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

Question : 11 [SSC CGL]

The sum of the change in kinetic and potential energy is always

a) Negative

b) Positive

c) Zero

d) None of the above

Question : 12

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

a) length = 200 cm, diameter = 2 mm

b) length = 50 cm, diameter = 0.5 mm

c) length = 100 cm, diameter = 1 mm

d) length = 300 cm, diameter = 3 mm

Question : 13 [UP UDA/LDA (Pre) 2010]

As the train starts moving, the head of the passenger sitting inside leans backward because of

a) Moment of Inertia

b) Inertia of Motion

c) Inertia of Rest

d) Conservation of Mass

Question : 14

Consider the following two statements:

1. Linear momentum of a system of particles is zero.
2. Kinetic energy of a system of particles is zero.

a) 1 implies 2 and 2 implies 1.

b) 1 implies 2 but 2 does not imply 1.

c) 1 does not imply 2 but 2 implies 1.

d) 1 does not imply 2 and 2 does not imply 1.

Question : 15

1 kilowatt hour is equal to

a) 36 joule

b) 100 joule

c) 1 joule

d) 3.6 × 10³ kilo joule