Work, Energy and Power Test

Result

Work, Energy and Power Test - 66

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

A
– 7 J

B
Zero

C
+ 7 J

D
+ 19 J

Solution
Question 2
4 / -1

A
B/2A

B
2A/B

C
A/B

D
B/A

Solution
Question 3
4 / -1

A body of mass m accelerates uniformly from rest v₁ in time t₁. As a function of time t, the instantaneous power delivered to the body is

A

B

C

D

Solution
Question 4
4 / -1

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine (g = 10 m/s²)

A
12.3 kW

B
7.0 kW

C
8.1 kW

D
10.2 kW

Solution
Question 5
4 / -1

An electric immersion heater of 1.08 kW is immersed in water. After the water has reached a temperature of 100°C, how much time will be required to produce 100g of steam

A
210 s

B
105 s

C
420 s

D
50 s

Solution
Question 6
4 / -1

Power of a water pump is 2 kW. If g = 10 m/sec², the amount of water it can raise in one minute to a height of 10 m is

A
2000 litre

B
1000 litre

C
100 litre

D
1200 litre

Solution
Question 7
4 / -1

An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height of 40 m. (g = 10 m/sec²)

A
4 sec

B
5 sec

C
8 sec

D
10 sec

Solution
Question 8
4 / -1

An apple give 21 kJ energy to a boy. How much height he can climb by using the energy if his efficiency is 28% (mass of by = 40 kg)

A
22.5 m

B
15 m

C
10 m

D
5 m

Solution
Question 9
4 / -1

The power of a pump, which can pump 200 kg of water to a height of 200 m in 10 sec is (g = 10 m/sec²)

A
40 kW

B
80 kW

C
400 kW

D
960 kW

Solution
Question 10
4 / -1

A pump motor is used to deliver water at a certain rate from a given pipe. To obtain twice as much water from the same pipe in the same time, power of the motor has to be increased to

A
16 times

B
4 times

C
8 times

D
2 times

Solution