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MCQ Questions for CBSE Class 12 with Answers
MCQ Questions for CBSE Class 11 with Answers
MCQ Questions for CBSE Class 10 with Answers
MCQ Questions for CBSE Class 9 with Answers
MCQ Questions for CBSE Class 8 with Answers
MCQ Questions for CBSE Class 7 with Answers
MCQ Questions for CBSE Class 6 with Answers
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MCQ Questions for CBSE Class 4 with Answers
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Work Power and Energy Class 7 MCQ Questions With Answers
1.
Check all of the things that can affect power
Work
Time
Force
All of above
2.
When you rub your hands together on a cold day, you use friction to convert
Mechanical energy into thermal energy
Thermal energy into nuclear energy
Chemical energy into mechanical energy.
Electrical energy into thermal energy
3.
A soccer player kicks a ball with 20 Newtons of force causing it to travel 100 meters. How much work is done on the ball?
200 J
80 J
5 J
2000 J
4.
A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has she done?
600 J
450 J
900 J
1200 J
5.
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
272 m
17 m
4.05 m
272 cm
6.
You move a 8 N object five meters in 4 seconds. How much power have you generated?
160 watts
10 watts
6.4 watts
17 watts
7.
This picture shows an example of what type simple machine?
pulley
wedge
lever
wheel and axle
8.
The sun provides ____________ and ____________ energy that can be harnessed and used for solar power.
chemical, sound
mechanical, light
sound, light
light, thermal
9.
What type of energy do we use to cook food?
mechanical
radiant
thermal
kinetic
10.
You do 90 joules of work in 30 seconds. How much power have you generated?
30 watts
3 watts
120 watts
270 watts
11.
Which statement illustrates work done?
A weightlifter holds a barbell above her head.
A teacher applies a continuous force to a book, holding it flat.
A student flicks a paper football and moves it over the edge of a table.
A waiter carries a tray full of meals while listening to a customer.
12.
How can you decrease the effort force needed to push a weight to the top of the ramp?
cover the surface with carpet
increase the length of the ramp
increase the height of the ramp
decrease the length of the ramp
13.
At which point on the roller coaster is the kinetic energy at its maximum?
A
B
C
D
14.
The amount by which a machine multiplies input force is known as the
work.
power.
output force.
mechanical advantage.
15.
A student with a mass of 62 kg walks up a flight of stairs with a height of 3.4 meters. How can he decrease his power?
walk slower
walk faster
carry his friends books
All of above
16.
A roller coaster whose average speed is 32 m/s is at the top of a 72m hill and weighs 966N. At the top of the hill the coaster car has ___________________ energy.
almost all kinetic energy
almost all potential energy
mostly kinetic energy
some kinetic and some potential energy
17.
50 J of work is done lifting a 20.0 N book in the air. How high was it lifted?
2.5 m
3.5 m
0.4 m
25 m
18.
Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?
100 watts
400 watts
104 watts
50 watts
19.
Simple machines make work easier by increasing what?
The distance over which work is done
The force needed to do work
The time required to do work
The acceleration of a massive object
20.
This is energy that is stored for later use.
kinetic energy
potential energy
mechanical energy
radiant energy
21.
What type of simple machine is a bike pedal?
Inclined Plane
Pulley
Wedge
Lever
22.
Light is an example of _________
thermal energy
radiant energy
mechanical energy
nuclear energy
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