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Science Assertion (A) & Reason (B) MCQ

Physical and Chemical Changes · Gujarat Board (GSEB) STD 7 (GSEB - English Medium). 6 questions.

Questions

Assertion (A) & Reason (B) MCQ

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6 questions · auto-graded multiple-choice test.

MCQ 11 Mark
The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Sugar can be obtained from its solution by crystallisation.
Reason (R) It is a chemical change.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true, but R is not the correct explanation of A
  • ✓
    A is true, but R is false
  • D
    A is false, but R is true
Answer
Correct option: C.
A is true, but R is false
(C) A is true, but R is false. R can be corrected as Crystallisation is a physical change.
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MCQ 21 Mark
The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Rusting is the formation of rust.
Reason (R) Heating speeds up rusting.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true, but R is not the correct explanation of A
  • ✓
    A is true, but R is false
  • D
    A is false, but R is true
Answer
Correct option: C.
A is true, but R is false
(C) A is true, but R is false. R can be corrected as Heating does not speed up rusting. Moisture, air and salt in water speeds up rusting.
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MCQ 31 Mark
The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Rotting of fruit is a chemical change.
Reason (R) In rotting of fruit, a new substance is formed.
  • ✓
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true, but R is not the correct explanation of A
  • C
    A is true, but R is false
  • D
    A is false, but R is true
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A
A
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MCQ 41 Mark
The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Rusting is prevented by galvanisation.
Reason (R) Galvanisation is depositing a layer of zinc on iron.
  • ✓
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true, but R is not the correct explanation of A
  • C
    A is true, but R is false
  • D
    A is false, but R is true
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A
A
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MCQ 51 Mark
The following questions consist of two statements
Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Iron can be prevented from rusting.
Reason (R) Objects made up of iron are painted to break its direct contact with air and moisture.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • D
    A is false, but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A.
A
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MCQ 61 Mark
The following questions consist of two statements
Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Burning of candle is a physical as well as a chemical change.
Reason (R) Melting of wax is a physical change, while burning of wick and evaporation of some wax is a chemical change.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • D
    A is false, but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A.
A
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