Work, Energy and Power Test

Result

Work, Energy and Power Test - 46

Score
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Weekly Quiz Competition

Question 1
4 / -1

What is the velocity of the bob of a simple pendulum at its mean position, if it is able to rise to vertical height of 10 cm? (Take g = 9.8 m/s²)

A
0.6 m/s

B
1.4 m/s

C
1.8 m/s

D
2.2 m/s

Solution
Question 2
4 / -1

A particle of mass ‘m’ and charge ‘q’ is accelerated through a potential difference of ‘V volt, its energy is

A

B

C

D
Question 3
4 / -1

If a body looses half of its velocity on penetrating 3 cm in a wooden block, then how much will it penetrate more before coming to rest?

A
1 cm

B
2 cm

C
3 cm

D
4 cm

Solution
Question 4
4 / -1

Two bodies moving towards each other collide and move away in opposite directions. There is some rise in temperature of bodies because a part of the kinetic energy is converted into

A
Heat energy

B
Electrical energy

C
Nuclear energy

D
Mechanical energy
Question 5
4 / -1

A particle of mass m at rest is acted upon by a force F for a time t. Its kinetic energy after an interval t is

A

B

C

D

Solution
Question 6
4 / -1

The potential energy of a weight less spring compressed by a distance a is proportional to

A
a

B
a²

C
a^–2

D
a^o

Solution
Question 7
4 / -1

A simple pendulum is released from A as shown. If m and l represent the mass of the bob and length of the pendulum, the gain in kinetic energy at B is

A

B

C

D

Solution
Question 8
4 / -1

A 2 kg block slides on a horizontal floor with a speed of 4 m/s. It strikes an uncompressed spring and compresses it till the block is motionless. The kinetic friction force is 1.5 N and spring constant is 10,000 N/m. The spring compresses by

A
5.5 cm

B
2.5 cm

C
11.0 cm

D
8.5 cm

Solution
Question 9
4 / -1

A bullet moving with a speed of 100 ms^–1 can just penetrate two planks of equal thickness. Then, the number of such planks penetrated by the same bullet when the speed is doubled will be

A
4

B
8

C
6

D
10

Solution
Question 10
4 / -1

If momentum is increased by 20%, then kinetic energy increases by

A
48%

B
44%

C
40%

D
36%

Solution