Questions & Answers: "Work and Energy"
Complete guide to "Work and Energy" for Physics students. Below you will find important questions and model answers to help you prepare.
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We are building a dedicated quiz for this topic, but you can test your skills on a similar concept: NCERT-IX Gravitation: Practice Set 1.
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9 QuestionsWhen a body falls freely towards the earth, then its total energy
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increases
decreases
remains constant
first increases and then decreases
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
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does not change
becomes twice to that of initial
becomes 4 times that of initial
becomes 16 times that of initial
In case of negative work, the angle between the force and displacement is
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0°
45°
90°
180°
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same
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acceleration
momenta
potential energy
kinetic energy
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g =10 m s⁻²)
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6 × 10³ J
6 J
0.6 J
zero
Which one of the following is not the unit of energy?
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joule
newton meter
kilowatt
kilowatt hour
The work done on an object does not depend upon the
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displacement
force applied
angle between force and displacement
initial velocity of the object
Water stored in a dam possesses
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no energy
electrical energy
kinetic energy
potential energy
A body is falling from a height h. After it has fallen a height h/2 , it will possess
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only potential energy
only kinetic energy
half potential and half kinetic energy
more kinetic and less potential energy