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UPSC Civil Services

All Subjects 748 General Knowledge 439 Indian History & Polity 30 General Science 207 Quantitative Aptitude 1,106 Reasoning Ability 202

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UPSC Civil Services

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

748 Q 5 Subjects Graduate
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Difficulty: All Easy Medium Hard 721–730 of 748
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Q.721 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.722 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.723 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.724 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.725 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.726 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.727 Easy General Science Physics
Unit of electric current?
A Volt
B Ohm
C Ampere
D Watt
Correct Answer:  C. Ampere
EXPLANATION

Current measured in Amperes.

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Q.728 Easy General Science Disease & Health
Vitamin produced by sunlight?
A Vitamin A
B Vitamin B12
C Vitamin C
D Vitamin D
Correct Answer:  D. Vitamin D
EXPLANATION

Sunlight → Vitamin D synthesis.

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Q.729 Easy General Science Chemistry
Atomic number of Carbon?
A 6
B 8
C 12
D 14
Correct Answer:  A. 6
EXPLANATION

Carbon atomic number = 6.

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Q.730 Easy General Science Botany
Photosynthesis occurs in?
A Root
B Stem
C Leaf
D Flower
Correct Answer:  C. Leaf
EXPLANATION

In chloroplasts of leaves.

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