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work and energy test

Last updated over 5 years ago
10 questions
1

The potential energy of a freely falling object decreases
progressively. Does this violate the law of conservation of
energy? Why?

1

A certain household has consumed 250 units of energy during
a month. How much energy is this in joules?

2

3. In case of negative work the angle between the force and displacement is
(a) 00
(b) 450
(c) 900
(d ) 1800

1

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same
(a) acceleration
(b) momenta
(c) potential energy
(d) kinetic energy

1

A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g =10 m s–2)
(a) 6 ×103 J
(b) 6 J
(c) 0.6 J
(d) zero

1

Which one of the following is not the unit of energy?
(a) joule
(b) newton metre
(c) kilowatt
(d) kilowatt-hour

1

Water stored in a dam possesses
(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy

1

Can any object have mechanical energy even if its momentum is zero? Explain.

1

If an electric iron of 1200 W is used for 30 minutes everyday, find electric energy consumed in the month of Apri

1

Draw the graph for uniform and non uniform motion