Question 1

Which of the following is a scalar quantity?

Accepted Answer

Power

Answer

Force

Answer

Velocity

Answer

Acceleration

Question 2

A machine does 1000 J of work in 10 seconds. What is the power output of the machine?

Accepted Answer

100 W

Answer

10000 W

Answer

10 W

Answer

1000 W

Question 3

Which of the following is a unit of power?

Accepted Answer

Watt

Answer

Newton

Answer

Joule

Answer

Pascal

Question 4

A body of mass 10 kg is lifted vertically upwards by a force of 100 N. How much work is done in lifting the body to a height of 5 meters?

Accepted Answer

500 J

Answer

50 J

Answer

1000 J

Answer

100 J

Question 5

A force of 50 N is applied to push an object a distance of 5 meters. How much work is done in pushing the object?

Accepted Answer

250 J

Answer

10 J

Answer

50 J

Answer

500 J

Question 6

Which of the following is an example of kinetic energy?

Accepted Answer

A moving car

Answer

A book on a shelf

Answer

A battery

Answer

A stationary rock

Question 7

Which of the following statements about power is correct?

Accepted Answer

Power is the rate at which work is done or energy is transferred.

Answer

Power is dependent on resistance only.

Answer

Power is independent of time.

Answer

Power is calculated by dividing voltage by current.

Answer

Power is measured in joules.

Question 8

Which of the following is the correct definition of work?

Accepted Answer

The transfer of energy accomplished by the application of a force over a displacement in the direction of the force.

Answer

The distance traveled by an object.

Answer

The amount of force applied to an object.

Answer

The rate at which work is done.

Question 9

Which of the following is the correct formula to calculate work?

Accepted Answer

Work = Force * Distance * cos(theta)

Answer

Work = Power / Time

Answer

Work = Mass * Acceleration

Answer

Work = Force * Time

Question 10

Which of the following is an example of potential energy?

Accepted Answer

A stretched rubber band

Answer

A moving car

Answer

A shining light bulb

Answer

A running athlete

Question 11

Which of the following is a unit of power?

Accepted Answer

Watt

Answer

Newton

Answer

Joule

Answer

Volt

Question 12

Which of the following statements is true about kinetic energy?

Accepted Answer

Kinetic energy depends on both mass and velocity.

Answer

Kinetic energy depends only on mass.

Answer

Kinetic energy depends on neither mass nor velocity.

Answer

Kinetic energy depends only on velocity.

Question 13

Which of the following is an example of a conservative force?

Accepted Answer

Gravity

Answer

Friction

Answer

Electric force

Answer

Air resistance

Question 14

Which of the following is a unit of work?

Accepted Answer

Joule

Answer

Volt

Answer

Newton

Answer

Watt

Question 15

Which of the following statements is true about power?

Accepted Answer

Power is the rate at which work is done or energy is transferred.

Answer

Power depends on the distance traveled by an object.

Answer

Power depends on the angle between force and displacement.

Answer

Power is a measure of the amount of energy possessed by an object.

Question 16

Which of the following is an example of conservation of energy?

Accepted Answer

A pendulum swinging back and forth

Answer

A ball rolling down a hill

Answer

A light bulb emitting light

Answer

A car accelerating uphill

Question 17

Which of the following formulas is used to calculate gravitational potential energy?

Accepted Answer

Gravitational Potential Energy = mass * gravity * height

Answer

Gravitational Potential Energy = force * velocity

Answer

Gravitational Potential Energy = mass * acceleration

Answer

Gravitational Potential Energy = mass * velocity^2 / 2

Question 18

1 Horse Power (HP) = _________ Watt.

Accepted Answer

746

Answer

674

Answer

766

Answer

446

Question 19

An object of mass 200 g moving with velocity 50 cm/s. What is its kinetic energy?

Accepted Answer

2.5 × 10⁵ erg

Answer

2.8 × 10⁵erg

Answer

2.0 × 10⁵ erg

Answer

2.1 × 10⁵ erg

Question 20

A machine does a work of 100 joule in 20 second. What is its power?

Accepted Answer

5 watt

Answer

120 watt

Answer

2000 watt

Answer

80 watt

Question 21

Joule/second is related to –

Accepted Answer

Watt

Answer

Torr

Answer

Newton

Answer

Pascal

Question 22

A particle is thrown upward with some kinetic energy. What happened to its kinetic energy at the highest point or height it reaches.

Accepted Answer

Its kinetic energy is converted to potential energy

Answer

It’s all kinetic energy is absorbed by the air;

Answer

Its kinetic energy is remain same

Answer

Its kinetic energy is lost;

Question 23

Due to application of 5 N force an object moves 10 meter along perpendicular direction of the force. What amount work is done?

Accepted Answer

0 Joule

Answer

150 Joule

Answer

5 Joule

Answer

50 Joule

Question 24

Work done in raising a box on to a platform depends on ____.

Accepted Answer

the height to which it is raised

Answer

strength of the man

Answer

how fast it is raised

Answer

the path through which it is raised

Question 25

With what velocity a student of mass 60 kg run so that his K.E. becomes 270 J

Accepted Answer

3m/s

Answer

20m/s

Answer

10m/s

Answer

2.5m/s

Question 26

How much power is required to lift a body of mass 100 kg to a height of 60 m in 1 minute? Take g = 9.8m/s²

Accepted Answer

980 W

Answer

100 W

Answer

1980 W

Answer

9.8 W

Question 27

The Bullet That Has Fired from a Gun Can Pierce a Target Due to Its __________?

Accepted Answer

Kinetic energy

Answer

Mechanical energy

Answer

Heat energy.

Answer

Acceleration.

Question 28

When the displacement along the opposite direction of the force. Then the work is said to be__________

Accepted Answer

Negative

Answer

Zero

Answer

Infinitive

Answer

Positive

Question 29

Ocean thermal energy is due to

Accepted Answer

Temperature difference at different levels in the ocean

Answer

Energy stored by waves in the ocean

Answer

Pressure difference at different levels in the ocean

Answer

Tides arising out in the ocean

Question 30

In an electric cell while in use, the change in energy is from:

Accepted Answer

Chemical to electrical

Answer

Electrical to Mechanical

Answer

Chemical to mechanical

Answer

Electrical to chemical

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