R4RIN – MCQs, Mock Tests | ECAT ECAT Physics Work And Energy Mcqs Questions

Work done will be maximum if the angle between the force F and displacement d is

1. 45?
2. 90?
3. 180?
4. 0?

✅ Correct Answer: 4

A field in which the work done in a moving a body along closed path is zero is called

1. electric field
2. conservative field
3. electromagnetic field
4. gravitational field

✅ Correct Answer: 2

When a force is parallel to the direction of motion of the body then work done on the body is

1. zero
2. minimum
3. infinity
4. maximum

✅ Correct Answer: 4

Which of the following types of force can do no work on the particle on which it acts?

1. frictional force
2. gravitational force
3. elastic force
4. centripetal force

✅ Correct Answer: 4

If a body a mass of 2 kg is raised vertically through 2m then the work done will be

1. 38.2 J
2. 392.1 J
3. 39.2 J
4. 3.92 J

✅ Correct Answer: 3

An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction the work done is

1. 3.5 x 103 J
2. 3.5 x 104 J
3. 3.5 x 106 J
4. 3.5 x 109 J

✅ Correct Answer: 4

The average power and instantaneous power become equal if work is done at

1. any rate
2. at variable rate
3. at uniform rate
4. at high rate

✅ Correct Answer: 3

The relation between horse power and watt is

1. 1 hp = 546 watts
2. 1 hp = 746 watts
3. 1 hp = 1000 watts
4. 1 hp = 946 watts

✅ Correct Answer: 2

Proton electron neutron and a particles have same momentum. Which of them have highest K.E?

1. Proton
2. electron
3. neutron
4. a-particle

✅ Correct Answer: 2

Slope of work time graph is equal to

1. displacement
2. acceleration
3. power
4. energy

✅ Correct Answer: 3

Work done by variable force is determine by dividing

1. force into small interval
2. displacement into small interval
3. both force and displacement into small intervals
4. force into small and displacement into large intervals

✅ Correct Answer: 2

Work done on the body equals to the

1. change in its K.E always
2. change in its P.E always
3. change in its K.E and change in its P.E
4. neither change in K.E and nor change in its P.E

✅ Correct Answer: 3

The escape velocity of a body in gravitational field of earth is independent of

1. cits mass
2. the angle at which it is thrown
3. both its mass and the angle at which it is thrown
4. gravitational field of earth

✅ Correct Answer: 3

The tides raise the mater in the see roughly in a day

1. once
2. twice
3. four time
4. eight time

✅ Correct Answer: 2

The source of geothermal energy is

1. decay of radioactive element in the earth
2. compression of material in the earth
3. residual lost of the earth
4. all as said in a - b and c

✅ Correct Answer: 4

The highest value of escape velocity in solar system is planet

1. Earth
2. Neptune
3. Jupiter
4. Moon

✅ Correct Answer: 3

Work done by the force of friction is

1. always positive
2. always negative
3. positive only for small frictional force
4. positive only for large frictional force

✅ Correct Answer: 2

Gravitational P.E of a body has

1. no formula
2. a formula mgh only
3. a formula
4. no general formula

✅ Correct Answer: 4

If velocity is doubled then

1. momentum increases 4 times and K.E increases 2 times
2. momentum and K.E. remain same
3. momentum increases 2 times and K.E increases constant
4. momentum increases 2 times and K.E increases 4 time

✅ Correct Answer: 4

One mega watt hour is equal to

1. 36 x 106 J
2. 36 x 1012 J
3. 36 x 109 J
4. 36 x 108 J

✅ Correct Answer: 4

Which of the following is not conservative force

1. friction
2. electric
3. gravitational
4. magnetic

✅ Correct Answer: 1

Work has the dimension as that of same as that of

1. torque
2. angular momentum
3. linear momentum
4. power

✅ Correct Answer: 1

The consumption of energy by a 60 watt bulb in 2 sec is

1. 120 J
2. 60 J
3. 30 J
4. 0.02 J

✅ Correct Answer: 1

The relation between the escape velocity V esc and orbital speed Vo is given by

1. V esc = 1/2Vo
2. V esc = ?2 Vo
3. V esc = Vo
4. V esc = 2Vo

✅ Correct Answer: 2

The escape velocity form the earth surface in km S-1 is

1. 4.2 km S-1
2. 7.5 km S-1
3. 9.5 km S-1
4. 1.1 km S-1

✅ Correct Answer: 4

If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is

1. 1600 ms-1
2. 50.6 ms-1
3. 71.6 ms-1
4. 2263ms-1

✅ Correct Answer: 2

When two protons are brought together

1. Kinetic energy increases
2. P.E. between them increases
3. P.E. between them decreases
4. P.E. between tem does not change

✅ Correct Answer: 2

When arrow is released form its bow its energy is transformed from

1. heat energy to K.E
2. elastic P.E to K.E
3. elemical energy to elastic P.E
4. K.E to elastic P.E.

✅ Correct Answer: 2

A man lifts vertically a weight of 40kg through 1m in 10s; while a chile lifts vertically a weight of 10kg through a distance of 1m in 1s. What will be correct inference?

1. man does more work than child
2. child does more work than man
3. both do the same amount of work
4. it is a foolish question

✅ Correct Answer: 2

The work done by friction is

1. positive
2. negative
3. zero
4. none of these

✅ Correct Answer: 2

The area under the force displacement graph represents

1. area
2. work done
3. power
4. none of these

✅ Correct Answer: 2

The dimension of power is

1. [ML2T-3]
2. [ML2T-2]
3. [ML2T3]
4. none of these

✅ Correct Answer: 1

Propulsion force of a rocket is

1. non-conservative force
2. conservative force
3. both (a) and (b)
4. none of these

✅ Correct Answer: 1

The dot product of force and velocity is

1. power
2. work
3. impulse
4. torque

✅ Correct Answer: 1

Geothermal energy is a ____________________ source of energy.

1. non-renewable
2. stable
3. renewable
4. none of the above

✅ Correct Answer: 3

he source of tidal energy is

1. sun
2. earth
3. both (a) and (b)
4. moon

✅ Correct Answer: 4

________________ cells converts solar energy into electrical energy

1. rotory
2. photovoltaic
3. galvanic
4. none of these

✅ Correct Answer: 2

On a clear day at noon the solar energy reaching the earth is

1. 1.44kw/m2
2. 1.4kw/m2
3. 1 kw/m2
4. none

✅ Correct Answer: 3

Biomass can be converted into fuels by

1. direct combustion
2. fermentation
3. both (a) and (b)
4. none of these

✅ Correct Answer: 3