Work, Energy and Power Test

Result

Work, Energy and Power Test - 67

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Weekly Quiz Competition

Question 1
4 / -1

An engine pumps up 100 kg of water through a height of 10 m in 5s. given that the efficiency of the engine is 60%. If g = m/sec², the power of the engine is

A
3.3 kW

B
0.33 kW

C
0.033 kW

D
33 kW

Solution
Question 2
4 / -1

The power of pump, which can pump 200 kg water to a height of 50 m in 10 sec, will be

A
10 × 10³ watt

B
20 × 10³ watt

C
4 × 10³ watt

D
60 × 10³ watt

Solution
Question 3
4 / -1

An engine pump is used to pump a liquid of density ρ continuously through a pipe of cross-sectional area A. If the speed of flow of the liquid in the pipe is v, then the rate at which kinetic energy is being imparted to the liquid is

A

B

C

D

Solution
Question 4
4 / -1

An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 m/s. The mass per unit length of water in the pipe is 100 kg/m. What is the power of the engine

A
800 W

B
400 W

C
200 W

D
100 W

Solution
Question 5
4 / -1

A particle of mass M starting from rest undergoes uniform acceleration. If the speed acquired in time T is V, the power delivered to the particle is

A

B

C

D
Question 6
4 / -1

A body projected vertically from the earth reaches a height equal to earth\'s radius before returning to the earth. The power exerted by the gravitational force is greatest

A
At the instant just after the body is projected

B
At the highest position of the body

C
At the instant just before the body hits the earth

D
It remains constant all through

Solution
Question 7
4 / -1

A mass m slips along the wall of a semispherical surface of radius R. The velocity at the bottom of the surface is

A

B

C

D

Solution
Question 8
4 / -1

A ball is projected vertically upwards with a certain initial speed. Another ball of the same mass is projected at an angle of 60° with the vertical with the same initial speed. At highest points of their journey, the ratio of their potential energies will be

A
1 : 1

B
2 : 1

C
3 : 2

D
4 : 1

Solution
Question 9
4 / -1

The kinetic energy possessed by a body of mass m moving with a velocity v is equal to 1/2 mv², provided

A
The body moves with velocities comparable to that of light

B
The body moves with velocities negligible compared to the speed of light

C
The body moves with velocities greater than that of light

D
None of the above statement is corrects
Question 10
4 / -1

A bullet of mass 0.02 kg travelling horizontally with velocity 250 ms^–1 strikes a block of wood of mass 0.23 kg which rests on a rough horizontal surface. After the impact, the block and bullet move together and come to rest after travelling a distance of 40 m. The coefficient of sliding friction of the rough surface is (g = 9.8 ms^–2)

A
0.75

B
0.61

C
0.51

D
0.30

Solution