mechanics (mass, force, acceleration, work, energy, momentum, velocity) - Category wise Question and Answer Practice Test with Solutions

Question : 11

Consider the following statements :

1. A person standing for a long time with a suitcase on his head does no work in terms of physics.
2. There cannot be any displacement of an object in the absence of any force acting on it.
3. The law of conservation of energy is valid in all situations and for all kinds of transformations.

a) 2 and 3

b) 1 and 2

c) 1 and 3

d) 1, 2 and 3

Question : 12

Which of the following time-displacement graph is not possible in nature?

a)

b)

c)

d)

Question : 13 [PSC (Pre) 2017]

Consider the following statements.
A 4-wheel vehicle moving in a sharp circular path at high speed will

1. Overturn about its outer wheels
2. Overturn about its inner wheels
3. Skid outwards
4. Skid inwards

a) 2 and 3

b) 2 and 4

c) 1 and 3

d) 1 and 4

Question : 14 [NDA]

For a particle revolving in a circular path, the acceleration of the particle is

a) zero

b) along the radius

c) along the tangent

d) along the circumference of the circle

Question : 15 [MPPCS (Pre) 2000]

Energy conservation means

a) Energy could not be created but destroyed

b) Energy could be created

c) Generation and destruction of energy

d) Energy can neither be created nor destroyed