Assertion (A) & Reason (B) MCQ

MCQ 11 Mark

Assertion (A): Thomson's model of an atom is popularly known as the plum pudding or Christmas pudding model of an atom
Reason (R): According to the Thomson's plum pudding model, an atom is a positively charged sphere in which the electrons are embedded.

✓
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: Thomson's model of an atom is popularly known as the plum pudding or Christmas pudding model of an atom. According to Thomson's plum pudding model, an atom is a positively charged sphere in which the electrons are embedded. The negative charge of the electrons and the positive charge of the sphere are equal in magnitude. Thus, an atom as a whole is electrically neutral.

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MCQ 21 Mark

Assertion (A): 1-day Vinita went to see his brother's competition and he saw his brother in pain and not able to run comfortably.
Reason (R): Two bones can be connected to each other by another type of connective tissue called the ligament. This tissue is very elastic. It has considerable strength.

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: Two bones can be connected to each other by connective tissue called the ligament. Vinita's brother might be suffering from a ligament tear due to which he has pain in the knee while running.

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MCQ 31 Mark

Assertion (A): A gas fills completely the vessel in which it is kept.
Reason (R): Intermolecular force of attraction between the particles of gas is negligible.

✓
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 intermolecular force of attraction between the particles of gas is negligible and is free to move in any direction. Hence it fills completely the vessel in which it is kept.

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MCQ 41 Mark

Assertion (A): Motion with uniform velocity is always along a straight-line path.
Reason (R): In uniform velocity a motion, speed is the magnitude of the velocity and is equal to the instantaneous velocity.

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:Uniform velocity means that speed and direction remain unchanged.

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Science Assertion (A) & Reason (B) MCQ

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