Physics MCQS

641. The time rate of displacement is known as:
A. Speed
B. Velocity
C. Acceleration
D. Time Arrow

642. Velocity is a physical quantity that is a:
A. Scalar
B. Vector
C. Time arrow
D. None of these

643. The dimension of velocity is:
A. [LT]
B. [LT2]
C. [LT-1]
D. [LT-2]

644. Which law is applicable in the motion of the rocket in space?
A. Conservation of mass
B. Conservation of energy
C. Conservation of angular momentum
D. Conservation of linear momentum

645. If a body is moving at the same speed, then:
A. Its direction may be changing
B. Its acceleration is variable
C. Its acceleration is zero
D. None of the above

646. If the velocity of a body is uniform, the velocity-time graph is a straight line which is:
A. Parallel to x-axis
B. Parallel
C. At an angle of 45 degrees with x-axis
D. Along the y-axis

647. If the instant velocity does not change, the body is moving with:
A. Initial velocity
B. Variable velocity
C. Uniform velocity
D. None of these

648. Acceleration is:
A. Scalar quantity
B. Vector quantity
C. Constant quantity
D. None of these

649. Deceleration means the speed of the body is:
A. Increasing
B. Decreasing
C. Just moving
D. None of these

650. At the highest point, the vertical component of the velocity of the projectile becomes:
A. Zero
B. Maximum
C. Minimum
D. -1