Work and Energy Test

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Work and Energy Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

What is the angle between displacement and the force applied, when the work done is maximum?

A
0^o

B
45^o

C
60^o

D
90^o

Question 2

1 / -0

In the table given below energy transformations and different processes are listed. Match them.

I. A water fall	(i) Electric to mechanical
II. Microphone	(ii) Sound to electrical
III. Loud speaker	(iii) Potential to kinetic
IV. Electric fan	(iv) Electric to sound

(iii), (ii), (iv), (i)

(iii), (iv), (ii), (i)

(i), (iv), (ii), (iii)

(i), (ii), (iv), (iii)

Question 3
1 / -0

The unit kgm²s^-2 is associated with

A
work

B
kinetic energy

C
potential energy

D
all of these
Question 4
1 / -0

A crane pulls up a car of mass 650 kg to a vertical height of 4 m. What is the work done by the crane?

A
25.48 KJ

B
2.6 KJ

C
162.5 J

D
6.5 KJ
Question 5
1 / -0

A force of 250 N on a block does a work of 2250 J. By how much length will the block be displaced?

A
5 m

B
9 m

C
2.5 m

D
22.5 m
Question 6
1 / -0

Two bodies of equal mass move with uniform velocities of V and 2V respectively. Find the ratio of their kinetic energies.

A
1 : 1

B
2 : 1

C
1 : 4

D
4 : 1
Question 7
1 / -0

A ball of mass 200 g falls from a height of 5 m. What is its kinetic energy when it just reaches the ground? (g = 9.8 m/sec²)

A
9.8 J

B
980 J

C
4.9 J

D
None of these
Question 8
1 / -0

What is the work done by gravitational force when a body of mass 10 kg is dropped to the ground from a height of 10 meters?

(Take g = 9.8 ms^-2)

A
- 980 J

B
- 490 J

C
+ 980 J

D
+ 490 J
Question 9
1 / -0

The K.E. of a running man is half to that of a boy half his mass. The man speeds up by 1 m/s and then has the same K.E. as the boy. What were the original speeds of the man and the boy?

A
1.2 m/s, 2.4 m/s

B
2.4 m/s, 2.4 m/s

C
2.4 m/s, 4.8 m/s

D
4.8 m/s, 9.6 m/s
Question 10
1 / -0

A force `F` stops a body of mass `m` moving with a velocity `v` in a distance `s`, What is the force required to stop a body of double the mass moving with double the velocity in the same distance?

A
F

B
4F

C
8F

D
2F

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Re-Attempt Weekly Quiz Competition

Work and Energy Test - 1

Result

Work and Energy Test - 1

Score

-

Rank

-

SHARING IS CARING

Question 1

0o

45o

60o

90o

Question 2

(iii), (ii), (iv), (i)

(iii), (iv), (ii), (i)

(i), (iv), (ii), (iii)

(i), (ii), (iv), (iii)

Question 3

work

kinetic energy

potential energy

all of these

Question 4

25.48 KJ

2.6 KJ

162.5 J

6.5 KJ

Question 5

5 m

9 m

2.5 m

22.5 m

Question 6

1 : 1

2 : 1

1 : 4

4 : 1

Question 7

9.8 J

980 J

4.9 J

None of these

Question 8

- 980 J

- 490 J

+ 980 J

+ 490 J

Question 9

1.2 m/s, 2.4 m/s

2.4 m/s, 2.4 m/s

2.4 m/s, 4.8 m/s

4.8 m/s, 9.6 m/s

Question 10

F

4F

8F

2F

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Question Analysis

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0^o

45^o

60^o

90^o