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UPSC Civil Services

All Subjects 207 General Knowledge 439 Indian History & Polity 30 General Science 207 Quantitative Aptitude 1,106 Reasoning Ability 202

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UPSC Civil Services
General Science

UPSC IAS/IPS MCQ questions — History, Polity, Economy, Science, General Studies.

207 Q 5 Subjects Graduate
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Difficulty: All Easy Medium Hard 181–190 of 207
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Q.181 Easy General Science Physics
Sound cannot travel through?
A Water
B Steel
C Vacuum
D Air
Correct Answer:  C. Vacuum
EXPLANATION

Sound needs medium, not vacuum.

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Q.182 Easy General Science Biology
Powerhouse of cell?
A Nucleus
B Ribosome
C Mitochondria
D Lysosome
Correct Answer:  C. Mitochondria
EXPLANATION

Mitochondria produces ATP.

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Q.183 Easy General Science Physics
Ohm Law: V = ?
A I/R
B IR
C I+R
D I-R
Correct Answer:  B. IR
EXPLANATION

V = I × R (Ohm Law).

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Q.184 Easy General Science Environment
Gas causing global warming?
A Oxygen
B Nitrogen
C Carbon Dioxide
D Hydrogen
Correct Answer:  C. Carbon Dioxide
EXPLANATION

CO₂ is main greenhouse gas.

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Q.185 Easy General Science Chemistry
Hardest natural substance?
A Gold
B Iron
C Diamond
D Quartz
Correct Answer:  C. Diamond
EXPLANATION

Diamond = 10 on Mohs scale.

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Q.186 Easy General Science Disease & Health
Vitamin C deficiency causes?
A Rickets
B Scurvy
C Night blindness
D Beriberi
Correct Answer:  B. Scurvy
EXPLANATION

Scurvy from Vitamin C deficiency.

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Q.187 Easy General Science Space & Astronomy
Planet closest to Sun?
A Venus
B Mercury
C Earth
D Mars
Correct Answer:  B. Mercury
EXPLANATION

Mercury is closest to Sun.

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Q.188 Easy General Science Chemistry
Liquid to gas process?
A Condensation
B Precipitation
C Evaporation
D Sublimation
Correct Answer:  C. Evaporation
EXPLANATION

Evaporation = liquid to gas.

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Q.189 Easy General Science Biology
DNA stands for?
A Deoxyribose Nucleic Acid
B Deoxyribonucleic Acid
C Double Nucleic Acid
D Deoxyribonicotinic Acid
Correct Answer:  B. Deoxyribonucleic Acid
EXPLANATION

DNA = Deoxyribonucleic Acid.

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Q.190 Medium General Science Physics
Speed of sound in air?
A 300 m/s
B 343 m/s
C 400 m/s
D 250 m/s
Correct Answer:  B. 343 m/s
EXPLANATION

~343 m/s at 20°C.

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