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Science Assertion (A) & Reason (B) MCQ

Model Paper 7 · CBSE STD 9 (CBSE - English Medium). 4 questions.

Questions

Assertion (A) & Reason (B) MCQ

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4 questions · auto-graded multiple-choice test.

MCQ 11 Mark
Assertion (A): The atoms of different elements having same mass number but different atomic numbers are known as isobars.
Reason (R): The sum of protons and neutrons, in the isobars is always different.
  • 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.
Explanation: Sum of protons and neutrons is known as mass number which is same for isobars.

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MCQ 21 Mark
Assertion (A): Student of class IX covered the potted plant with a glass jar, water vapour appears on the wall of the glass jar.
Reason (R): Desert plants, the epidermis has a thick waxy coating of cutin chemical substance with waterproof quality on its outer surface.
  • A
    Both A and R are true and R is the correct explanation of A
  • ✓
    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: B.
Both A and R are true but R is not the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: When the potted plant is covered by a glass jar water vapour appears on the jar because of transpiration due to
which water is released from the plant in the form of water vapour which appears on the glass jar.

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MCQ 31 Mark
Assertion (A): A gas can be easily compressed by applying pressure.
Reason (R): Since the inter-particle spaces in the gaseous state are very small, they cannot be decreased by applying pressure.
  • 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.
Explanation: Since the inter-particle spaces in the gaseous state are very large, they can be decreased by applying pressure.
Thus, a gas can be easily compressed by applying pressure.
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MCQ 41 Mark
Assertion (A): When the displacement of a body is directly proportional to the square of the time. Then the body is moving with uniform acceleration.
Reason (R): The slope of velocity-time graph with time axis gives acceleration.
  • A
    Both A and R are true and R is the correct explanation of A
  • ✓
    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: B.
Both A and R are true but R is not the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Both A and R are true but R is not the correct explanation of A.

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Assertion (A) & Reason (B) MCQ - Science STD 9 Questions - Vidyadip