Work, Energy and Power Test

Result

Work, Energy and Power Test - 23

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Weekly Quiz Competition

Question 1
4 / -1

The mass of a car is 1000 kg. How much work is required to be done on it to make it move with a speed of 36 km/h ?

A
2.5 × 10⁴ J

B
5 × 10³ J

C
500 J

D
5 × 10⁴ J
Question 2
4 / -1

A spring gun of spring constant 90 × 10²N/M is compressed by a ball of mass 16g. If the trigger is pulled, calculate the velocity of ball

A
60 m/s

B
3 m/s

C
90 m/s

D
30 m/s
Question 3
4 / -1

The potential energy of a body is given by U = A – Bx² (where x is displacement). The magnitude of force acting on the particle is

A
constant

B
proportional to x

C
proportional to x²

D
Inversely proportional to x

Solution
Question 4
4 / -1

A particle is moving under the influence of a force given by F = kx, where k is a constant and x is the distance moved. What energy (in joule) gained by the particle in moving from x = 1m to x = 3m ?

A
2 k

B
3 k

C
4 k

D
9 k

Solution
Question 5
4 / -1

The decreases in the potential energy of a ball of mass 25 kg which falls from a height of 40 cm is

A
968 J

B
100 J

C
1980 J

D
200 J
Question 6
4 / -1

A rope-way trolly of mass 1200kg uniformly from rest to a velocity of 72 km/h in 6s. What is the average power of the engine during this period in watt ?(Neglect friction)

A
400 W

B
40,000 W

C
24000 W

D
4000 W

Solution
Question 7
4 / -1

If the force F is applied on a body and it moves with a velocity v, the power will be

A
Fv

B
F/v

C
F/v²

D
Fv²
Question 8
4 / -1

The coefficient of restitution e for a perfectly elastic collision is

A
1

B
0

C
∞

D
–1
Question 9
4 / -1

Two balls at same temperature collide. What is conserved

A
Temperature

B
velocity

C
kinetic energy

D
momentum
Question 10
4 / -1

A ball is allowed to fall from a height 20m . If there is 30% loss of energy due to impact, then after one impact ball will go up to

A
18 m

B
16 m

C
12 m

D
14 m

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Re-Attempt Weekly Quiz Competition

Work, Energy and Power Test - 23

Result

Work, Energy and Power Test - 23

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SHARING IS CARING

Question 1

2.5 × 104 J

5 × 103 J

500 J

5 × 104 J

Question 2

60 m/s

3 m/s

90 m/s

30 m/s

Question 3

constant

proportional to x

proportional to x2

Inversely proportional to x

Solution

Question 4

2 k

3 k

4 k

9 k

Solution

Question 5

968 J

100 J

1980 J

200 J

Question 6

400 W

40,000 W

24000 W

4000 W

Solution

Question 7

Fv

F/v

F/v2

Fv2

Question 8

1

0

∞

–1

Question 9

Temperature

velocity

kinetic energy

momentum

Question 10

18 m

16 m

12 m

14 m

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2.5 × 10⁴ J

5 × 10³ J

5 × 10⁴ J

proportional to x²

F/v²

Fv²