Past Papers of MDCAT ECAT Physics, Work and Energy Test 5

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Question 1: An automobile is moving forwards with uniform velocity due to the force exerted by its engine. If that force is doubled with the velocity remaining constant, what happens to its total power? (MDCAT 2019)

A) It does not change

B) It is halved

C) It is squared

D) It is doubled

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

Question 2: Which of the following statements shows that no work is done? (MDCAT 2019)

A) Pushing a car to start it moving

B) Lifting the weights

C) Writing an essay on a page

D) The moon orbiting the earth

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

Question 3: 1.75 m tall weight-lifter raises weights with a mass of 50 kg to a height of 0.5m above his head. How much work is being done by him? (g=10 m/s²) (NMDCAT 2020)

A) 2125 J

B) 2500 J

C) 50 J

D) 1225 J

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

Question 4: When the speed of your car is halved, by what factor does its kinetic energy decrease? (NMDCAT 2020)

A) 1/2

B) 1/4

C) 1/8

D) 1/6

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

Question 5: Which of the following forces is a non-conservative force? (NMDCAT 2020)

A) Frictional force

B) Gravitational force

C) Electric force

D) Elastic spring force

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

Question 6: The area under a force-displacement graph gives us: (NUMS 2020)

A) Displacement

B) Power

C) Work

D) Acceleration

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

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