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Chemical Building Blocks of Life UPSC Questions
UPSC SYLLABUS
Biology
Chemical Building Blocks of Life
Cells
Classification of Living Things
Reproduction
Genetics & Evolution
Respiration
Tissues
Nutrition
Biotechnology
Plant Physiology
Human Physiology
Natural Resources
Chemical Building Blocks of Life MCQ Questions
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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
๐
View Answer
Rough Work
Error
ANSWER
:
C. To remove oxide layer
2.
Which of the following is a balanced chemical equation?
A.
Mg + Oโ โ MgO
B.
Zn + HโSOโ โ ZnSOโ + Hโ
C.
Fe + HโO โ FeโOโ + Hโ
D.
Zn + Oโ โ ZnO
๐
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Error
ANSWER
:
B. Zn + HโSOโ โ ZnSOโ + Hโ
3.
What kind of reaction is CaO + HโO โ Ca(OH)โ?
A.
Decomposition
B.
Combination
C.
Displacement
D.
Double displacement
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View Answer
Rough Work
Error
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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View Answer
Rough Work
Error
ANSWER
:
C. Photosynthesis
5.
Which of the following is a decomposition reaction?
A.
Hโ + Clโ โ 2HCl
B.
2AgCl โ 2Ag + Clโ
C.
2KBr + Clโ โ 2KCl + Brโ
D.
Mg + Oโ โ MgO
๐
View Answer
Rough Work
Error
ANSWER
:
B. 2AgCl โ 2Ag + Clโ
6.
Microsatellite DNAโ 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 โstem cellsโ 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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View Answer
Rough Work
Error
ANSWER
:
A. Studying the evolutionary relationships among various species of fauna
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