Work & Energy MCQs with Answers

If a body of mass m moving with velocity v has kinetic energy K.E., then if its K.E. is doubled, its momentum becomes:

• A.1/√2 times
• B.2 times
• C.4 times
• D.√2 times

According to the law of conservation of energy, what can happen to energy?

• A.Energy can be created from nothing
• B.Energy can be destroyed completely
• C.Energy can be converted from one form into another
• D.Energy can be created and destroyed simultaneously

Calculate the work done when 1 mole of an ideal gas expands from 15 dm³ to 20 dm³ against a constant external pressure of 2 atmospheres.

• A.-10 atm.dm³
• B.+10 atm.dm³
• C.-5 atm.dm³
• D.+5 atm.dm³

What does the law of conservation of energy state about the creation and destruction of energy?

• A.Energy can be created but not destroyed
• B.Energy can be destroyed but not created
• C.Energy is always conserved
• D.Energy can be both created and destroyed

What is the formula for Potential Energy?

• A.PE = mgh
• B.PE = ½mv²
• C.PE = mv
• D.PE = ma

The photoelectric effect occurs at energies?

• A.Less than 0.5 MeV
• B.Between 0.5 MeV and 1.02 MeV
• C.Greater than 1.02 MeV
• D.Exactly 1.02 MeV

Which of the following is used as a fuel to produce heat energy?

• A.Wind Energy
• B.Nuclear Energy
• C.Biomass Energy
• D.Hydro Energy

What is the correct order of increasing energy among alpha, beta, and gamma radiations?

• A.Alpha, Gamma, Beta
• B.Gamma, Beta, Alpha
• C.Beta, Alpha, Gamma
• D.Alpha, Beta, Gamma

The ground state energy of an electron in a one-dimensional trap with zero potential energy in the interior and infinite potential energy at the walls

• A.Is independent of temperature
• B.Increases with increasing temperature
• C.Decreases with increasing temperature
• D.Is directly proportional to temperature

A constant force F acts on a body and moves it a distance Δd in a time Δt. The rate at which the force is doing work is _?

• A.F × Δd/Δt
• B.F × Δt/Δd
• C.F × Δd × Δt
• D.F/(Δd × Δt)