Work and Energy

Work and Energy
When angle between force and displacement is 90 ° then work done is
0 J
1 J
10 J
50 J
Author: rikazzz Comment
Work and Energy
The energy that causes water to evaporate from the surface to form water vapors is known as
electrical energy
thermal energy
chemical energy
heat energy
Author: rikazzz Comment
Work and Energy
A bus weighing 12kN has speed of 20 ms^-1. Its kinetic energy is
210 kJ
230 kJ
240 kJ
250 kJ
Author: rikazzz Comment
Work and Energy
If a box is pulled by a rope making an angle with the surface then the horizontal component of force is equal to
F sinθ
F cosθ
F tanθ
F theta&sin
Author: rikazzz Comment
Work and Energy
A boy has pulled a cart through 40 m applying a force of 200 N. The work done by him is
7500 J
8000 J
5000 J
9000 J
Author: rikazzz Comment
Work and Energy
Natural processes such as volcanic eruptions, forest fires causes
water pollution
nuclear pollution
traffic pollution
air pollution
Author: rikazzz Comment
Work and Energy
When a body is lifted through a height h, the work done on it appears in the form of its
kinetic energy
potential energy
chemical energy
geothermal energy
Author: rikazzz Comment
Work and Energy
An body builder does 15 Joules of useful work from every 60 Joules of food energy which he takes. His efficiency will be
0.15
0.25
0.3
0.35
Author: rikazzz Comment
Work and Energy
A force of 250 N acts on a body of mass 30 kg. If velocity is 50 ms^-1. The distance will be
200 m
120 m
100 m
130 m
Author: rikazzz Comment
Work and Energy
The energy coming from the sun for the last billion years is the result of a
heat reactions
nuclear reactions
molecular reactions
potential reaction
Author: rikazzz Comment

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