set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Force is the product of

a) Weight and velocity

b) Mass and acceleration

c) Mass and velocity

d) Weight and acceleration

Question : 2

The force exerted by the floor of an elevator on the foot of a person standing there, is more than his weight, if the elevator is

a) going up and slowing down

b) going up and speeding up

c) going down and slowing down

d) either (a) or (b)

Question : 3

Assertion (A):
A man standing on a completely frictionless surface can propel himself by whistling.
Reason (R) :
If no external force acts on a system, its momentum cannot change.

a) A is true but R is false

b) Both A and R are true but R is not a correct explanation of A

c) Both A and R are true and R is the correct explanation of A

d) A is false but R is true

Question : 4

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 : 5

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 : 6

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