Assertion (A) & Reason (B) MCQ

MCQ 11 Mark

Assertion (A): Bohr's orbits are called stationary orbits.
Reason (R): Electrons remain stationary in these orbits for sometime.

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.

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MCQ 21 Mark

Assertion (A): Epithelial tissue form the lining of the mouth and alimentary canal and protect these organs.
Reason (R): They help in the absorption of water and nutrients.

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 functions of epithelial tissues are as follows:
i. The cells of epithelial tissue form the outer layer of the skin (body surface).
ii. The epithelial tissues inside the body form the lining of the mouth and alimentary canal and protect these organs by
secreting mucous.
iii. They also help in the absorption of water and nutrients.

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MCQ 31 Mark

Assertion (A): Gases are compressible but liquids are not.
Reason (R): Structure of gas and liquid are different.

✓
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: The molecules of a gas are separated very far and there is a lot of empty space between them. Hence gases can

be compressed easily. In liquids molecules are closer to each other and can be brought further closer only under very high

pressure

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MCQ 41 Mark

Assertion (A): Motion of satellites around their planets is considered as accelerated motion.
Reason (R): During their motion, the speed remains constant, while the direction of motion changes continuously.

✓
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: Satellites revolve around their planets in almost circular orbits with constant speed. Thus, during their motion,

the speed remains constant, while the direction of motion changes continuously. As a result, there is a change in their velocity.

Therefore, the motion of satellites around their planets is considered as accelerated motion.

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Science Assertion (A) & Reason (B) MCQ

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