Assertion (A) & Reason (B) MCQ

MCQ 11 Mark

Assertion (A): Cathode rays get deflected towards the positive plate of electric field.
Reason (R): Cathode rays consist of negatively charged particles known as electrons.

✓
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: Both A and R are true and R is the correct explanation of A.

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MCQ 21 Mark

Assertion (A): Parenchyma tissue consists of relatively unspecialized cells with thin cell walls and is usually loosely packed
Reason (R): They do not have spaces between them.

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 hut R is false.
Explanation: Parenchyma tissue consists of relatively unspecialized cells with thin cell walls. They are live cells. They are usually loosely packed so that large spaces between them.

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MCQ 31 Mark

Assertion (A): An iron almirah is a solid at room temperature.
Reason (R): Water can flow and it assumes the shape of the containing vessel.

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: Almirah is rigid and has fixed shape. So, it is a solid at room temperature.

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MCQ 41 Mark

Assertion $(A)$ : If a particle is moving with constant velocity, then the average velocity for any time interval is equal to instantaneous velocity.
Reason $(R)$ : If average velocity of a particle moving on a straight line is zero for a given time interval, then instantaneous velocity at some instant within this interval may be zero.

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 $A$

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$.
Explanation: Average velocity $ V _{ av }$
$=\frac{\text { Total displacement }}{\text { Total elapsed time }}=\frac{V t}{t}= V $
$=$ Instantaneous velocity
Hence, assertion is correct. If a particle is in a round trip on a straight line,
then average velocity is zero but at the instant atwhich the particle reverses its direction of motion, velocity is zero.
So, reason is correct. But reason is not the correctexplanation of assertion.

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Science Assertion (A) & Reason (B) MCQ

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