Assertion (A) & Reason (B) MCQ

MCQ 11 Mark

Assertion (A): For noble gases, valency is zero.
Reason (R): Noble gases have 8 valence electrons.

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
C
A is true but R is false.
D
A is false but R is true.

Answer

a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.

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MCQ 21 Mark

Assertion (A): Dendrite is a single, long cylindrical process which forms fine branches terminally.
Reason (R): It consists of short processes arising from the cyton.

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.
C
A is true but R is false.
✓
A is false but R is true.

Answer

Correct option: D.

A is false but R is true.

(d) A is false but R is true.
Explanation: Dendrite consists of short processes called dendrons that arises from the cyton and branches into

dendrites. Axon is a single, long cylindrical process which forms fine branches terminally.

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MCQ 31 Mark

Assertion (A): Naphthalene, camphor, iodine, ammonium chloride are some common examples of the substances which undergo sublimation.
Reason (R): All solids are first converted to liquids and then gases on heating.

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
C
A is true but R is false.
✓
A is false but R is true.

Answer

Correct option: D.

A is false but R is true.

(d) A is false but R is true.
Explanation: Certain solids directly change to the gaseous state upon heating without passing through the liquid state. The

process is called sublimation.

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MCQ 41 Mark

Assertion (A): A boy goes from A to B with a velocity of 20 m/min and comes back from B to A with a velocity of 30 m/min. The average velocity of the boy during the whole journey is zero.
Reason (R): The ratio of speed to the magnitude of velocity when the body is moving in one direction is equal to one.

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
C
A is true but R is false
✓
A is false but R is true.

Answer

Correct option: D.

A is false but R is true.

(d) A is false but R is true.
Explanation: A boy goes from A to B with a velocity of 20 m/min and comes back from B to A with a velocity of 30 m/min.

The average velocity of the boy during the whole journey is 24m/min.

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Science Assertion (A) & Reason (B) MCQ

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