set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Kepler’s second law (law of area) is nothing but a statement of

a) conservation of angular momentum

b) conservation of linear momentum

c) work energy theorem

d) conservation of energy

Question : 2

The working principle of a washing machine is

a) Reverse osmosis

b) Dialysis

c) Centrifugation

d) Diffusion

Question : 3

Rahul takes 1 minute to raise a box to a height of 1 metre and Rohan takes 1/2 minute to do so. Comment on the energy by the two.

a) Energy spent by the Rohan is more

b) Energy spent by both Rahul and Rohan is same.

c) Energy spent by the Rahul is more.

d) Cannot be said

Question : 4

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 : 5

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 : 6

Force is the product of

a) Weight and velocity

b) Mass and acceleration

c) Mass and velocity

d) Weight and acceleration