Work & Energy MCQs with Answers

A body of mass 1 kg is lifted through a height of 1 m. The energy possessed in the body will be: (consider g = 10 ms^-2).

• A.10 Joule
• B.1 Joule
• C.100 Joule
• D.0.1 Joule

A kilowatt hour is a unit of _?

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

The fuel is another form of energy which the car uses and it is converted into kinetic energy in the engine.

• A.Chemical
• B.Electrical
• C.Nuclear
• D.Thermal

According to Einstein, 1 kg mass is converted to how much energy?

• A.9 × 10⁸ J
• B.9 × 10¹⁶ J
• C.3 × 10⁸ J
• D.3 × 10¹⁶ J

Past Paper MCQ

The Energy due to position is called _?

• A.Kinetic Energy
• B.Potential Energy
• C.Thermal Energy
• D.Chemical Energy

A circular disc of mass M and radius R is rotating about its axis with uniform speed. Its kinetic energy is?

• A.½ × Mv²
• B.¼ × Mv²
• C.Mv²
• D.2 × Mv²

When a spring is stretched by 10 cm, the potential energy stored is E. When the spring is stretched by 10 cm more, the potential energy stored in the spring becomes?

• A.2E
• B.3E
• C.4E
• D.E

The total energy in the universe is ?

• A.Increasing
• B.Decreasing
• C.Constant
• D.None of these

A particle of mass 40 g executes a simple harmonic motion of amplitude 2.0 cm. If the time period is 0.20 s, find the total mechanical energy of the system?

• A.1.6 × 10⁻² J
• B.4.0 × 10⁻³ J
• C.8.0 × 10⁻³ J
• D.2.0 × 10⁻³ J

Which of the following quantities does not remain conserved during pair production?

• A.Charge
• B.Mass
• C.Momentum
• D.Energy