Work & Energy MCQs with Answers

When a body moves against the force of friction on a horizontal plane, the work done by the body is?

• A.Zero
• B.Positive
• C.Negative
• D.Infinite

Kilowatt is the unit of _?

• A.Energy
• B.Power
• C.Force
• D.Current

Which one of the following has the same unit?

• A.Torque and Energy
• B.Force and Pressure
• C.Power and Work
• D.Velocity and Acceleration

A line drive to the shortstop is caught at the same height as it was originally hit. Over its entire flight, the work done by gravity and the work done by air resistance, respectively, are:

• A.Zero; zero
• B.Zero; negative
• C.Positive; negative
• D.Negative; positive

Which of the following is equivalent to using ten 100 watt light bulbs for 1 hour?

• A.0.1 kilowatt hour (kWh)
• B.10 kilowatt hours (kWh)
• C.100 watt hours
• D.1 kilowatt hour (kWh)

The total energy of oscillation depends on ?

• A.Half of the amplitude
• B.Square root of the amplitude
• C.Cube of the amplitude
• D.Square of the amplitude

The work done is zero when?

• A.Force is parallel to displacement
• B.Force is perpendicular to displacement
• C.Force is opposite to displacement
• D.Force is at 45° to displacement

One kilowatt-hour of work is equal to?

• A.3.6 kJ
• B.3.6 MJ
• C.36 MJ
• D.360 kJ

1 KWh = _ J?

• A.3.6 × 10⁶ J
• B.3.6 × 10³ J
• C.3.6 × 10⁵ J
• D.3.6 × 10⁸ J

The dimension of work is like the dimension of _?

• A.Torque
• B.Power
• C.Force
• D.Pressure