Question

Directions: Some questions (Assertion – reason type) are given below. Each question contains Statement I (Assertion) and statement II (Reason). Each question has 4 choices (a), (b), (c) and (d) out of which only one is correct. So, select the correct choice.

Statement I If the momentum of a system is changing then it is necessary that some non-zero net force is acting on system

Statement II Law of conservation of momentum holds good in all domains of physics.

• A. Statement I is true, statement II is true, statement II is a correct explanation for statement I
• B. Statement I is true, statement II is true, statement II is not a correct explanation for statement I
• C. Statement I is true, statement II is false
• D. Statement I is false, statement II is true

Answer 1

The correct option is C

Statement I is true, statement II is false

Assertion:

1. Forces can act on a system to conserve linear momentum, but their vector sum should be zero.
2. Hence if some external non-zero force is acting on the system, momentum changes. Statement I is true

Reason:

• For a system of moving particles, the law of conservation of linear momentum applies. It is not applicable to individual particles of a system.
• So the above statement II is not correct

Therefore, Statement I is true, and statement II is false. hence option (c) is the correct answer