Explore topic-wise MCQs in Physics Questions and Answers.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

A 200 kg wagon climbs up a hill of slope 30-degrees in 1 minute at a speed of 36 km/h. How much power is delivered by the engine if the frictional force is 25% of the weight of the car? (Assume g = 10m/s2)

A. 25 kW
B. 50 kW
C. 100 kW
D. d)125 kW
Answer» B. 50 kW
Discussion
2.

A 200 kg wagon climbs up a hill of slope 30-degrees in 1 minute at a speed of 10 m/s. How much power is delivered by the engine? (Assume g = 10m/s2)

A. 10 kW
B. 20 kW
C. 30 kW
D. 40 kW
Answer» C. 30 kW
Discussion
3.

1000 kW of power is supplied to a motor. 90% of this is transmitted to a machine operating at 80% efficiency. The machine lifts an object of 10-tons with a velocity _____ m/s. (Assume g = 10m/s2)

A. 2
B. 4
C. 6
D. 8
Answer» D. 8
Discussion
4.

A 2-ton vehicle travels at 20m/s on a road where the frictional force is 10% of the weight of the vehicle. What is the power required? (Assume g = 10m/s2)

A. 220 kW
B. 240 kW
C. 420 kW
D. 440 kW
Answer» E.
Discussion
5.

A machine has a power of 20kW. How long will it take for it to lift a body of mass 10kg from the ground to a height of 100m? (Assume g = 10m/s2)

A. 1 second
B. 2 seconds
C. 3 seconds
D. 4 seconds
Answer» C. 3 seconds
Discussion
6.

A motor is used to pump water from a depth of 5 m to fill a volume of 10 cubic meters in 5 minutes. If 50% of the power is wasted, what is the power of the motor? (Assume g = 10m/s2)

A. 1000/3 W
B. 3000/3 W
C. 5000/3 W
D. 10000/3 W
Answer» E.
Discussion
7.

A motor is used to deliver water through a pipe. Let the motor have a power P initially. To double the rate of flow of water through the pipe, the power is increased to P’. What is the value of P’/P?

A. 2
B. 4
C. 6
D. 8
Answer» E.
Discussion