Work and Energy Test

Result

Work and Energy Test - 6

Score
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Weekly Quiz Competition

Question 1
1 / -0

How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?

A
200 J

B
0.02 J

C
0.2 J

D
20 J
Question 2
1 / -0

Work done on a body moving along a circular path is

A
FS joule

B
0 joule

C
- FS joule

D
None of these
Question 3
1 / -0

In which of the following cases is work being done?

A
A donkey carrying a load on its back.

B
Foodgrain being dried in the sun.

C
Rahul is swimming in a pond.

D
A green plant is carrying out photosynthesis.
Question 4
1 / -0

How much force is required to do 9600 J of work over a displacement of 25 m?

A
240 KN

B
9.6 KN

C
384 N

D
250 N
Question 5
1 / -0

What must be the velocity (in ms^-1) of a moving body of mass 2 kg, which possess a kinetic energy of 16 J?

A
2

B
3

C
4

D
None of these
Question 6
1 / -0

Two bodies A and B of equal mass are kept at height of h and 2 h respectively.What will be the ratio of their potential energies?

A
1: 2

B
2: 1

C
4: 1

D
1: 4
Question 7
1 / -0

The kinetic energy acquired by a mass m in travelling a certain distance d, starting from rest, under action of a constant force is

A
directly proportional to m

B
directly proportional to

C
directly proportional to

D
independent of m
Question 8
1 / -0

A body of mass 20 g moving at 200 m/s passes through a plank and its velocity reduces to 100 m/s. While passing through the plank, what part of its K.E. is lost?

A

B

C

D
Question 9
1 / -0

If a light and a heavy body have equal kinetic energy, which of them has a greater momentum?

A
Light body

B
Heavy body

C
Both have equal momentum

D
Nothing can be said
Question 10
1 / -0

If the K.E. of a particle increases by 4 times, then its momentum will

A
be quadrupled

B
be doubled

C
remain unchanged

D
increase by 16 times
Question 11
1 / -0

Kinetic energy and momentum of a body are 3000 J and 60 kg ms^{- 1} respectively. What is the mass of the body?

A
1.7 kg

B
0.6 kg

C
0.01 kg

D
0.2 kg
Question 12
1 / -0

How much work is needed to be done on an object of mass 3 kg to give it a momentum of 900 kg m/s?

A
1.3510⁵ J

B
1.510² J

C
1.510² J

D
1.3510^-5J
Question 13
1 / -0

An object of mass `m` has a kinetic energy `K`. What will be its new kinetic energy if its momentum is halved?

A

B

C

D
Question 14
1 / -0

A ball of mass 0.1 kg is thrown vertically upwards with an initial speed of 20 ms^-1. The maximum height reached by the ball is

A
10 m

B
20 m

C
15 m

D
30 m
Question 15
1 / -0

A simple pendulum while oscillating rises to a maximum vertical height of 20 cm from its rest position. What is the velocity of bob at its resting position if its mass is 600g?
(Take g = 10 m/s²)

A
1 ms^-1

B
2 ms^-1

C
3 ms^-1

D
4 ms^-1
Question 16
1 / -0

Which of the following is correct?

A
1 W = 0.0013 hp

B
1 hp = 0.0013 W

C
1 W = 746 hp

D
None of these
Question 17
1 / -0

What is the commercial unit of electrical energy?

A
Joule

B
kWh

C
Wh

D
None of these
Question 18
1 / -0

An engine generates 20 KW of power. How much time will it take to lift a mass of 500 kg to a height of 40 m?
(Take g = 10 m/s²)

A
10s

B
25s

C
8s

D
20s
Question 19
1 / -0

The power delivered to the turbine by a water fall pouring down at the rate of 100 kg per second on the blades of turbine is 100 KW. What is the height of the fall?

A
10 m

B
100 m

C
50 m

D
120 m
Question 20
1 / -0

An electric motor exerts a force of 24 N on a cable and pulls it by a distance of 15 m in one minute. What is the power supplied by the motor?

A
3.6 W

B
24 W

C
6 W

D
1.6 W