answer: Tungsten
($W$).
61. What is the common name for Calcium
Hypochlorite? Answer: Bleaching
Powder.
62.Which part of the plant cell is
known as the 'suicide bag'? Answer: Lysosome.
63.What is the primary function of
White Blood Cells (WBCs)? Answer: To fight infections and protect
the immune system.
64.Which isotope of Uranium is used in
nuclear power plants? Answer: $U-235$.
65.What is the chemical name of Baking
Soda? Answer: Sodium
Bicarbonate ($NaHCO_3$).
66.Who proposed the Theory of
Evolution? Answer: Charles
Darwin.
67.Which instrument is used to measure
the purity of milk? Answer: Lactometer.
68.What is the process of conversion of
solid directly into gas called? Answer: Sublimation.
69.Which acid is used in car batteries? Answer: Sulfuric
Acid ($H_2SO_4$).
70.What is the normal temperature of
the human body in Celsius? Answer: 37°C.
71. Which gas is most commonly used in
neon signs? Answer: Neon
($Ne$).
72.What is the SI unit of Force? Answer: Newton
($N$).
73.Which vitamin helps in the clotting
of blood? Answer: Vitamin
K.
74.What is the hardest part of the
human body? Answer: Tooth
Enamel.
75.Which gas is produced during the
process of fermentation? Answer: Carbon Dioxide ($CO_2$).
76.What is the chemical name of Quartz? Answer: Silicon
Dioxide ($SiO_2$).
77.Which scientist discovered the
Electron? Answer: J.J.
Thomson.
78.What is the study of birds called? Answer: Ornithology.
79.Which lens is used to correct Myopia
(Short-sightedness)? Answer: Concave
Lens.
80.What is the main ore of Aluminum? Answer: Bauxite.
81. Which gas is known as the "King
of Chemicals"? Answer: Sulfuric
Acid ($H_2SO_4$).
82.What is the SI unit of Pressure? Answer: Pascal
($Pa$).
83.Which hormone is known as the
"Fight or Flight" hormone? Answer: Adrenaline (Epinephrine).
84.Which light color has the longest
wavelength? Answer: Red.
85.What is the chemical symbol for
Silver? Answer: $Ag$.
86.Which part of the flower becomes the
fruit after fertilization? Answer: Ovary.
87.What is the name of the first cloned
sheep? Answer: Dolly.
88.Which instrument is used to measure
the speed of a vehicle? Answer: Speedometer.
89.What is the most abundant metal in
the Earth's crust? Answer: Aluminum.
90.Which deficiency causes Scurvy? Answer: Vitamin C.
91. What is the chemical formula for
Ozone? Answer: $O_3$.
92.Which scientist discovered the Law
of Gravity? Answer: Isaac
Newton.
93.What is the liquid part of human
blood called? Answer: Plasma.
94.Which acid is found in lemons and
oranges? Answer: Citric
Acid.
95.What is the SI unit of Work and
Energy? Answer: Joule
($J$).
96.Which gas is filled in electric
bulbs to prevent filament oxidation? Answer: Argon or Nitrogen.
97.What is the study of insects called? Answer: Entomology.
98.Which planet is known as the
"Earth's Twin"? Answer: Venus.
99.What is the chemical name for Dry
Ice? Answer: Solid
Carbon Dioxide.
100.
Which part of the human ear is responsible for maintaining
balance? Answer: Semicircular
canals (Inner Ear).
101. Which gas is used in the ripening of raw fruits? Answer: Ethylene (or Acetylene).
102.
What is the SI unit of Thermodynamic Temperature? Answer: Kelvin
($K$).
103.
Which part of the human eye is transplanted during a
donation? Answer: Cornea.
104.
What is the chemical name of "Caustic Soda"? Answer: Sodium
Hydroxide ($NaOH$).
105.
Who discovered the Nucleus in an atom? Answer: Ernest
Rutherford.
106.
Which metal is commonly used for making electromagnets? Answer: Soft Iron.
107.
The "Double Helix" model of DNA was given by: Answer: Watson and
Crick.
108.
Which phenomenon is responsible for the blue color of the
sky? Answer: Rayleigh
Scattering.
109.
What is the chemical name of Vitamin B12? Answer: Cyanocobalamin.
110.
Which instrument is used to detect and record earthquakes? Answer: Seismograph.
111.
What is the main component of Natural Gas? Answer: Methane
($CH_4$).
112.
Which mirror is used by dentists to see large images of
teeth? Answer: Concave
Mirror.
113.
What is the process of coating iron with zinc to prevent
rusting? Answer: Galvanization.
114.
Which acid is present in the human stomach to help
digestion? Answer: Hydrochloric
Acid ($HCl$).
115.
What is the value of 'g' (acceleration due to gravity) at
the Earth's center? Answer: Zero.
116.
Which element is used in the manufacture of safety matches? Answer: Red
Phosphorus.
117.
What is the functional unit of the Kidney? Answer: Nephron.
118.
Which gas is leaked in the Bhopal Gas Tragedy of 1984? Answer: Methyl
Isocyanate ($MIC$).
119.
What is the chemical name of Plaster of Paris? Answer: Calcium
Sulfate Hemihydrate ($CaSO_4 \cdot \frac{1}{2}H_2O$).
120.
Which planet is known as the "Lord of the Rings"? Answer: Saturn.
121.
What is the SI unit of Radioactivity? Answer: Becquerel
($Bq$).
122.
Which enzyme digests proteins in the stomach? Answer: Pepsin.
123.
What is the purest form of Iron? Answer: Wrought
Iron.
124.
Which physical quantity is measured in 'Light Years'? Answer: Distance
(Astronomical).
125.
What is the chemical symbol for Lead? Answer: $Pb$.
126.
Which part of the brain is the center for thirst, hunger,
and sleep? Answer: Hypothalamus.
127.
Who is known as the Father of Modern Chemistry? Answer: Antoine
Lavoisier.
128.
What is the main source of Vitamin C? Answer: Citrus
fruits (e.g., Amla, Lemon, Orange).
129.
Which metal is the best absorber of X-rays? Answer: Lead.
130.
What is the common name for Sodium Hypochlorite? Answer: Liquid
Bleach.
131.
Which gas is used for artificial respiratory systems (in
cylinders)? Answer: Oxygen
and Helium.
132.
What is the SI unit of Luminous Intensity? Answer: Candela
($cd$).
133.
Which pigment gives human skin its color? Answer: Melanin.
134.
What is the primary metal in the Earth's Core? Answer: Iron
($Fe$).
135.
Which law explains the working of a hydraulic lift? Answer: Pascal’s
Law.
136.
What is the chemical name of Vitamin E? Answer: Tocopherol.
137.
Which gas is used to fill the tires of an aircraft? Answer: Nitrogen.
138.
What is the largest gland in the human body? Answer: Liver.
139.
Which acid is used to remove ink and rust stains from cloth? Answer: Oxalic
Acid.
140.
What is the atomic number of Carbon? Answer: 6.
141.
Which lens is used to correct Presbyopia? Answer: Bifocal
Lens.
142.
What is the main source of energy in stars? Answer: Nuclear Fusion.
143.
Which metal is stored in Kerosene to prevent its reaction
with air? Answer: Sodium
($Na$).
144.
What is the study of tissues called? Answer: Histology.
145.
Which gas is used in a "Soda Water" bottle? Answer: Carbon
Dioxide ($CO_2$).
146.
What is the SI unit of Magnetic Induction? Answer: Tesla
($T$).
147.
Which blood cells are responsible for oxygen transport? Answer: Erythrocytes
(RBCs).
148.
What is the chemical name of "Aspirin"? Answer: Acetylsalicylic
Acid.
149.
Which scale is used to measure the depth of the ocean? Answer: Fathometer.
150.
What is the process of heating ore in the absence of air
called? Answer: Calcination.
151. Which element is known as the "Liquid Gold"? Answer: Petroleum.
152.
What is the SI unit of Viscosity? Answer: Poiseuille
($Pa \cdot s$).
153.
Which part of the plant performs the process of
Transpiration? Answer: Stomata.
154.
What is the chemical name of Vitamin B1? Answer: Thiamine.
155.
Which gas is most commonly used in the manufacture of
Vegetable Ghee? Answer: Hydrogen.
156.
What is the density of water maximum at? Answer: 4°C.
157.
Which gland is both an exocrine and an endocrine gland? Answer: Pancreas.
158.
What is the main chemical constituent of Clay? Answer: Aluminum
Silicate.
159.
Which instrument is used to measure the intensity of light? Answer: Photometer.
160.
What is the chemical formula of Chalk (Calcium Carbonate)? Answer: $CaCO_3$.
161.
Which planet is known as the "Green Planet"? Answer: Uranus
(due to methane gas).
162.
What is the functional unit of the Nervous System? Answer: Neuron.
163.
Which acid is used in the eye wash? Answer: Boric
Acid.
164.
What is the SI unit of Frequency? Answer: Hertz
($Hz$).
165.
Which metal is used in the process of Vulcanization of
rubber? Answer: Sulfur
(Non-metal used for the process).
166.
What is the lifespan of White Blood Cells (WBCs)? Answer: 13 to 20
days.
167.
Which law describes the relationship between pressure and
volume of a gas? Answer: Boyle's
Law.
168.
What is the chemical name of Vitamin D2? Answer: Ergocalciferol.
169.
Which component of blood is responsible for clotting? Answer: Platelets
(Thrombocytes).
170.
What is the hardest metal found on Earth? Answer: Tungsten.
171.
Which gas is released during the process of Photolysis in
plants? Answer: Oxygen.
172.
What is the SI unit of Capacitance? Answer: Farad
($F$).
173.
Which element is used in the lead of a pencil? Answer: Graphite.
174.
What is the study of the heart called? Answer: Cardiology.
175.
Which type of lens is used in a magnifying glass? Answer: Convex
Lens.
176.
What is the chemical name of "Table Sugar"? Answer: Sucrose.
177.
Which gas is known as "Stranger Gas"? Answer: Xenon
($Xe$).
178.
What is the primary function of the Large Intestine? Answer: Absorption
of water.
179.
Which metal is generally used for making bells? Answer: Bronze
(Copper and Tin).
180.
What is the SI unit of Power? Answer: Watt
($W$).
181.
Which acid is found in Apples? Answer: Malic
Acid.
182.
What is the chemical name of Vitamin B2? Answer: Riboflavin.
183.
Which part of the brain controls involuntary actions like
heartbeat? Answer: Medulla
Oblongata.
184.
What is the process of converting milk into curd called? Answer: Fermentation
(Lactic acid fermentation).
185.
Which isotope is used to determine the age of fossils? Answer: Carbon-14
($C-14$).
186.
What is the SI unit of Resistance? Answer: Ohm
($\Omega$).
187.
Which gas is used to preserve biological specimens? Answer: Liquid
Nitrogen.
188.
What is the study of the Liver called? Answer: Hepatology.
189.
Which element is the most abundant in the Earth's crust by
weight? Answer: Oxygen
(approx. 46%).
190.
What is the chemical formula for Epsom Salt? Answer: $MgSO_4
\cdot 7H_2O$.
191.
Which force keeps the planets in orbit around the Sun? Answer: Gravitational
Force.
192.
What is the chemical name of Vitamin A1? Answer: Retinol.
193.
Which light color is scattered the most by the atmosphere? Answer: Violet/Blue.
194.
What is the study of fossils called? Answer: Paleontology.
195.
Which mirror is used as a rear-view mirror in vehicles? Answer: Convex
Mirror.
196.
What is the pH of human blood? Answer: Approximately
7.4.
197.
Which gas is used in the treatment of Cancer? Answer: Radon
($Rn$).
198.
What is the SI unit of Inductance? Answer: Henry ($H$).
199.
Which part of the plant is Ginger? Answer: Modified
Stem (Rhizome).
200. What is the chemical name of Vitamin
B3? Answer: Niacin.
201. Which gas is commonly known as "Marsh Gas"? Answer: Methane ($CH_4$).
202. What is the SI unit of Electric
Charge? Answer: Coulomb
($C$).
203. Which part of the brain is
responsible for memory and intelligence? Answer: Cerebrum.
204. What is the chemical name of Vitamin
B5? Answer: Pantothenic
Acid.
205. Which metal is extracted from the
ore 'Cinnabar'? Answer: Mercury
($Hg$).
206. What is the phenomenon of splitting
white light into seven colors called? Answer: Dispersion.
207. Which gland is known as the
"Clock of the Body"? Answer: Pineal Gland.
208. What is the chemical name of
"Laughing Gas"? Answer: Nitrous Oxide ($N_2O$).
209. Which instrument is used to measure
the growth of plants? Answer: Crescograph.
210.
What is the SI unit of Magnetic Flux? Answer: Weber
($Wb$).
211.
Which planet is known as the "Morning Star" or
"Evening Star"? Answer: Venus.
212.
What is the primary function of Hemoglobin? Answer: Transport
of Oxygen.
213.
Which acid is used in the manufacture of Dynamite? Answer: Nitric
Acid.
214.
What is the study of the Earth’s structure called? Answer: Geology.
215.
Which lens is used to correct Astigmatism? Answer: Cylindrical
Lens.
216.
What is the chemical name of Vitamin B6? Answer: Pyridoxine.
217.
Which non-metal is liquid at room temperature? Answer: Bromine
($Br$).
218.
What is the process of a liquid changing into vapor below
its boiling point? Answer: Evaporation.
219.
Which scientist discovered the Neutron? Answer: James
Chadwick.
220. What is the SI unit of Impulse? Answer: Newton-second
($N \cdot s$).
221.
Which gas is used to inflate weather balloons? Answer: Helium or
Hydrogen.
222. What is the study of the skin
called? Answer: Dermatology.
223. Which metal is the lightest metal on
Earth? Answer: Lithium
($Li$).
224. What is the chemical name of Vitamin
B7? Answer: Biotin.
225. Which part of the human body never
rests? Answer: Heart.
226. What is the chemical formula for
Rust? Answer: Hydrated
Iron (III) Oxide ($Fe_2O_3 \cdot nH_2O$).
227. Which instrument is used to measure
humidity in the air? Answer: Hygrometer.
228. What is the study of the moon
called? Answer: Selenology.
229. Which gas is used in the production
of ammonia by Haber's Process? Answer: Nitrogen and Hydrogen.
230. What is the SI unit of Surface
Tension? Answer: Newton
per meter ($N/m$).
231.
Which hormone is responsible for the regulation of blood
sugar? Answer: Insulin.
232. What is the chemical name of Vitamin
B9? Answer: Folic
Acid.
233. Which color of light is least
scattered by fog or smoke? Answer: Red.
234. What is the study of the kidneys
called? Answer: Nephrology.
235. Which device is used to step up or
step down the voltage of AC? Answer: Transformer.
236. What is the chemical name of
"Milk of Magnesia"? Answer: Magnesium Hydroxide ($Mg(OH)_2$).
237. Which element is the most abundant
in the Sun? Answer: Hydrogen
(approx. 73%).
238. What is the lifespan of platelets in
the human body? Answer: 7
to 10 days.
239. Which metal is used in the
galvanization of steel? Answer: Zinc.
240. What is the SI unit of Torque? Answer: Newton-meter
($N \cdot m$).
241.
Which gas is used as an anesthetic in surgeries? Answer: Nitrous
Oxide (or Chloroform).
242. What is the chemical name of Vitamin
K1? Answer: Phylloquinone.
243. Which part of the cell is known as
the "Brain of the Cell"? Answer: Nucleus.
244. What is the study of fish called? Answer: Ichthyology.
245. Which mirror is used in a
"Solar Cooker"? Answer: Concave Mirror.
246. What is the chemical name of
"Common Alum"? Answer: Potassium Aluminum Sulfate.
247. Which gas is used in the
purification of water? Answer: Chlorine.
248. What is the SI unit of Sound
Intensity? Answer: Decibel
($dB$).
249. Which vitamin is destroyed by
overcooking? Answer: Vitamin
C.
250. What is the main component of Bone
and Teeth? Answer: Calcium
Phosphate.
251. Which element is used in the manufacturing of transistors? Answer: Silicon or Germanium.
252. What is the SI unit of Solid Angle? Answer: Steradian
($sr$).
253. Which part of the human eye adjusts
the size of the pupil? Answer: Iris.
254. What is the chemical name of Vitamin
D3? Answer: Cholecalciferol.
255. Which gas is used in the
"Ostwald Process" to manufacture Nitric Acid? Answer: Ammonia.
256. What is the principle behind the
working of an Optical Fiber? Answer: Total Internal Reflection.
257. Which gland is known as the
"Emergency Gland"? Answer: Adrenal Gland.
258. What is the chemical name of
"Lunar Caustic"? Answer: Silver Nitrate ($AgNO_3$).
259. Which instrument is used to measure
the depth of the ocean? Answer: Fathometer.
260. What is the SI unit of Radioactivity
(Traditional)? Answer: Curie
($Ci$).
261.
Which planet is known as the "Gas Giant"? Answer: Jupiter.
262. What is the primary function of
Lymphocytes? Answer: Producing
antibodies to fight pathogens.
263. Which acid is used in the
preservation of juice and soft drinks? Answer: Benzoic Acid.
264. What is the study of the Earth’s
atmosphere called? Answer: Meteorology.
265. Which lens is used in a telescope
(objective)? Answer: Convex
Lens.
266. What is the chemical name of Vitamin
B17? Answer: Amygdalin.
267. Which metal is known as the
"Metal of Hope"? Answer: Uranium.
268. What is the process of water passing
through a semi-permeable membrane? Answer: Osmosis.
269. Which scientist discovered the
Proton? Answer: Ernest
Rutherford.
270. What is the SI unit of Angular
Velocity? Answer: Radian
per second ($rad/s$).
271.
Which gas is used in the "Contact Process" to make
Sulfuric Acid? Answer: Sulfur
Dioxide.
272. What is the study of the nervous
system called? Answer: Neurology.
273. Which metal is the most ductile and
malleable? Answer: Gold
($Au$).
274. What is the chemical name of Vitamin
H? Answer: Biotin (also
known as B7).
275. Which part of the human brain
controls muscular coordination? Answer: Cerebellum.
276. What is the chemical formula for
Gypsum? Answer: Calcium
Sulfate Dihydrate ($CaSO_4 \cdot 2H_2O$).
277. Which instrument is used to measure
the intensity of solar radiation? Answer: Pyrheliometer.
278. What is the study of the sun called? Answer: Heliology.
279. Which gas is used in fire alarms
(Ionization type)? Answer: Americium-241
(Radioactive source).
280. What is the SI unit of Electric
Conductance? Answer: Siemens
($S$).
281.
Which hormone is known as the "Love Hormone"? Answer: Oxytocin.
282. What is the chemical name of Vitamin
P? Answer: Bioflavonoids.
283. Which color of light has the highest
frequency? Answer: Violet.
284. What is the study of the stomach and
intestines called? Answer: Gastroenterology.
285. Which device converts mechanical
energy into electrical energy? Answer: Generator (Dynamo).
286. What is the chemical name of
"Quick Lime"? Answer: Calcium Oxide ($CaO$).
287. Which element is essential for the
transmission of nerve impulses? Answer: Sodium ($Na$).
288. What is the lifespan of a human Red
Blood Cell? Answer: 120
Days.
289. Which metal is used as a moderator
in nuclear reactors? Answer: Cadmium
or Boron (as control rods).
290. What is the SI unit of Molar Heat
Capacity? Answer: Joule
per mole-Kelvin ($J/(mol \cdot K)$).
291.
Which gas is used to provide an inert atmosphere in welding? Answer: Argon or
Helium.
292. What is the chemical name of Vitamin
M? Answer: Folic
Acid.
293. Which part of the cell is known as
the "Protein Factory"? Answer: Ribosome.
294. What is the study of snakes called? Answer: Ophiology.
295. Which mirror is used in
"Periscopes"? Answer: Plane Mirror.
296. What is the chemical name of
"Blue Vitriol"? Answer: Copper Sulfate Pentahydrate
($CuSO_4 \cdot 5H_2O$).
297. Which gas is used as a coolant in
refrigerators (Eco-friendly)? Answer: HFCs or Ammonia.
298. What is the SI unit of Stress? Answer: Pascal
($Pa$).
299. Which vitamin is known as the
"Sunshine Vitamin"? Answer: Vitamin D.
300. What is the main component of the
exoskeleton of insects? Answer: Chitin.
301.
Which gas is most commonly used in the manufacture of glass? Answer: Sulfur
Dioxide (as a refining agent).
302. What is the SI unit of Electric
Potential? Answer: Volt
($V$).
303. Which part of the brain is the
center for visual processing? Answer: Occipital Lobe.
304. What is the chemical name of Vitamin
B8? Answer: Inositol.
305. Which metal is found in the center
of a Chlorophyll molecule? Answer: Magnesium ($Mg$).
306. What is the phenomenon of light
bending as it passes from one medium to another? Answer: Refraction.
307. Which gland is known as the
"Third Eye" of the human body? Answer: Pineal Gland.
308. What is the chemical name of
"Heavy Water"? Answer: Deuterium Oxide ($D_2O$).
309. Which instrument is used to measure
the rate of flow of a liquid? Answer: Venturimeter.
310.
What is the SI unit of Thermal Conductivity? Answer: Watt per
meter-Kelvin ($W/(m \cdot K)$).
311.
Which planet is known as the "Ringed Planet"? Answer: Saturn.
312.
What is the primary function of the Gallbladder? Answer: To store
and concentrate bile.
313.
Which acid is used in the manufacturing of fertilizers like
Superphosphate? Answer: Sulfuric
Acid ($H_2SO_4$).
314.
What is the study of the hair called? Answer: Trichology.
315.
Which lens is used in a Compound Microscope? Answer: Convex
Lens (both Objective and Eyepiece).
316.
What is the chemical name of Vitamin B4? Answer: Adenine
(no longer classified as a vitamin but still studied in this context).
317.
Which metal is the best conductor of heat? Answer: Silver
($Ag$).
318.
What is the process of a gas changing directly into a solid? Answer: Deposition.
319.
Who discovered the law of Electrolysis? Answer: Michael
Faraday.
320. What is the SI unit of Luminous
Flux? Answer: Lumen
($lm$).
321.
Which gas is known as "Fire Damp" in coal mines? Answer: Methane
($CH_4$).
322. What is the study of the teeth
called? Answer: Odontology.
323. Which metal is known as
"Strategic Metal"? Answer: Titanium ($Ti$).
324. What is the chemical name of Vitamin
B15? Answer: Pangamic
Acid.
325. Which part of the ear converts sound
vibrations into electrical signals? Answer: Cochlea.
326. What is the chemical formula for
Slaked Lime? Answer: Calcium
Hydroxide ($Ca(OH)_2$).
327. Which instrument is used to measure
very high temperatures (like the Sun)? Answer: Pyrometer.
328. What is the study of the structure
of the body called? Answer: Anatomy.
329. Which gas is used in the
"Solvay Process" to produce Sodium Carbonate? Answer: Ammonia
and Carbon Dioxide.
330. What is the SI unit of Magnetic
Field Strength? Answer: Ampere
per meter ($A/m$).
331.
Which hormone is responsible for the regulation of the
sleep-wake cycle? Answer: Melatonin.
332. What is the chemical name of Vitamin
B10? Answer: Para-aminobenzoic
acid (PABA).
333. Which color of light is scattered
the least by the atmosphere? Answer: Red.
334. What is the study of the blood
called? Answer: Hematology.
335. Which device converts electrical
energy into sound energy? Answer: Loudspeaker.
336. What is the chemical name of
"Epsom Salt"? Answer: Magnesium Sulfate.
337. Which element is used as a fuel in
nuclear reactors? Answer: Uranium
($U$) or Thorium ($Th$).
338. What is the average life span of a
human Sperm cell? Answer: 3
to 5 days.
339. Which metal is used in the
construction of aircraft? Answer: Duralumin (Aluminum alloy).
340. What is the SI unit of Kinematic
Viscosity? Answer: Square
meter per second ($m^2/s$).
341.
Which gas is used as a propellant in aerosol cans? Answer: Butane or
Propane.
342. What is the chemical name of Vitamin
T? Answer: Termitin
(found in sesame seeds).
343. Which part of the cell is known as
the "Digestive Bag"? Answer: Lysosome.
344. What is the study of the nails
called? Answer: Onychology.
345. Which mirror is used in
"Shaving Mirrors"? Answer: Concave Mirror.
346. What is the chemical name of
"White Vitriol"? Answer: Zinc Sulfate ($ZnSO_4 \cdot
7H_2O$).
347. Which gas is used in the
vulcanization of rubber (as a byproduct/agent)? Answer: Sulfur
Dioxide.
348. What is the SI unit of Momentum? Answer: Kilogram-meter
per second ($kg \cdot m/s$).
349. Which vitamin is found in abundance
in Fish Liver Oil? Answer: Vitamin
A and Vitamin D.
350. What is the main component of
Natural Silk? Answer: Fibroin
(a protein).
351.
Which element is used in the casing of nuclear bombs to increase
the yield? Answer: Uranium-238.
352. What is the SI unit of Electric
Field Strength? Answer: Newton
per Coulomb ($N/C$) or Volt per meter ($V/m$).
353. Which part of the brain is
responsible for processing emotions? Answer: Amygdala.
354. What is the chemical name of Vitamin
B11? Answer: Salicylic
Acid.
355. Which metal is known as the
"Metal of the Future"? Answer: Titanium.
356. What is the phenomenon where a wave
changes direction upon hitting a barrier? Answer: Reflection.
357. Which gland in the human body
disappears or shrinks during puberty? Answer: Thymus Gland.
358. What is the chemical name of
"Common Bleach"? Answer: Sodium Hypochlorite.
359. Which instrument is used to measure
the power of electric circuits? Answer: Wattmeter.
360. What is the SI unit of Absorbed Dose
of radiation? Answer: Gray
($Gy$).
361.
Which planet is known for having a "Great Red
Spot"? Answer: Jupiter.
362. What is the primary function of the
Spleen? Answer: To
filter blood and store platelets/white blood cells.
363. Which acid is used to make
explosives like TNT? Answer: Nitric
Acid.
364. What is the study of the Earth’s
magnetism called? Answer: Geomagnetism.
365. Which lens is used to correct
Hypermetropia (Long-sightedness)? Answer: Convex Lens.
366. What is the chemical name of Vitamin
Bw? Answer: Biotin
(another name for Vitamin B7/H).
367. Which metal is used as a filament in
vacuum tubes? Answer: Tungsten.
368. What is the process of a liquid
turning into a solid called? Answer: Freezing or Solidification.
369. Who discovered the concept of the
"Half-life" of radioactive elements? Answer: Ernest
Rutherford.
370. What is the SI unit of Radiant
Intensity? Answer: Watt
per steradian ($W/sr$).
371.
Which gas is used in the "Solvay Process" as a
catalyst/reagent? Answer: Ammonia.
372. What is the study of the lungs
called? Answer: Pulmonology.
373. Which metal is the most abundant in
the human body? Answer: Calcium.
374. What is the chemical name of Vitamin
J? Answer: Choline
(sometimes referred to as Vitamin J in older texts).
375. Which part of the eye is sensitive
to low light levels? Answer: Rods.
376. What is the chemical formula for Magnetite? Answer: $Fe_3O_4$.
377. Which instrument is used to measure
the velocity of wind? Answer: Anemometer.
378. What is the study of animal behavior
called? Answer: Ethology.
379. Which gas is used in the commercial
production of Nitric acid? Answer: Nitrogen Dioxide.
380. What is the SI unit of Magnetic
Permeability? Answer: Henry
per meter ($H/m$).
381.
Which hormone is often called the "Stress
Hormone"? Answer: Cortisol.
382. What is the chemical name of Vitamin
L1? Answer: Anthranilic
Acid.
383. Which color of light is least
refracted when passing through a prism? Answer: Red.
384. What is the study of the immune
system called? Answer: Immunology.
385. Which device converts heat energy
directly into electrical energy? Answer: Thermoelectric Generator.
386. What is the chemical name of
"Green Vitriol"? Answer: Ferrous Sulfate ($FeSO_4 \cdot
7H_2O$).
387. Which element is essential for the
production of Thyroxine? Answer: Iodine.
388. What is the average lifespan of a
human Skin cell? Answer: 2
to 4 weeks.
389. Which metal is added to steel to
make it stainless? Answer: Chromium.
390. What is the SI unit of Heat Flux
Density? Answer: Watt
per square meter ($W/m^2$).
391.
Which gas is known as "Wood Gas"? Answer: A mixture
of Nitrogen, Hydrogen, and Carbon Monoxide.
392. What is the chemical name of Vitamin
U? Answer: S-Methylmethionine.
393. Which part of the cell is known as
the "Storehouse of the Cell"? Answer: Vacuole.
394. What is the study of mushrooms
called? Answer: Mycology.
395. Which mirror is used in
"Searchlights"? Answer: Concave Mirror.
396. What is the chemical name of
"Red Vitriol"? Answer: Cobalt(II) Sulfate.
397. Which gas is produced when metals
react with acids? Answer: Hydrogen.
398. What is the SI unit of Specific Heat
Capacity? Answer: Joule
per kilogram-Kelvin ($J/(kg \cdot K)$).
399. Which vitamin is known for its role
in preventing Beriberi? Answer: Vitamin B1 (Thiamine).
400. What is the main component of a
Pearl? Answer: Calcium
Carbonate (Aragonite and Conchiolin).
401. Which element is used in the manufacture of solar cells? Answer: Silicon ($Si$).
402. What is the SI unit of Magnetic
Moment? Answer: Ampere-square
meter ($A \cdot m^2$).
403. Which part of the brain is known as
the "Gateway to the Cerebral Cortex"? Answer: Thalamus.
404. What is the chemical name of Vitamin
B13? Answer: Orotic
Acid.
405. Which metal is used in the
extraction of Gold and Silver via the Cyanide process? Answer: Zinc
($Zn$).
406. What is the phenomenon of an echo
caused by? Answer: Reflection
of sound waves.
407. Which gland is responsible for the
production of Tears? Answer: Lacrimal
Gland.
408. What is the chemical name of
"Baking Powder"? Answer: Sodium Bicarbonate mixed with
Tartaric Acid.
409. Which instrument is used to measure
the purity of Gold? Answer: Karatmeter.
410.
What is the SI unit of Equivalent Conductance? Answer: $\Omega^{-1}
\cdot cm^2 \cdot g \cdot equiv^{-1}$ (Mho cm²/equivalent).
411.
Which planet is often referred to as the "Watery
Planet"? Answer: Earth.
412.
What is the primary function of the Alveoli in the lungs? Answer: Exchange
of Oxygen and Carbon Dioxide.
413.
Which acid is used in the manufacture of Nylon-6,6? Answer: Adipic
Acid.
414.
What is the study of the Earth’s fossils and prehistoric
life called? Answer: Paleontology.
415.
Which lens is used in a Slide Projector? Answer: Convex
Lens.
416.
What is the chemical name of Vitamin L2? Answer: Adenylthiomethylpentose.
417.
Which metal is the most resistant to corrosion by seawater? Answer: Titanium.
418.
What is the process of cooling a gas rapidly into a liquid
called? Answer: Condensation.
419.
Who discovered the Atomic Number? Answer: Henry
Moseley.
420. What is the SI unit of Illumination? Answer: Lux
($lx$).
421.
Which gas is used in the "Deacon's Process" to
manufacture Chlorine? Answer: Hydrogen
Chloride ($HCl$).
422. What is the study of the human voice
called? Answer: Phonology
(or Laryngology in a medical context).
423. Which metal is known as the "King
of Metals"? Answer: Gold
($Au$).
424. What is the chemical name of Vitamin
P4? Answer: Troxerutin.
425. Which part of the human eye is
sensitive to different colors? Answer: Cones.
426. What is the chemical formula for
Calcite? Answer: $CaCO_3$.
427. Which instrument is used to measure
the salinity of a solution? Answer: Salinometer.
428. What is the study of human
populations called? Answer: Demography.
429. Which gas is used to produce the
"Artificial Rain"? Answer: Silver Iodide ($AgI$) or Dry Ice.
430. What is the SI unit of Electric
Susceptibility? Answer: It
is a dimensionless quantity.
431.
Which hormone is responsible for the development of male
secondary sexual characteristics? Answer: Testosterone.
432. What is the chemical name of Vitamin
B10? Answer: Para-aminobenzoic
acid (PABA).
433. Which color of light has the
shortest wavelength? Answer: Violet.
434. What is the study of the cells
called? Answer: Cytology.
435. Which device is used to convert
light energy into electrical energy? Answer: Photoelectric Cell.
436. What is the chemical name of
"Oil of Vitriol"? Answer: Sulfuric Acid ($H_2SO_4$).
437. Which element is used in the
production of semiconductors? Answer: Germanium ($Ge$).
438. What is the average lifespan of a
human Heart cell? Answer: They
have very limited turnover; most last a lifetime.
439. Which metal is commonly used for
making wires for electric heaters? Answer: Nichrome (Nickel and Chromium).
440. What is the SI unit of Thermal
Resistance? Answer: Kelvin
per Watt ($K/W$).
441.
Which gas is used for the artificial preservation of fruits? Answer: Ethylene
or Carbon Dioxide.
442. What is the chemical name of Vitamin
B12? Answer: Cyanocobalamin.
443. Which part of the cell is known as
the "Chemical Laboratory of the Cell"? Answer: Golgi
Body.
444. What is the study of the skin and
its diseases called? Answer: Dermatology.
445. Which mirror is used in
"Reflecting Telescopes"? Answer: Concave Parabolic Mirror.
446. What is the chemical name of
"Lunar Caustic"? Answer: Silver Nitrate ($AgNO_3$).
447. Which gas is the main component of
the "Greenhouse Effect"? Answer: Water Vapor (followed by Carbon Dioxide).
448. What is the SI unit of Wave Number? Answer: Reciprocal
meter ($m^{-1}$).
449. Which vitamin is known for its role
in preventing Night Blindness? Answer: Vitamin A.
450. What is the main component of
"Talcum Powder"? Answer: Magnesium Silicate (Hydrated).
451.
Which element is used in the manufacturing of high-speed
steel? Answer: Tungsten.
452. What is the SI unit of Electric
Dipole Moment? Answer: Coulomb-meter
($C \cdot m$).
453. Which part of the brain is the
center for regulating body temperature? Answer: Hypothalamus.
454. What is the chemical name of Vitamin
B12a? Answer: Hydroxocobalamin.
455. Which metal is the main constituent
of "German Silver"? Answer: Copper, Zinc, and Nickel (Note: It
contains no actual silver).
456. What is the phenomenon that causes a
mirage in a desert? Answer: Total
Internal Reflection.
457. Which gland is known as the
"Seat of the Soul" (historically by Descartes)? Answer: Pineal
Gland.
458. What is the chemical name of
"Aspirin"? Answer: Acetylsalicylic
Acid.
459. Which instrument is used to measure
the rate of transpiration in plants? Answer: Potometer.
460. What is the SI unit of Molarity? Answer: Moles per
cubic meter ($mol/m^3$) or $mol/L$.
461.
Which planet is known as the "Swift Planet" due to
its fast orbital speed? Answer: Mercury.
462. What is the primary function of the
Nephrons? Answer: Filtration
of blood and urine formation.
463. Which acid is found in the stings of
bees and wasps? Answer: Formic
Acid.
464. What is the study of the Earth’s
rocks called? Answer: Petrology.
465. Which lens is used in a
"Galilean Telescope"? Answer: Convex (Objective) and Concave
(Eyepiece).
466. What is the chemical name of Vitamin
B10? Answer: Para-Aminobenzoic
Acid ($PABA$).
467. Which metal is the most resistant to
acids like Aqua Regia? Answer: Iridium and Ruthenium.
468. What is the process of converting a
liquid into a solid by lowering its temperature? Answer: Solidification.
469. Who discovered the law of Constant
Proportions? Answer: Joseph
Proust.
470. What is the SI unit of Magnetic
Susceptibility? Answer: It
is a dimensionless quantity.
471.
Which gas is used in the production of polyethene? Answer: Ethylene
($C_2H_4$).
472. What is the study of the structure
and function of bones called? Answer: Osteology.
473. Which metal is commonly used for
making the bodies of spaceships? Answer: Titanium alloys.
474. What is the chemical name of Vitamin
B11? Answer: Salicylic
Acid (often grouped with Folates).
475. Which part of the eye determines the
color of a person’s eyes? Answer: Iris.
476. What is the chemical formula for
Siderite? Answer: $FeCO_3$.
477. Which instrument is used to measure
the intensity of an Earthquake? Answer: Seismometer (plotted on the
Richter scale).
478. What is the study of internal organs
called? Answer: Splanchnology.
479. Which gas is used in the "Bosch
Process" to produce Hydrogen? Answer: Water gas (Carbon Monoxide and
Hydrogen).
480. What is the SI unit of Luminous
Efficacy? Answer: Lumen
per Watt ($lm/W$).
481.
Which hormone is primarily responsible for breast milk
production? Answer: Prolactin.
482. What is the chemical name of Vitamin
G? Answer: Riboflavin
(Vitamin B2).
483. Which color of light deviates the
most when passing through a prism? Answer: Violet.
484. What is the study of the ear and its
diseases called? Answer: Otology.
485. Which device converts sound waves
into electrical signals for a phone? Answer: Microphone.
486. What is the chemical name of
"White Lead"? Answer: Basic Lead Carbonate.
487. Which element is essential for the
function of the enzyme Carbonic Anhydrase? Answer: Zinc
($Zn$).
488. What is the average lifespan of a
human Brain cell (Neuron)? Answer: Most last for the entire lifetime
of the person.
489. Which metal is used to coat the
inside of cans to prevent food from reacting with the metal? Answer: Tin
($Sn$).
490. What is the SI unit of Pressure
Gradient? Answer: Pascal
per meter ($Pa/m$).
491.
Which gas is used in a Wilson Cloud Chamber to detect
particles? Answer: Supersaturated
Alcohol or Water Vapor.
492. What is the chemical name of Vitamin
Bc? Answer: Folic
Acid.
493. Which part of the cell is known as
the "Powerhouse" of the cell? Answer: Mitochondria.
494. What is the study of the structure
of the universe called? Answer: Cosmology.
495. Which mirror is used as a reflector
in street lamps? Answer: Convex
Mirror.
496. What is the chemical name of
"Butter of Antimony"? Answer: Antimony Trichloride.
497. Which gas is known as "Sweet
Gas" (in the oil industry)? Answer: Natural gas containing very little
Hydrogen Sulfide.
498. What is the SI unit of Surface
Charge Density? Answer: Coulomb
per square meter ($C/m^2$).
499. Which vitamin is known for its role
in preventing Rickets? Answer: Vitamin D.
500. What is the main component of "Gunpowder"? Answer: Potassium
Nitrate ($KNO_3$), Charcoal, and Sulfur.
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