Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

General Knowledge

Topic

Physics

Question:

Which of the following statements is incorrect?

Options:

If lift is stationary or moving with uniform speed (either upward or downward), the apparent weight of a body is equal to its true weight.

If lift is going up with acceleration, the apparent weight of a body is more than the true weight.

If lift is going down with acceleration, the apparent weight of body is more than the true weight.

If the cord of the lift is broken, it falls freely. In this situation the weight of a body in the lift becomes zero. This is the situation of weightlessness.

Correct Answer:

If lift is going down with acceleration, the apparent weight of body is more than the true weight.

Explanation:

Weight of a body in a lift

1. If lift is stationary or moving with uniform speed (either upward or downward), the apparent weight of a body is equal to its true weight.

2. If lift is going up with acceleration, the apparent weight of a body is more than the true weight.

3. If lift is going down with acceleration, the apparent weight of body is less than the true weight.

4. If the cord of the lift is broken, it falls freely. In this situation the weight of a body in the lift becomes zero. This is the situation of weightlessness.

5. While going down, if the acceleration of lift is more than acceleration due to gravity, a body in the lift goes in contact of the ceiling of lift.