Work, Energy and Power Test

Result

Work, Energy and Power Test - 65

Score
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Rank
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Weekly Quiz Competition

Question 1
4 / -1

A spring 40 mm long is stretched by the application of a force. If 10 N force required to stretch the spring through 1 mm, then work done in stretching the spring through 40 mm is

A
84 J

B
68 J

C
23 J

D
8 J

Solution
Question 2
4 / -1

A body of mass 3 kg is under a force, which causes a displacement in it given by S = t³/3 (in m). Find the work done by the force in first 2 seconds

A
2 J

B
3.8 J

C
5.2 J

D
24 J

Solution
Question 3
4 / -1

The force constant of a wire is k and that of another wire is 2k. When both the wires are stretched through same distance, then the work done

A

B
W₂ = 2W₁

C
W₂ = W₁

D
W₂ = 0.5 W₁

Solution
Question 4
4 / -1

A body of mass 0.1 kg moving with a velocity of 10 m/s hits a spring (fixed at the other end) of force constant 1000 N/m and comes to rest after compressing the spring. The compression of the spring is

A
0.01 m

B
0.1 m

C
0.2 m

D
0.5 m

Solution
Question 5
4 / -1

A mass of 0.5 kg moving with a speed of 1.5 m/s on a horizontal smooth surface, collides with a nearly weightless spring of force constant k = 50 N/m. The maximum compression of the spring would be

A
0.15 m

B
0.12 m

C
1.5 m

D
0.5 m

Solution
Question 6
4 / -1

A spring with spring constant k when stretched through 1cm, the potential energy is U. If it is stretched by 4 cm. The potential energy will be

A
4U

B
8U

C
16U

D
2U

Solution
Question 7
4 / -1

A spring with spring constant k is extended from x = a to x = x₁. The work done will be

A

B

C

D
Question 8
4 / -1

If a long spring is stretched by 0.02 m, its potential is U. If the spring is stretched by 0.1 m, then its potential energy will be

A
U/5

B
U

C
5U

D
25U

Solution
Question 9
4 / -1

The spring extends by x on loading, then energy stored by the spring is (if T is the tension in spring and k is spring constant)

A

B

C

D

Solution
Question 10
4 / -1

A
360 J

B
240 J

C
– 240 J

D
– 360 J

Solution