Energy - ICSE STD 8 PHYSICS Questions - Vidyadip

Question types

Energy question types

85 questions across 7 question groups — pick any mix to generate a PHYSICS paper with step-by-step answer keys.

85

Questions

7

Question groups

5

Question types

MCQ

[1 Mark Question Answer]

[2 Mark Question Answer]

[3 Mark Question Answer]

[5 Mark Question Answer]

fill in the blanks.

TRUE / FALSE

Sample Questions

Energy questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark

A boy lifts a luggage from height $2 m$ to $4 m.$ The potential energy will become

A
half
✓
double
C
one$-$third
D
one$-$fourth

Answer: B.

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Q 2MCQ1 Mark

When a boy doubles his speed, his kinetic energy becomes

A
half
B
double
✓
four times
D
no change

Answer: C.

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Q 3MCQ1 Mark

$1\ \text{H.P}$. is equal to

A
$1 W$
B
$1 J$
C
$746 j$
✓
$746 W$

Answer: D.

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Q 4MCQ1 Mark

The expression of power $P$ is

A
$P=m g h$
B
$P=P=1 / 2 \ M v^{2 v}$
C
$P=F \times d$
✓
$P = F \times d / t$

Answer: D.

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Q 5MCQ1 Mark

Two coolies $A$ and $B$ do some work in time $1$ minute and $2$ minute respectively. The power spent is

A
same by both coolies
✓
is more by coolie $A$ than by $B$
C
is less by coolie $A$ than by $B$
D
nothing can be said.

Answer: B.

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Q 6[1 Mark Question Answer]1 Mark

State the energy changes in the following while using an electric motor.

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Q 7[1 Mark Question Answer]1 Mark

State the energy changes in the following while using a microphone.

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Q 8[1 Mark Question Answer]1 Mark

State the energy changes in the following while in use A loudspeaker .

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Q 9[1 Mark Question Answer]1 Mark

State the energy changes in the following while in use An electric oven.

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Q 10[1 Mark Question Answer]1 Mark

State the energy changes in the following while in use An electric bulb.

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Q 11[2 Mark Question Answer]2 Marks

State two factors on which the work done on a body depends.

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Q 12[2 Mark Question Answer]2 Marks

State the $\text{S.I.}$ unit of work and define it.

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Q 13[2 Mark Question Answer]2 Marks

The moon is revolving around the earth in a circular path. How much work is done by the moon?

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Q 14[2 Mark Question Answer]2 Marks

A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? Give reason for your answer.

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Q 15[2 Mark Question Answer]2 Marks

In which of the following cases is work being done :
$(a)$ A boy pushing a rock
$(b)$ A boy climbing up the stairs
$(c)$ A coolie standing with a box in his head
$(d)$ A girl moving on the road.

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Q 16[3 Mark Question Answer]3 Marks

Write the expression for work done by a force.

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Q 17[3 Mark Question Answer]3 Marks

State two conditions when no work is done by a force.

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Q 18[3 Mark Question Answer]3 Marks

Give an example to show the conversion of potential energy to kinetic energy when put in use.

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Q 19[3 Mark Question Answer]3 Marks

A cyclist doubles his speed. How will his kinetic energy change : increase, decrease or remain same?

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Q 20[3 Mark Question Answer]3 Marks

Define the term kinetic energy. Give one example of a body which possesses kinetic energy.

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Q 21[5 Mark Question Answer]5 Marks

Two toy$-$cars $A$ and $B$ of masses $200 g$ and $500 g$ respectively are moving with the same speed. Which of the two has greater kinetic energy?

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Q 22[5 Mark Question Answer]5 Marks

Give one example of a body that has potential energy, in each of the following:
$a.$ due to its position at a height.
$b.$ due to its elongated stretched state.

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Q 23[5 Mark Question Answer]5 Marks

Match the following

column $A$	Column $B$
A stone at a height	power
A Moving ball	joule
Energy	work done in $1 s$
Power	potential energy
Watt	kinetic energy

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Q 24fill in the blanks.1 Mark

$1\ \text{H.P.} = .........$

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Q 25fill in the blanks.1 Mark

The $\text{S.I}.$ unit of power is $.........$

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Q 26fill in the blanks.1 Mark

Power $P= ......... /$ times taken.

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Q 27fill in the blanks.1 Mark

Kinetic energy $= 1/2 ×$ mass $× ............$

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Q 28fill in the blanks.1 Mark

Gravitational potential energy $U =$ mass $\times $ force of gravity on unit mass $\times ..........$

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Q 29TRUE / FALSE1 Mark

Power spent by a body depends on the time for which it does work.

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Q 30TRUE / FALSE1 Mark

Work done by a boy depends on the time in which he does work.

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Q 31TRUE / FALSE1 Mark

The energy of a flying kite is kinetic energy.

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Q 32TRUE / FALSE1 Mark

The energy stored in water of a dam is the kinetic energy.

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Q 33TRUE / FALSE1 Mark

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

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