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 physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

Microphone is used to convert

  1. Electrical energy into sound energy

  2. Sound energy into electrical energy

  3. Sound energy into mechanical energy

  4. Sound energy into chemical energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When we speak on a microphone , our voice (sound energy) is converted in electrical signals (electrical energy) ,which can be transmitted through a wire to a distance . 

Multiple choice physics scientists inventions and inventors in science indian scientist: biography and achievements scientist and their achievements

In a microwave oven the device used for generating microwaves is

  1. Stirrer fan

  2. Metal wall

  3. Magnetron

  4. Cyclotron
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A magnetron is a high-powered vacuum tube that generates microwaves by interacting a stream of electrons with a magnetic field, which is the core component of a microwave oven.

Multiple choice physics energy and its forms idea of energy introduction to work and energy work and energy

The form of energy present in a wound spring is :

  1. Chemical

  2. Heat energy

  3. Magnetic

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

no chemical reaction takes place while wounding a spring so no chemical energy.

no energy is stored in the form of temperature change so no heat energy is stored.
no magnetic field is around the spring so no magnetic energy.
but due to change in shape of the metal potential energy is stored, so answer is option D.

Multiple choice physics energy and its forms idea of energy introduction to work and energy work and energy

What type of energy conversion takes place when a compressed spring is released?

  1. Molecular energy to potential energy

  2. Kinetic energy to potential energy

  3. Potential energy to kinetic energy

  4. Potential energy to molecular energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A compressed spring stores elastic potential energy. When released, this potential energy is converted into kinetic energy as the spring moves.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

What kind of changes is undergone when an electric bulb glows?

  1. A physical change

  2. A chemical change

  3. Both a physical and a chemical change

  4. A permanent change
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When an electric bulb glows a physical change is observed. As the light produced by the electric bulb is due to the heating effect of the conductor. Even though there is an occurrence of temperature change since no new substances are produced it is considered to be a physical change.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

The energy stored in a torch cell is :

  1. Light energy

  2. Electrical energy

  3. Chemical energy

  4. Potential energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The torch cell makes use of redox reaction to store energy in the form of chemical energy. This chemical energy is then converted to electrical energy and finally to light energy as the bulb glows.


Hence, correct answer is option $C$

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

An electric heater converts electrical energy into

  1. Chemical energy

  2. Heat energy

  3. Light energy

  4. Muscular energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An electric heater is an electrical device that converts electrical energy into heat energy. The heating elements inside electric heater is an electrical converter and works on the principle of joule heating. An electric current passing through resistor converts electrical energy into heat energy.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

The form of energy that wood can be categorized into is:

  1. chemical energy

  2. electrical energy

  3. potential energy

  4. muscular energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

You'd burn it, just like you might burn coal or oil or natural gas. The stored energy in the wood is chemical energy, meaning that it can be released by a chemical reaction (burning). It's closely related to those fossil fuel energies, because the chemical energy was formed by photosynthesis, using energy from sunlight as the input.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

From the following statements find the one that is NOT correct:

  1. A flying bird has both potential and kinetic energy.

  2. A ball rolling on the ground has kinetic energy but no mechanical energy.

  3. A stretched rubber band has potential energy

  4. Chemical energy can be converted into electrical energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A body having either. Kinetic' energy or Potential energy or both is said to be having Mechanical energy.

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

Select the best definition of mechanical energy?

  1. Energy possessed by an object due to its location or motion

  2. Energy possessed by an object due to its temperature

  3. Energy possessed by an object due to its magnetic property

  4. Energy of an object due to its concentration

  5. Energy possessed by an object due to its age
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. Mechanical energy can be either kinetic energy(energy of motion) or potential energy (stored energy of position). 

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

In a hydroelectric power plant ___ energy is converted into ____ energy.

  1. Chemical into electrical

  2. Chemical into mechanical

  3. Mechanical into electrical

  4. Electrical into mechanical
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In hydroelectric power plant following sequence of energy transformation take place, 

Kinetic energy of water to potential energy of water to mechanical energy of turbine to electric energy through generator.
So among the options given best possible answer is option C.