Question 1
1 Mark
When a body falls freely towards the earth, then its total energy
Options
Option A
increases
Option B
decreases
Option C is correct
remains constant
Option D
first increases and then decreases
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.
9 Questions
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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.
Question 2
1 Mark
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
Options
Option A is correct
does not change
Option B
becomes twice to that of initial
Option C
becomes 4 times that of initial
Option D
becomes 16 times that of initial
Question 3
1 Mark
In case of negative work, the angle between the force and displacement is
Options
Option A
0°
Option B
45°
Option C
90°
Option D is correct
180°
Question 4
1 Mark
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
Options
Option A is correct
acceleration
Option B
momenta
Option C
potential energy
Option D
kinetic energy
Question 5
1 Mark
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)
Options
Option A
6 × 10³ J
Option B
6 J
Option C
0.6 J
Option D is correct
zero
Question 6
1 Mark
Which one of the following is not the unit of energy?
Options
Option A
joule
Option B
newton meter
Option C is correct
kilowatt
Option D
kilowatt hour
Question 7
1 Mark
The work done on an object does not depend upon the
Options
Option A
displacement
Option B
force applied
Option C
angle between force and displacement
Option D is correct
initial velocity of the object
Question 8
1 Mark
Water stored in a dam possesses
Options
Option A
no energy
Option B
electrical energy
Option C
kinetic energy
Option D is correct
potential energy
Question 9
1 Mark
A body is falling from a height h. After it has fallen a height h/2 , it will possess
Options
Option A
only potential energy
Option B
only kinetic energy
Option C is correct
half potential and half kinetic energy
Option D
more kinetic and less potential energy