Past Papers of MDCAT ECAT Physics, Work and Energy Test 3

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Question 1: If mass ‘m’ is dropped from height ‘h’ vertically, ‘f’ is the force of friction during downward motion, and ‘v’ is the velocity at the bottom, which equation holds? (MDCAT 2017)

A) (1/2)mv² = mgh + fh

B) fh = mgh + (1/2)mv²

C) mgh = (1/2)mv² - fh

D) mgh = (1/2)mv² + fh

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

Question 2: At what angle is work done maximum? (MDCAT 2017)

A) 0° J

B) 45°

C) 90° J

D) 30°

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

Question 3: Which one of the following represents greater work? (MDCAT 2017)

A) +100 J

B) -1000 J

C) -100 J

D) +200 J

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

Question 4: A man of mass 60 kg climbs up a 20m long staircase to the top of a building 10m high. What is the work done by him? Take g = 10 m/s² (ETEA 2017)

A) 12 kJ

B) 6 kJ

C) 3 kJ

D) None of the above

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

Question 5: When a force retards the motion of a body, the work done is: (ETEA 2017)

A) Zero

B) Negative

C) Positive

D) Positive or negative depending on the magnitude of force and displacement

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

Question 6: An engine pumps out 40 kg of water in one second. The water comes out vertically upwards with a velocity of 3 m/s. The power of the engine in kilowatts is: (ETEA 2017)

A) 1.2 kW

B) 12 kW

C) 120 kW

D) 1200 kW

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

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