WorksheetsWork and Energy
Total questions: 25
Worksheet time: 15mins
When a body falls freely towards the earth, then its total energy
first increases and then decreases
remains constant
decreases
increases
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
becomes 16 times that of initial
becomes 4 times that of initial
becomes twice to that of initial
does not change
In case of negative work the angle between the force and displacement is
0
90
180
45
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
kinetic energy
potential energy
momenta
acceleration
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 )
6 ×103 J J
6 J
0.6 J
Zero
Which one of the following is not the unit of energy?
kilowatt hour
kilowatt
newton metre
joule
The work done on an object does not depend upon the
initial velocity of the object
angle between force and displacement
force applied
displacement
Water stored in a dam possesses
potential energy
kinetic energy
electrical energy
no energy
A body is falling from a height h. After it has fallen a height h/2 , it will possess
more kinetic and less potential energy
half potential and half kinetic energy
only kinetic energy
only potential energy
Which requires more work: a person walking up stairs or a person running up stairs?
walking
running
they require equal work
no work is required for either because the movement is vertical
When the velocity triples, the kinetic energy increases by ______ times.
9
3
1.5
4.5
A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s. What will be the work done?
50 J
60 J
20 J
45 J
What does work equal when the final change in kinetic energy equals 20,000 J?
0 J
20,000 J
2041 J
4164931 J
Which situation is work not done?
lifting a 20 pound box off the floor
holding a 20 pound box above the floor
sliding a 20 pound box across the floor
sliding a 20 pound box up an inclined plane
A box is pushed by 20 N force to the right and displace for 0.1 m. What is the work done?
0.005 J
0.1 J
1 J
2 J
Elections in India for Parliament and State Legislatures are conducted by
President
Prime Minister
Governor
Election Commission of India
Members of Election Commission are appointed by
President of India
Prime Minister of India
Elected by the people
Chief Justice of India
What is the minimum age to contest the elections in India?
18
22
25
29
