Assertion (A) & Reason (B) MCQ

MCQ 11 Mark

Assertion (A): Isobars are identical in chemical properties.
Reason (R): Isobars have same atomic number.

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: Isobars are not identical in chemical properties because they have same mass number and different atomic numbers.

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MCQ 21 Mark

Assertion (A): Vascular or conductive tissue is a distinctive feature of complex plants.
Reason (R): Vascular tissue has made survival of complex plants possible in the terrestrial environments.

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: Xylem and phloem are vascular tissues that conduct water, minerals and food to various parts of plants. Vascular tissue is a distinctive feature of complex plants, one that has made their survival in terrestrial environments possible.

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MCQ 31 Mark

Assertion (A): During evaporation of liquids, the temperature remains unaffected.
Reason (R): Kinetic energy of the molecules is directly proportional to absolute temperature.

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: During the evaporation of liquids, the temperature decreases due to the escape of molecules with high energy.

The kinetic energy of the molecules is directly proportional to absolute temperature.

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MCQ 41 Mark

Assertion (A): The speed of the car is constant, its velocity is not constant because the direction of the car is changing continuously.
Reason (R): The direction of velocity is the same as the direction of displacement of the body.

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: When a body does not cover equal distances in equal intervals of time, the velocity is said to be variable or nonuniform velocity. In this case, the speed of the body is not constant. Even if the speed of a body is constant but the direction is

changing, the velocity will not be uniform.

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Science Assertion (A) & Reason (B) MCQ

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