Free Printable Chapter 5: Work, Energy & Power

1.

The work done is zero if

a)

The body shows displacement in the opposite direction of the force applied.

b)

The body shows a displacement in perpendicular direction to the force applied.

c)

The body shows displacement in the same direction as that of the force applied.

d)

The body masses obliquely to the direction of the force applied.

2.

The unit of work is joule. The other physical quantity that has same unit is

a)

Power

b)

Velocity

c)

Energy

d)

Force

3.

A ball is dropped from a height of 10 m

a)

Its potential energy increases and kinetic energy decreases during the falls

b)

Its potential energy is equal to the kinetic energy during the fall.

c)

The potential energy decreases and the kinetic energy increases during the fall.

4.

"the work done by the net force on a body equals the change in the body’s kinetic energy" this is the statement for?

a)

Power

b)

Energy

c)

Work done

d)

Work Energy Theorem

5.

Which of the following is the equation of power (can tick more than 1)

a)

$P\ =F\ \cdot s$

b)

$P\ =\ F\ \cdot v$

c)

$P\ =\frac{E}{t^2}$

d)

$P\ =\ \frac{E}{t\ }$

6.

Area under the curve of force-displacement graph is equal to

a)

Displacement

b)

Work

c)

Power

d)

Energy

7.

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

a)

$45\degree$

b)

$90\degree$

c)

$180\degree$

d)

$0\degree$

8.

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

a)

Zero

b)

Minimum

c)

Infinity

d)

Maximum

9.

The work done is said to be negative when force and displacement are

a)

Parallel

b)

Anti-parallel

c)

Perpendicular

d)

None

10.

Work done on the body equals to the

a)

Change in its K.E always

b)

Change in its P.E always

c)

Change in it K.E and change in its P.E

d)

Neither change in K.E nor change in its P.E

11.

Work done by the force of friction is

a)

Always positive

b)

Always negative

c)

Positive only for small frictional force

d)

Positive only for large frictional force

12.

The consumption of energy by 60 watt bulb in 2 seconds is:

a)

$20\ J$

b)

$120\ J$

c)

$30\ J$

d)

$0.02\ J$

13.

Power is also defined as dot product of

a)

Force and displacement

b)

Force and mass

c)

Force and velocity

d)

Force and time

14.

The work done by the force of 10N applied parallel to direction of motion up to 20 m

a)

$10\ J$

b)

$20\ J$

c)

$200\ J$

d)

$2000\ J$

15.

The SI unit of power is

a)

Joule

b)

Horsepower

c)

$kWh$

d)

Watts

16.

The energy stored in the spring of a watch is

a)

K.E

b)

Electrical Energy

c)

Elastic P.E

d)

Solar Energy

17.

Work-energy equation can be expressed as:

a)

$Fa\ =\ K.E_f\ -\ K.E_i$

b)

$ma\ =\ \left(K.E_f\right)^2-\left(K.E_i\right)^2$

c)

$Fd\ =\ K.E_f\ -K.E_i$

d)

$F.V\ =\ K.E_f\ -\ K.E_i$

18.

Choose the wrong statement.

a)

Work Done is a scalar quantity

b)

Work depends on the time taken to complete the work

c)

Work done can never be zero

d)

SI unit of work is joule

19.

The speed of an object is doubled. Its kinetic energy is therefore:

a)

The same

b)

Double

c)

Tripled

d)

Quadrupled

20.

If mass of a moving object is doubled, its K.E becomes:

a)

2 times

b)

4 times

c)

5 times

d)

16 times

21.

Kinetic energy depends on

a)

mass and height

b)

mass and speed

c)

height and speed

d)

mass and force

22.

Work-energy theorem can be expressed as

a)

$Fa\ =\ K_{final}\ -\ K_{initial}$

b)

$ma\ =\ \ K_{final}\ -\ K_{initial}$

c)

$Fs\ =\ K_{final}\ -\ K_{initial}$

d)

$F\ v\ =\ \ K_{final}\ -\ K_{initial}$

23.

Instantaneous power is defined as dot product of

a)

Force and displacement

b)

Force and mass

c)

Force and velocity

d)

Force and time

24.

Which of the following statements is TRUE about work?

a)

Work is a vector quantity.

b)

S.I unit for work is kg m² s⁻¹.

c)

Work is defined as cross product between force and displacement of an object.

d)

No work is done when there is no motion or when the force is perpendicular to motion.

25.

The speed of an object is doubled. Its kinetic energy is therefore

a)

The same

b)

Doubled

c)

Tripled

d)

Quadrupled

26.

What happens to the kinetic energy of a moving object if the net work done is positive?

a)

The kinetic energy increases.

b)

The kinetic energy decreases

c)

The kinetic energy remains the same.

d)

The kinetic energy is zero.

27.

The rate in which work is done is equivalent to

a)

Force

b)

Power

c)

Kinetic energy

d)

Work

28.

With no air resistance and no friction, a pendulum would

a)

Not swing

b)

Swing for a short time

c)

Swing forever

d)

Break

29.

An object of mass M, being pushed to a distance along a horizontal surface. What is the work done by gravity?

a)

$-Mgd$

b)

$Zero$

c)

$Mgd$

d)

$Fd$

30.

In which of these cases is work being done?

a)

A student sleeps

b)

A student pushes a locked door that does not move

c)

A student carries his chair into another room

d)

A student sits on the carpet

Chapter 5: Work, Energy & Power

Total questions: 30

Worksheet time: 3600secs

Similar Resources on Wayground