Work, Energy and Power Test

Result

Work, Energy and Power Test - 34

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Weekly Quiz Competition

Question 1
4 / -1

A block of mass 5 kg is resting on a smooth surface. At what angle a force of 20N be acted on the body so that it will acquired a kinetic energy of 40J after moving 4m

A
30^o

B
45^o

C
60^o

D
120^o

Solution
Question 2
4 / -1

Natural length of a spring is 60 cm, and its spring constant is 2000 N/m. A mass of 20kg is hung from it. The extension produced in the spring is..... (g = 9.8 m/s²)

A
4.9 cm

B
0.49 cm

C
9.8 cm

D
0.98 cm

Solution
Question 3
4 / -1

If W_a, W_b, and W_c represent the work done in moving a particle from X to Y along three different path a, b, and c respectively (as shown) in the gravitational field of a point mass m, find the correct relation between W_a, W_b and W_c.

A
W_b > W_a > W_c

B
W_a< W_b < W_c

C
W_a > W_b > W_c

D
W_a = W_b = W_c
Question 4
4 / -1

A toy car of mass 4 kg moves up a ramp under the influence of force F plotted against displacement x. The maximum height attained is given by (Take g = 10 m/s²)

A
ymax = 5m

B
ymax = 10m

C
ymax = 15m

D
ymax = 20m
Question 5
4 / -1

A particle of mass 0.5kg travels in a straight line with velocity v = ax^3/2 , Where a = 5^–1/2S^–1. The work done by the net force during its displacement from x = 0 to x = 2m is

A
50 J

B
45 J

C
25 J

D
None of these

Solution
Question 6
4 / -1

Given below is a graph between a variable force (F) (along y-axis) and the displaement (X) (along x-axis) of a particle in one dimension. The work done by the force in the displacement interval between 0m and 30m is

A
275 J

B
325 J

C
400 J

D
300 J
Question 7
4 / -1

Force F on a particle moving in a straight line varies with distance d as shown in the figure. The work done on the particle during its displacement of 12m.

A
27 J

B
24 J

C
36 J

D
26 J
Question 8
4 / -1

A spring with spring constant K when stretched through 2 cm the potential energy is U. If it is stretched by 6 cm. The potential energy will be......

A
6U

B
3U

C
9U

D
18U
Question 9
4 / -1

If linear momentum of body is increased by 1.5%, its kinetic energy increases by.......%

A
0%

B
10%

C
2.25%

D
3%

Solution
Question 10
4 / -1

With what velocity should a student of mass 40 kg run so that his kinetic energy becomes 160 J ?

A
4 m/s

B
√8 m/s

C
16 m/s

D
8 m/s

Solution