04: Energy Class 8 Physics : Icse-viii-physics

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ICSE-VIII-Physics

04: Energy Class 8 Physics

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Section : A
Objective Questions

Qstn #1
Write true or false for each statement

#1-a
A coolie does no work against the force of gravity while carrying a luggage on a road.

Ans :
True

#1-b
The energy stored in water of a dam is the kinetic energy.

Ans :
False
The energy stored in water of a dam is the potential energy.

#1-c
The energy of a flying kite is kinetic energy.

Ans :
True.

#1-d
Work done by a boy depends on the time in which he does work.

Ans :
False.

#1-e
Power spent by a body depends on the time for which it does work.

Ans :
True.

Qstn #2
Fill in the blanks

#2-a
Work is said to be done by a forte only when ____
Ans : Work is said to be done by a forte only when the body moves.

#2-b
Work done = Force × ____
Ans : Work done = Force × distance moved in direction of force.

#2-c
The energy of a body is its capacity to do ____
Ans : The energy of a body is its capacity to do work.

#2-d
The S.I. unit of energy is ____
Ans : The S.I. unit of energy is joule.

#2-e
The potential energy of a body is due to its _____ and kinetic energy of body is due to its _____
Ans : The potential energy of a body is due to its state of rest or position and kinetic energy of body is due to its state of motion.

#2-f
Gravitational potential energy U = mass × force of gravity on unit mass × ____
Ans : Gravitational potential energy U = mass × force of gravity on unit mass × height.