set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Consider the following statements :

1. The objects appear to be more heavy when submerged in water than they are in air.
2. A needle place carefully on the surface of water may float, whereas a ball of the same material will always sink.

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Question : 2

An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil, then

a) is inclined to the horizontal with larger depth at the rear end

b) is inclined to the horizontal with smaller depth at the rear end

c) remains horizontal

d) assumes parabolic curve

Question : 3

An athlete diving off a high springboard can perform a variety of exercises in the air before entering the water below. Which one of the following parameters will remain constant during the fall?

a) The athlete’s kinetic energy

b) The athlete’s moment of inertia

c) The athlete’s linear momentum

d) The athlete’s angular momentum

Question : 4

The circular motion of a particle with constant speed is

a) periodic and simple harmonic

b) periodic but not simple harmonic

c) simple harmonic but not periodic

d) neither periodic nor simple harmonic

Question : 5

In case of negative work the angle between the force and displacement is

a) 90°

b) 45°

c) 0°

d) 180°

Question : 6

When a stone tied to a string is whirled in a circle, the work done on it by the string is

a) zero

b) negative

c) positive

d) undefined