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 electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

Which instrument is not used to convert electric energy into heat energy?

  1. Room heater

  2. Electric Iron

  3. Electric Bell

  4. Electric water heater
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Electric Bell is not used to convert electric energy into heat energy as there is no  use of heat in functioning of an electric bell.In electric bell electrical energy is used to convert sound energy.First it converts electric energy into mechanical energy and which is used to produce sound energy.

Therefore,C is correct option.

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

We should not use many electrical appliances simultaneously. True/False?

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When many appliances are switched on simultaneously, a lot of current flows through the main circuit and the current may exceed the permissible amount. This causes overloading and may cause a fire. Thus many electrical appliances should not be used simultaneously.

Multiple choice india: security setup overview of india general knowledge

Cryogenic Engine is used in ___________.

  1. Boeing aircraft

  2. High speed rail engines

  3. Space shuttle

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

Cryogenic engines use liquid oxygen and liquid hydrogen as propellants and are essential for space launch vehicles (like the GSLV) to achieve the high thrust needed for space missions.

Multiple choice geography irrigation and power generation of electricity exploration and conservation of minerals secondary sector : industry

In which of the following countries thermal electricity is used at large scale?

  1. U.S.A

  2. Japan

  3. Europe

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

Thermal electricity, primarily generated from coal, is a major energy source globally. The USA, Japan, and European nations all rely heavily on thermal power plants for their electricity needs.

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

A system where there is exchange of energy but not of mass is called _________ system.

  1. insulated

  2. isolated

  3. open

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

In thermodynamics, a closed system can exchange energy (as heat or work) but not matter, with its surroundings. An isolated system cannot exchange any heat, work, or matter with the surroundings, while an open system can exchange energy and matter.

Multiple choice economics environment and sustainable development need for sustainable development environmental economics sustainable development

Non-commercial energy sources account for over ______ of the total energy consumption. 

  1. 35%

  2. 30%

  3. 40%

  4. 38%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Non-commercial energy sources contains energy sources like cowdung, firewood, etc. 
Mainly rural areas are highly dependent upon these sources, as it's provided by nature without any amount which is almost unlimited. But, it's bad for environment, burning of these fuel causes air pollution. 
Multiple choice economics environment and sustainable development need for sustainable development environmental economics sustainable development

Electricity is a _____________.

  1. primary energy resource

  2. final energy resource

  3. both (a) and (b)

  4. neither (a) nor (b)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electricity is a secondary energy source, meaning it is converted from primary sources like coal or wind. It is classified as a final energy resource because it is the form of energy delivered to the end consumer.

Multiple choice economics environment and sustainable development need for sustainable development environmental economics sustainable development

___________ measures the operational efficiency of a Thermal Plant.

  1. Power Load Factor

  2. Power Leakage Factor

  3. Plant Load Factor

  4. Plant Leakage Factor
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plant Load Factor (PLF) is the ratio of the actual energy generated by a power plant to the maximum possible energy that could have been generated if it operated at full capacity for the entire period.

Multiple choice economics environment and sustainable development need for sustainable development environmental economics sustainable development

Electricity generated from coal, oil and gas is known as ________.

  1. hydro electricity

  2. thermal electricity

  3. electro electricity

  4. atomic electricity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electricity generated by burning fossil fuels like coal, oil, or gas to produce steam that drives turbines is known as thermal electricity.

Multiple choice

Which of the following is NOT an actuator?

  1. Electric fan

  2. Thermostat

  3. Heater

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

An actuator is a component that performs an action (like moving or heating). A thermostat is a sensor that measures temperature, not an actuator.