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31. A ball balanced on a vertical rod is an example of ________.
A. Stable equilibrium
B. Unstable equilibrium
C. Neutral equilibrium
D. Perfect equilibrium
ANSWER:B
SOLUTION :Hence, a ball balanced on a vertical rod is an example of unstable equilibrium.
32. Force / mass = ________.
A. Momentum
B. Acceleration
C. Displacement
D. Velocity
ANSWER:B
SOLUTION:The correct answer is option(2) i.e. Force = mass × acceleration. Explanation: Newton’s second law is often stated as F = ma, which means the force (F) acting on an object is equal to the mass (m) of object times its acceleration (a).
33. The motion of an object in a specified direction is called _______.
A. Speed
B. Displacement
C. Velocity
D. Movement
ANSWER:C
SOLUTION:The motion of an object in a specified direction is called velocity. The speed of an object in a particular direction is called velocity.
34. Which activity is not based upon kinetic friction_______.
A. Writing
B. Speaking
C. Hearing
D. Walking
ANSWER:C
SOLUTION:Writing, walking and speaking involves relative motion hence friction exist in these activities whereas hearing is not based on friction.
35. The product of mass and acceleration is called _________.
A. Pressure
B. Impulse
C. Thrust
D. Force
ANSWER:D
SOLUTION:The push or pull on an object with mass that causes it to change its velocity is called force. The product of mass and acceleration is called force.
36. If an object moves with constant velocity, then which one of the following statement is not correct?
A. Its motion is along a straight line
B. Its speed changes with time
C. Its acceleration is zero
D. Its displacement increases linearly with time
ANSWER:D
SOLUTION : Its displacement increases linearly with time
37. Retardation means an object operates from ____.
A. Fixed velocity
B. Decreasing velocity
C. Increasing velocity
D. Uniform velocity
ANSWER:B
SOLUTION: Retardation is the rate at which an object’s velocity decreases over time. Retardation is also known as negative acceleration.
38. To open a door easily, the handle should be fixed ______.
A. Near the hinges
B. Away from mid-point opposite to hinges
C. In the middle
D. None of the above
ANSWER:B
SOLUTION: To open a door easily, the handle should be fixed at the farthest distance from the hinges. This is because the larger the distance from the hinge, the less force is required to move the door.
39. A body is acted upon by two unequal forces in opposite directions, but not in one line . The effect is that the body will have _______.
A. Only rotational motion
B. Only translational motion
C. Neither the rotational nor the translational motion
D. Rotational as well as translational motion
ANSWER:D
SOLUTION: When a body is acted upon by two unequal forces in opposite directions but not in the same line, the body will have both rotational and translational motion.
40. Momentum is measured as the product of ______.
A. Mass and acceleration
B. Mass and acceleration
C. Mass and velocity
D. Mass and inertia
ANSWER:C
SOLUTION: Momentum is the product of mass and velocity. It is a vector quantity having both magnitude and direction.