Work and Energy MCQs for MDCAT Practice

Physics section, Work and Energy chapter. Sample questions from past PMC papers.

1. Question 1
   A block of mass 10 kg is moving in x-direction with a constant speed of 10 m/s. It is subjected to a retarding force F = -0.1 J/m during its travel from x = 20 m to x = 30 m. Its final kinetic energy will be:
   • A.475 J
   • B.450 J
   • C.275 J
   • D.250 J
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2. Question 2
   A parachutist is falling constant terminal velocity. Which statement is not correct?
   • A.Gravitational potential energy is converted into kinetic energy of the air.
   • B.Gravitational potential energy is converted into kinetic energy of the parachutist.
   • C.Gravitational potential energy is converted into thermal energy of the air
   • D.Gravitational potential energy is converted into thermal energy of the parachutist.
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3. Question 3
   A force F=(5i-3j)N is applied over a particle which displaces it from its origin to the point r=(2i-1j)m. The work done on the particle is:
   • A.-7 joules
   • B.+7 joules
   • C.+ 13 joules
   • D.-11 joules
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4. Question 4
   A motorist travelling at 10 ms-1 can bring his car to rest in a braking distance of 10 m. In what distance could he bring the car to rest from the period of 30 ms-1 using the same breaking force?
   • A.17m
   • B.30 m
   • C.52 m
   • D.90 m
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5. Question 5
   If 10 kg mass is dropped from a certain height, hits the ground with speed 10 ms-1. The height will be
   • A.100 m
   • B.10 m
   • C.50 m
   • D.5 m
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6. Question 6
   The radius of the planet is five times the radius of earth but of same mass, value of g on the planet is
   • A.5 g
   • B.1/5 g
   • C.1/20 g
   • D.1/25 g
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7. Question 7
   A neutron travel the distance of 12 m in a time interval of 3.6 x 10^(4) s. Assuming its speed was constant its kinetic energy is: (take 1.7 x 10^(-27) kg as the mass of neutron)
   • A.3.1 eV
   • B.4.7 eV
   • C.6.91 eV
   • D.5.78 eV
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8. Question 8
   Two bodies with kinetic energies having a ratio of 4:1, are moving with equal linear momentum. The ratio of their masses is:
   • A.1:2
   • B.1:4
   • C.4:1
   • D.1:1
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