Physics MCQS

621. The area under a velocity-time graph represents?
(A) Acceleration
(B) Change in Acceleration
C) Displacement
(D) Speed

622. A box is at rest on a frictionless surface. Three forces are exerted on the box such that the box remains at rest. One is a force of 100 N towards the east. Another is a force of 100 N towards the north. What is the third force?
(A) Zero N towards the Northeast.
(B) 141.42 N towards the Northeast.
C) 141.42 N towards the Southwest.
(D) None of the above

623. When the velocity of a body is increasing, the acceleration produced is:
A. No acceleration produced
B. Negative acceleration
C. Positive acceleration
D. None of these

624. When a car’s velocity remains constant, the velocity-time graph:
A. Straight line
B. Straight line rises the same height for equal intervals of time
C. Horizontal straight line
D. None of these

625. Raindrops fall towards the ground with constant velocity. This suggests that:
A. Raindrops are not subject to a gravitational field
B. Raindrops are subject to zero gravitational force
C. There is some resistive force acting in the direction opposite to gravity
D. The size of the raindrop is so small that acceleration does not build up

626. When a car moves with increasing acceleration, the velocity-time graph is a:
A. Straight line
B. Horizontal straight line
C. Curve
D. None of these

627. Which of the following can be zero when the particle is in motion for some time?
A. Speed
B. Displacement
C. Distance covered
D. None of these

628. Instantaneous velocity is equal to the average velocity if a body moves with a:
A. Uniform velocity
B. Variable velocity
C. Uniform acceleration
D. Variable acceleration

629. By calculating the area under the velocity graph, we can find the:
A. Acceleration
B. Velocity
C. Distance
D. None of these

630. The interaction forces between two bodies are the subject of Newton’s third law. Which of the following assertions regarding the third law is false?
A. The two forces must be identical.
B. The bodies are in equilibrium because the two forces are equal and opposite to one another.
C. The two forces always oppose each other in direction.
D. The magnitudes of the two forces are always equal.