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Class 9 Science
Work And Energy
Quiz 3
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A rubber band has more potential energy when wrapped around a packet than when it was lying unused
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True
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False
A ball is thrown upwards from a point A. it reaches up to the highest point B and returns.
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Potential energy at A = kinetic energy at A
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Kinetic energy at A = kinetic energy at B
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Potential energy at A = potential energy at B
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Potential energy at A = kinetic energy at B
When the speed of a particle is doubled, the ratio of its kinetic energy to its momentum
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becomes 4 times
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gets doubled
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remains the same
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becomes half
The work done by the weight of a 1-kg mass while it moves up through 1 m is
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\(\frac{1}{9.8}J\)
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\(-9.8J\)
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\(-\frac{1}{9.8}J\)
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\(9.8J\)
When a body falls, its kinetic energy remains constant.
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True
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False
A man with a box on his head is climbing up a ladder. The work done by the man on the box is
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negative
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zero
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positive
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undefined
When an aero plane takes off, the work done by its weight is positive.
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True
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False
In which of the following cases is the potential energy of a spring minimum?
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When it is at its natural length but is kept at a height \(h\) above the ground
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When it is compressed
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When it is extended
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When it is at its natural length
A particle of mass 100 g moves at a speed of 1 m/s. Its kinetic energy is
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50 J
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0.05J
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5 J
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0.5 J
Two bodies of unequal masses are dropped from a cliff. At any instant, they have equal
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acceleration
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Kinetic energy
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potential energy
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momentum
A porter with a suitcase on his head is climbing up a flight of stairs with a uniform speed. The work done by the ‘weight of the suitcase’ on the suitcase is
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positive
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undefined
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negative
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zero
When negative work is done by external forces on a system, the energy of the system decreases.
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True
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False
The unit of power is
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Kg
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Watt
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Joule
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Newton
The potential energy of a spring increases when it is extended and decreases when it is compressed.
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True
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False
A person A does \(500 \, J\) of work in 10 minutes and another person B does \(600\, J\) of work in 20 minutes. Let the power delivered by A and B be \(P_{1\) and \(P_2\) respectively. Then,
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\(P_1=P_2\)
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\(P_1
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\(P_1\)and \(P_2\) are undefined
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\(P_1>P_2\)
The number of joules contained in 1 kWh is
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36 × 10J
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3. 6 × 10J
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37 × 10J
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3. 7 × 10J
Explanation
36 × 10J
0 h : 0 m : 1 s
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