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Physics MCQ

Work, Power and Energy · ICSE STD 10 (ICSE - English Medium). 30 questions.

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30 questions · timed · auto-graded

MCQ 11 Mark
Assertion (A): When a coolie walks on a horizontal ground while carrying a load on his head, no work is done against the force gravity.
Reason (A): The coolie does work against the force of friction when he moves with load.
  • A
    Both A and R are true and R is the correct explanantion of A .
  • ✓
    Both A and R are true but R is not the correct explanation of A .
  • C
    Assertion is false but reason is true.
  • D
    Assertion is true but reason is false.
Answer
Correct option: B.
Both A and R are true but R is not the correct explanation of A .
B
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MCQ 21 Mark
Assertion (A): In the uniform circular motion, the body is acted upon by a centripetal force, normal to displacement.
Reason (A): In the uniform circular motion, work done by the body is zero.
  • A
    Both A and R are true and R is the correct explanantion of A .
  • ✓
    Both A and R are true but R is not the correct explanation of A .
  • C
    Assertion is false but reason is true.
  • D
    Assertion is true but reason is false.
Answer
Correct option: B.
Both A and R are true but R is not the correct explanation of A .
B
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MCQ 31 Mark
The work done by a fielder when takes a catch in a cricket match is:
  • A
    positive
  • ✓
    negative
  • C
    either (a) or (b)
  • D
    neither (a) nor (b)
Answer
Correct option: B.
negative
B
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MCQ 41 Mark
The energy conversion taking place in a solar cell is
  • A
    from light energy to heat energy
  • B
    from chemical energy to light energy
  • ✓
    from solar (light) energy to electric energy
  • D
    none of these
Answer
Correct option: C.
from solar (light) energy to electric energy
C
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MCQ 51 Mark
The energy conversion taking place in a loud speaker is
  • A
    from light energy to sound energy
  • ✓
    from electric energy to sound energy
  • C
    from sound energy to electric energy
  • D
    none of these
Answer
Correct option: B.
from electric energy to sound energy
B
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MCQ 61 Mark
A boy of mass 40 kg climbs up a flight of 30 steps each 20 cm high in 2 minutes and a girl of mass 30 kg does the same in 1.5 minutes. The ratio of work done by boy and the girl is
  • A
    2:3
  • B
    3:2
  • C
    3:4
  • ✓
    4:3
Answer
Correct option: D.
4:3
D
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MCQ 71 Mark
A girl of mass 50 kg , climbs a flight of 100 stairs each measuring 0.25 m in height. (Take $g =10 ms^{-2}$ ) The work done by the girl is:
  • A
    7,500 J
  • B
    12,000 J
  • ✓
    12,500 J
  • D
    13,000 J
Answer
Correct option: C.
12,500 J
C
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MCQ 81 Mark
A force of 15 N is required to pull up a body of mass 2 kg through a distance 5 m along an inclined plane making an angle of $30^{\circ}$ with the horizontal as shown in the figure. (Take $g =9.8 ms^{-2}$ )
The work done against the force due to gravity is :
Image
  • A
    19.6 J
  • B
    39.2 J
  • ✓
    58.8 J
  • D
    26 J
Answer
Correct option: C.
58.8 J
C
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MCQ 91 Mark
In an electric cell while in use, the change in energy is from
  • A
    electrical to chemical
  • B
    electrical to mechanical
  • ✓
    chemical to electrical
  • D
    chemical to mechanical
Answer
Correct option: C.
chemical to electrical
C
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MCQ 101 Mark
A ball of mass 50 g is thrown vertically upwards with an initial velocity $20 ms^{-1}$. If air friction is neglected, then the maximum height reached is : $\left( g =10 ms^{-2}\right)$
  • A
    5 m
  • B
    10 m
  • C
    15 m
  • ✓
    20 m
Answer
Correct option: D.
20 m
D
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MCQ 111 Mark
A truck driver loads some oil drums into a truck by lifting them directly. Each drum has a mass of 80 kg and platform of the truck is at a height of 0.8 m above the ground. $\left[ g =10 ms^{-2}\right]$ Then what will be the force needed to lift a drum into the truck?
  • A
    600 N
  • ✓
    640 N
  • C
    800 N
  • D
    1000 N
Answer
Correct option: B.
640 N
B
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MCQ 121 Mark
A body, when acted upon by a force of 10 kgf , gets displaced by $0.5 m .\left[ g =10 ms^{-2}\right]$ Then calculate the work done by the force, when the displacement is normal to the force :
  • A
    50 J
  • B
    25 J
  • C
    10 J
  • ✓
    $0$
Answer
Correct option: D.
$0$
D
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MCQ 131 Mark
A pendulum with bob of mass $m$ is oscillating on either side from its resting position $P$ between the extremes $Q$ and $R$ at vertical height $h$ above $P$. On which position of bob, kinetic energy is minimum?
  • A
    At P
  • B
    At Q
  • C
    At R
  • ✓
    Both (b) and (c )
Answer
Correct option: D.
Both (b) and (c )
D
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MCQ 141 Mark
When a force applied in the direction of motion of a body, it is accelerated motion, thus, kinetic energy :
  • ✓
    increases
  • B
    decreases
  • C
    remains same
  • D
    none of these
Answer
Correct option: A.
increases
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MCQ 151 Mark
A crane pulls up a car of mass 500 kg to a vertical height of 4 m . Then work done by the crane is: $\left( g =9.8 ms^{-2}\right)$
  • A
    18000 J
  • B
    18600 J
  • ✓
    19600 J
  • D
    16900 J
Answer
Correct option: C.
19600 J
C
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MCQ 161 Mark
If 1 J of work is done in Is, the power spent is said to be
  • A
    1 HP
  • B
    1 kW
  • ✓
    1 W
  • D
    746 W
Answer
Correct option: C.
1 W
C
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MCQ 171 Mark
On doubling the velocity of a body, its kinetic energy becomes:
  • A
    half
  • B
    twice
  • ✓
    four times
  • D
    none of these
Answer
Correct option: C.
four times
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MCQ 191 Mark
The speed of motor bike changes from $5 ms^{-1}$ to $20 ms^{-1}$. The ratio of initial and final kinetic energies is
  • A
    1:2
  • B
    1:4
  • C
    1:8
  • ✓
    1:16
Answer
Correct option: D.
1:16
D
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MCQ 201 Mark
A man exerts a force of 200 N in pulling a cart at a constant speed of $16 ms^{-1}$. Then the power spent by the man is
  • A
    3000 W
  • ✓
    3200 W
  • C
    3400 W
  • D
    3600 W
Answer
Correct option: B.
3200 W
B
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MCQ 211 Mark
When a flash light is switched on, the electric energy
  • A
    directly changes to light energy
  • B
    first changes to light energy and then to heat energy
  • ✓
    first changes to heat energy and then to light energy
  • D
    none of these
Answer
Correct option: C.
first changes to heat energy and then to light energy
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MCQ 221 Mark
If a body of mass 100 g and having a momentum of 20 $kgms ^{-1}$, then its kinetic energy is
  • A
    1000 J
  • B
    1500 J
  • ✓
    2000 J
  • D
    2500 J
Answer
Correct option: C.
2000 J
C
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MCQ 231 Mark
A body of mass 4 kg is moving with a velocity of $4 ms^{-1}$. If its mass is doubled and velocity is tripled, then the ratio of its initial and final kinetic energy will be
  • A
    1:3
  • B
    1:6
  • C
    1:9
  • ✓
    1:18
Answer
Correct option: D.
1:18
D
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MCQ 241 Mark
An energy of 4 kJ causes a displacement of 64 m in 2.5s. Then force and power are
  • ✓
    62.5 N and 1600 W
  • B
    6.25 N and 160 W
  • C
    625 N and 1600 W
  • D
    62.5 N and 160 W
Answer
Correct option: A.
62.5 N and 1600 W
A
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MCQ 251 Mark
A body capable of doing work is said to possess:
  • A
    power
  • B
    capacity
  • ✓
    energy
  • D
    none of these
Answer
Correct option: C.
energy
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MCQ 261 Mark
The power spent by a source is measured as the amount of work done by the source in:
  • A
    a given time
  • B
    seconds
  • ✓
    one second
  • D
    none of these
Answer
Correct option: C.
one second
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MCQ 271 Mark
If the displacement is normal to the direction of force, then work done is:
  • A
    positive
  • B
    negative
  • ✓
    zero
  • D
    none of these
Answer
Correct option: C.
zero
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MCQ 281 Mark
The SI unit of power is watt. It is expressed in terms of mass, length and time as:
  • ✓
    $kgm ^2 s^{-3}$
  • B
    $kgms ^{-3}$
  • C
    $kg ^2 m^2 s^{-2}$
  • D
    $kgms ^{-2}$
Answer
Correct option: A.
$kgm ^2 s^{-3}$
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MCQ 291 Mark
The SI unit of work is joule. It is expressed in terms of mass, length and time as:
  • A
    $kgm ^2 s^{-3}$
  • B
    $kgm ^3 s^{-2}$
  • C
    $kg ^2 m^2 s^{-2}$
  • ✓
    $kgm ^2 s^{-2}$
Answer
Correct option: D.
$kgm ^2 s^{-2}$
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MCQ 301 Mark
A pendulum is oscillating freely. Its bob has:
  • A
    only kinetic energy
  • B
    maximum kinetic energy at extreme position
  • C
    maximum potential energy at its mean position
  • ✓
    a constant energy, which is the sum of potential and kinetic energy
Answer
Correct option: D.
a constant energy, which is the sum of potential and kinetic energy
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