Chemical Building Blocks of Life UPSC Questions

Biology

Chemical Building Blocks of Life MCQ Questions


13.
Which of the following shows a physical change, not chemical?
A.
Burning of paper
B.
Melting of ice
C.
Rusting of iron
D.
Fermentation of grapes
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ANSWER :
B. Melting of ice
14.
What indicates a chemical reaction has occurred?
A.
Change in shape
B.
Change in texture
C.
Change in temperature
D.
Change in size
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ANSWER :
C. Change in temperature
15.
In the reaction: Zn + H₂SO₄ → ZnSO₄ + H₂, which is the product?
A.
Zinc oxide
B.
Zinc hydroxide
C.
Zinc sulphate
D.
Zinc chloride
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ANSWER :
C. Zinc sulphate
16.
Which equation is balanced?
A.
H₂ + O₂ → H₂O
B.
Fe + H₂O → Fe₃O₄ + H₂
C.
Zn + HCl → ZnCl₂ + H₂
D.
Mg + O₂ → MgO
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ANSWER :
C. Zn + HCl → ZnCl₂ + H₂
17.
Which is an example of an exothermic reaction?
A.
Electrolysis of water
B.
Photosynthesis
C.
Burning of methane
D.
Decomposition of AgCl
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ANSWER :
C. Burning of methane
18.
Which one of the following statements best describes the role of B cells and T cells in the human body?

UPSC - 2022

A.
They protect the body from environmental allergens.
B.
They alleviate the body’s pain and inflammation.
C.
They act as immunosuppressants in the body.
D.
They protect the body from the diseases caused by pathogens.
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ANSWER :
D. They protect the body from the diseases caused by pathogens.