Work done is defined as the dot product of:

A. Force and acceleration
B. Force and area
C. Force and instantaneous velocity
D. Force and displacement

Answer

Correct Answer: D. Force and displacement

Detailed About MCQs

Work done is defined as the dot product of Force vector and displacement vector. W = F.s Work done is a scalar quantity. Note: Instantaneous power is defined as the dot product of the Force vector and instantaneous velocity.

What is the apparent weight of the person when the elevator is accelerating downwards?

A. equal to the actual weight
B. greater than the actual weight
C. less than the actual weight
D. Zero

Answer

Correct Answer: C. less than the actual weight

Detailed About MCQs

The apparent weight of the person becomes less than the actual weight when the elevator is accelerating downwards. The apparent weight of the person becomes more than the actual weight when the elevator is accelerating upwards.

Which Statment is correct about Kinetic energy during the projectile motion?

A. it is minimum at the point of projection
B. it is minimum at the highest point
C. it is maximum at the highest point
D. it is minimum at the point of reaching the ground

Answer

Correct Answer: B. it is minimum at the highest point

Detailed About MCQs

The Kinetic energy of an object is maximum at the point of projection or at the point of reaching the ground. It is minimum at the highest point.

The magnitude of the resultant of two vectors is maximum in which of the following case?

A. when vectors act in the same direction
B. when vectors act in the opposite direction
C. when vectors act at 90° to each other
D. None of the above

Answer

Correct Answer: A. when vectors act in the same direction

Detailed About MCQs

The magnitude of the resultant of two vectors is maximum when vectors act in the same direction. The magnitude of the resultant of two vectors is minimum when vectors act in opposite directions.