1.
The work done by a weight of 1 kg mass when it moves up through 1m is
2.
A stone is tied to a string and the whirled in a circle. The work done on it by the sting is
3.
When a force retards the motion of body, the work done is
4.
The force done by a body will be positive if the
5.
A coolie with a suitcase on his head is climbing up on a ladder with uniform speed. The work done by the coolie
6.
A body of mass 1 kg has a kinetic energy of 1 J when its speed is
7.
Kinetic energy of a body depends
8.
A particle of mass 100 gm moves with a speed of 1m/s. its kinetic energy is
9.
The speed of a particle is doubled its kinetic energy
10.
Two bodies have their masses m1/m2=3/1 and their kinetic energies E1/E2=1/3. The ratio of their velocities are
11.
Potential energy of a person is minimum when
12.
When a stone falls through a vertical height h, the decrease in the gravitational energy is
13.
A boy of mass 5kg falls through a height of 5m. the loss in potential energy of the mass is
14.
A body of mass 2 kg is projected vertically upwards with a speed of 3 m/s. the maximum gravitational potential energy of the body is
15.
A body is thrown upwards from a point A. it reaches up to the highest point B and returns. Its
16.
An electric motor creates a tension of 4500N in hoisting a cable and reels at a rate of 2m/s. the power of the motor is
17.
An engine develops a power of 10kw. How much time will it take to lift a mass of 200 kg to a height of 40m?
18.
A person does 500J of work in 10min and another person B works 600 J in 20 minutes. Let the power delivered by A and B be P1 and P2 respectively. Then
19.
The power is expressed as
21.
Commercial unit of energy is
22.
Potential energy of a body depends on its
24.
Work done by friction
25.
When a coil spring is compresses, work is done on the spring. The elastic potential energy
26.
What is the relation between momentum and kinetic energy?
27.
If speed of a car becomes 2 times, its kinetic energy becomes
28.
The number of joules contained in 1 kWh is
29.
Two army persons A and B each of weight of 500 N climb up a rope through a height of 10m. A takes 20 s while B takes 40 s to achieve this task. What is ratio of the power of person A and B?
30.
Water store in a dam possesses
31.
A body is falling from height h. after it has fallen a height h/2, it will possess
32.
Which one of the following is not the unit of energy?
33.
The work done on an object doesn’t depend upon the
34.
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
35.
A girl carrying a school bag of 3 kg mass on her back and moves 200m on a levelled road. The work done against the gravitational force will be
36.
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
37.
In case of negative work the angle between the force and displacement
38.
When a body falls freely towards the earth, then its total energy
39.
What are the various factors affecting kinetic energy?
40.
When two identical bodies are in motion, the body with a higher velocity has
41.
The sum of kinetic energy and potential energy is
42.
A bullet of mass A and velocity B is fired into a wooden block of mass C. if the bullet gets embedded in the wooden block, then the magnitude of velocity of the system just after the collision will be
43.
The masses of two bodies are in ratio 5:6 and their velocities are in ratio 1:2. Then their linear momentum will be in the ratio
44.
Inertia is the property of a body by virtue of which, it cannot change by itself
45.
An athlete does not come to rest immediately after crossing the winning line due to the
46.
When a body falls freely towards the earth , then its total energy
47.
When we stop pedalling, the bicycle begins to slow down. This is because of the
48.
A spring toy works on
49.
Which of the following is not an application of conversation of linear momentum?
50.
When a body falls freely towards the earth, then its total energy
