Work & Energy MCQs with Answers

Bio fuel are the source of energy derived from ?

• A.Plants and animals
• B.Fossil fuels only
• C.Nuclear reactions
• D.Geothermal sources

What is one way to gain heat from biomass?

• A.By dissolving it in water
• B.By freezing it
• C.By burning it
• D.By exposing it to moonlight

The value of Planck constant is _?

• A.6.63 × 10^-36 Js
• B.6.63 × 10^-32 Js
• C.6.63 × 10^-30 Js
• D.6.63 × 10^-34 Js

Which of the following is a use of biomass?

• A.Used as fuel
• B.Used as fertilizer only
• C.Used as construction material
• D.Used as a cooling agent

A process in which two light nuclei combine to form a heavier nucleus is called?

• A.Nuclear fission
• B.Radioactive decay
• C.Nuclear fusion
• D.Chain reaction

Hydrogen bomb is an example (depends upon) of the process of _?

• A.Nuclear Fission
• B.Radioactive Decay
• C.Chemical Combustion
• D.Nuclear Fusion

What happens to atoms during nuclear fission?

• A.Atoms are split apart
• B.Atoms are combined together
• C.Atoms are vaporized
• D.Atoms are ionized

A body of mass 2 kg absorbed 10 J of radioactive radiations, then the absorbed dose of radiation in rad is _?

• A.5 rad
• B.50 rad
• C.500 rad
• D.5000 rad

What is the work function of the metal if the light of wavelength 4000 Å generates photoelectrons of velocity 6 × 10^5 ms⁻¹ from it?

• A.1.1 eV
• B.3.1 eV
• C.2.1 eV
• D.4.1 eV

The density of states for a metal depends primarily on ?

• A.The volume
• B.The temperature
• C.The pressure
• D.The energy