Past Papers of MDCAT ECAT Physics, Work and Energy Test 4

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Question 1: Two boys weighing in the ratio 4:5 goes up stair taking time in ratio 5:4. The ratio of their power is:

A) 1

B) 16/25

C) 25/16

D) 4/5

Explanation: Scroll down after completing the quiz to view the detailed explanation for this question.

Question 2: A stone of mass 2.0 kg is dropped from a rest position 5.0m above the ground. What is its velocity at a height of 3.0m above the ground? (MDCAT 2018)

A) 12.5 m/s

B) 9.3 m/s

C) 6.3 m/s

D) 16.0 m/s

Explanation: Scroll down after completing the quiz to view the detailed explanation for this question.

Question 3: The rate at which work is being done is called: (MDCAT 2018)

A) Power

B) Density

C) Energy

D) Force

Explanation: Scroll down after completing the quiz to view the detailed explanation for this question.

Question 4: A man has a mass of 80 kg. He ties himself to one end of a rope which passes over a single fixed pulley. He pulls on the other end of the rope to lift himself up at an average speed of 50 cm/s. What is the average useful power at which he is working? (ETEA 2018)

A) 40 W

B) 0.39 kW

C) 4.0 kW

D) 39 kW

Explanation: Scroll down after completing the quiz to view the detailed explanation for this question.

Question 5: If the momentum of a body decreases by 20%, the percentage decrease in K.E will be: (ETEA 2018)

A) 44%

B) 36%

C) 28%

D) 20%

Explanation: Scroll down after completing the quiz to view the detailed explanation for this question.

Question 6: A man carries a 1 kg body 10m horizontally on a level ground. The work done by the man is: (ETEA 2018)

A) 10 J

B) 1 J

C) 0 J

D) 5 J

Explanation: Scroll down after completing the quiz to view the detailed explanation for this question.

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