Assertion (A) & Reason (B) MCQ

MCQ 11 Mark

Assertion (A): Atom is electrically neutral.
Reason (R): A neutral particle, neutron is present in the nucleus of atom.

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: Atom is electrically neutral because the number of protons (positively charged particle) is equal to the number of electrons (negatively charged particle).

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MCQ 21 Mark

Assertion (A): Vessel and sieve tubes both are meant for transport purposes.
Reason (R): Vessels are lignified.

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: The vessel is a long-distance channel for water transport. A Sieve tube is a long-distance channel for the transport of organic nutrients. The wall of the vessel is lignified. Lignification is absent in sieve tubes.

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MCQ 31 Mark

Assertion (A): Solids do not diffuse in air.
Reason (R): The particles are closely packed in solids.

✓
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) Both A and R are true and R is the correct explanation of A.
Explanation: As the particles of solids are closely packed, there exist strong forces of attraction between the particles. Hence, solids do not diffuse in air.

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MCQ 41 Mark

Assertion (A): A boy is enjoying a ride on a merry-go-round which is moving at a constant speed of 10 m/s. The boy is in uniform accelerated motion.
Reason (R): A body has a uniform acceleration if it travels in a straight line and its velocity first decreases then increases by equal amounts in equal intervals of time.

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: A body has a uniform acceleration if it travels in a straight line and its velocity increases by equal amounts in equal intervals of time.

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Science Assertion (A) & Reason (B) MCQ

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