Chemical Building Blocks of Life UPSC Questions

Biology

Chemical Building Blocks of Life MCQ Questions


1.
Why should a magnesium ribbon be cleaned before burning in air?
A.
To remove moisture
B.
To remove dirt
C.
To remove oxide layer
D.
To increase brightness
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ANSWER :
C. To remove oxide layer
2.
Which of the following is a balanced chemical equation?
A.
Mg + O₂ → MgO
B.
Zn + H₂SO₄ → ZnSO₄ + H₂
C.
Fe + H₂O → Fe₃O₄ + H₂
D.
Zn + O₂ → ZnO
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ANSWER :
B. Zn + H₂SO₄ → ZnSO₄ + H₂
3.
What kind of reaction is CaO + H₂O → Ca(OH)₂?
A.
Decomposition
B.
Combination
C.
Displacement
D.
Double displacement
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ANSWER :
B. Combination
4.
In which reaction is heat absorbed?
A.
Respiration
B.
Burning of coal
C.
Photosynthesis
D.
Cooking of food
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ANSWER :
C. Photosynthesis
5.
Which of the following is a decomposition reaction?
A.
H₂ + Cl₂ → 2HCl
B.
2AgCl → 2Ag + Cl₂
C.
2KBr + Cl₂ → 2KCl + Br₂
D.
Mg + O₂ → MgO
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ANSWER :
B. 2AgCl → 2Ag + Cl₂
6.
Microsatellite DNA’ is used in the case of which one of the following?

UPSC - 2023

A.
Studying the evolutionary relationships among various species of fauna
B.
Stimulating ‘stem cells’ to transform into diverse functional tissues
C.
Promoting clonal propagation of horticultural plants
D.
Assessing the efficacy of drugs by conducting series of drug trials in a population
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ANSWER :
A. Studying the evolutionary relationships among various species of fauna