Science General · Physics

Energy and Electrical Devices

1,182 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 types of cells electricity physics

Which one works with the help of dry cell?

  1. Torches

  2. Transistors, toys

  3. T.V.remotes

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dry cells (Leclanche cells) are portable power sources commonly used in low-drain devices like torches, toys, and remote controls.

Multiple choice types of cells electricity physics

Out of the following the one which is a source of e.m.f is:

  1. voltaic cell

  2. dynamo

  3. thermocouple

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

A voltaic cell is an electrochemical cell that produces electrical energy. In voltaic cell there is an anode where oxidation occurs and a cathode where reduction occurs. So, it produces current and thus emf is produced in voltaic cells.

Multiple choice types of cells electricity physics

A battery converts chemical energy into

  1. mechanical energy

  2. solar energy

  3. electrical energy

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A battery converts chemical energy into electrical energy.


Answer-(C)

Multiple choice

Lightsabers are powered by . . .

  1. The nearest star

  2. Batteries

  3. The Force

  4. Kyber Crystals
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lightsabers are powered by Kyber crystals, which are attuned to the Force and focus the energy of the blade.

Multiple choice physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

Two general types of vacuum assisted power brakes are

  1. Vacuum suspended and power suspended

  2. Integral and pressure suspended

  3. Atmospheric and vacuum suspended

  4. Power and pressure suspended
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Atmospheric power brakes and vaccum suspended power brake are two classifications of vaccum assisted power brakes.

Multiple choice physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

Sequence of energy conversion in a thermal power plant is:
P) Heat energy Q) Electrical energy R) Mechanical energy

  1. $P\rightarrow Q\rightarrow R$
  2. $P\rightarrow R\rightarrow Q$
  3. $R\rightarrow Q\rightarrow P$
  4. $Q\rightarrow R\rightarrow P$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sequence of energy conversion is Heat energy $\rightarrow$ Mechanical energy $\rightarrow$ Electrical energy.

Multiple choice zoology not for breathing not for drinking air pollution and its control air pollution - effects and control environmental issues

Which of the following applications use catalytic converters?

  1. Automobiles

  2. Wind mills

  3. Poultry farms

  4. Dairy farms
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The method abatement of the pollution is generally adopted to reduce the sources of pollution and the impact and its consequences on the environment and health. There are techniques like the scrubbers, filters, etc., which reduce the emission of the harmful and toxic gases. The catalytic converters in automobiles are used to minimize the release of oxides of nitrogen and sulphur and unburnt hydrocarbons. This helps to reduce the air pollution. 

Thus, the correct answer is option A.