Science General · 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 chemistry non-metals dihydrogen fuel dihydrogen as a fuel introduction to hydrogen

The usage of dihydrogen is:

  1. It acts a a fuel cell

  2. Energy is distributed in the form of dihydrogen

  3. It is economical fuel

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

Dihydrogen fuel is a zero-emission fuel when burned with oxygen (if one considers water not as an emission) or used in a contained cell. The energy released enables hydrogen to act as a fuel. In an electrochemical cell, that energy can be used with relatively high efficiency.

Multiple choice physics current electricity and magnetism electric cells and batteries

Choose the wrong option

  1. A cell is a single unit which converts chemical energy to electrical energy to deliver a voltage while a battery is composed of a number of cells in series to get increased voltage

  2. A Battery is a single unit which converts chemical energy to electrical energy to deliver a voltage while a cell is composed of a number of batteries in series to get increased voltage

  3. In the combination of cells, cells are connected in such a way that negative terminal of a cell is connected to positive terminal of the next cell

  4. In the combination of cells, cells are connected in such a way that negative terminal of a cell is connected to negative terminal of the next cell
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Explanation

Both cell and battery store the chemical energy and then transforms the stored chemical energy to electrical energy. But cell is a single unit with positive and negative terminal whereas battery is a combination of cells connected end to end i.e. positive  to negative terminal.

Multiple choice physics electricity electric cells and batteries

Many devices such as.............. use batteries-

  1. Torches

  2. Transistors, toys

  3. T.V. remote controls

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

Many devices such as----------------use battery 

Torches 
Transistors, toys 
T.V remote controls
All of these use batteries.

Multiple choice physics applications of electromagnets

In which of the following devices is an electromagnet used?
a. Electric tram
b. Loud speaker
c. Telegraph
d. Relay microphone

  1. a

  2. b, c and d

  3. a and b

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

An electromagnet is a temporary strong magnet made from a piece of soft iron when current flows in the coil wound around it. It is an artificial magnet and loses its magnetism when the current is removed. It is used in electric trams, loud speakers, telegraph, relay microphone etc to enhance the effect.

Multiple choice

Electricity can be used to produce...

  1. Thermal energy

  2. Mechanical energy

  3. Sound energy

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

Electricity is a versatile form of energy that can be converted into thermal energy (heaters), mechanical energy (motors), and sound energy (speakers).

Multiple choice

Every circuit needs...

  1. Power source

  2. Pathway

  3. Load

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

A complete electrical circuit requires a power source, a pathway (conductors), and a load (device) to function.

Multiple choice remote sensing remote sensing eyes in the sky and data analysis mapping skills geography

The transmitted energy reaches to a receiving and _____ stations.

  1. Processing

  2. Railway

  3. Work

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

In remote sensing, the energy is recorded by the sensor. After that recorded energy is transmitted to the receiving and processing station where the data are processed into image either in hard copy or digital or both.