Science General ยท Physics

Energy and Electrical Devices

1,193 Questions

Energy and electrical devices focus on energy conversion, household electrical appliances, batteries, and electric vehicle technology. These principles are essential components of general science syllabi across major competitive examinations. Review these practice questions to strengthen understanding of electrical energy applications and devices.

Energy conversionHousehold electrical appliancesBatteries and cellsElectric vehicles

Energy and Electrical Devices Questions

Multiple choice

An electric motor is used to convert

  1. electrical energy into mechanical energy

  2. mechanical energy into kinetic energy

  3. mechanical energy into electrical energy

  4. high voltage to low voltage
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice

The brake power is the power available

  1. in the engine cylinder

  2. at the crank shaft

  3. at the crank pin

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The break power is the power available at the crank shaft.

Multiple choice

Which object converts sound energy into electric energy?

  1. Microphone

  2. An electric bell

  3. Radio

  4. Loud speaker
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A microphone is a transducer that converts sound waves (mechanical energy) into electrical signals. Loudspeakers perform the reverse, converting electrical energy into sound.

Multiple choice

Which of these is not a rechargeable battery?

  1. Nickel-cadmium

  2. Alkaline

  3. Lithium ion

  4. Nickel metal hydride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Alkaline batteries are primary cells, meaning they are designed to be used once and then discarded. Nickel-cadmium, Lithium-ion, and Nickel metal hydride are all secondary (rechargeable) battery chemistries.