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 when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

Major dangers while using electricity are/is

  1. Fire

  2. An electric shock

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
There are two majors dangers while using electricity.they are 
A) Fire 
B) An electric shock.
A fire is caused due to overheating of line wired (or cable) for various reasons such as break if insulation or short-circuiting, etc to avoid it ,one must use wires (or cables) of current carrying capacity higher than the total current which can flow through the circuit when using all the appliances at the same time. An electric shock may be caused from an appliance due to 
i) Poor insulation of wires,
ii) Touching the appliances with wet hands and 
iii) No earthing of the appliance.
To avoid it, the insulation of wires must be of good quality and it should be checked from time to time particularly when they become old, so that no wire is left naked the appliance should never be operated (or touched) with wet hands and they should always be kept dry. The appliances must have its metallic case earthed the appliances must be provided with a fuse.

+ Solution

Multiple choice physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

Mark the incorrect option

  1. The appliances must have its metallic case earthed

  2. The appliances must be provided with a fuse

  3. The appliance should always operated(or touched)with wet hands

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

Touching an appliance with wet hands can cause an electric shock, thus option C is the incorrect statement.

Multiple choice physics electric current through conductors study about cells electric cell types of cells

Three types of electric cells which provide current are:

  1. Button cell, solar cell & secondary cell

  2. Solar cell, electrolytic cell, electro chemical cell
  3. $(A)$ and $(B)$ both are correct
  4. Neither $(A)$ nor $(B)$ is correct
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer is C.

When a primary cell is used, chemical reactions in the battery use up the chemicals that generate the power; when they are gone, the battery stops producing electricity and is useless. In contrast, in a secondary cell, the reaction can be reversed by running a current into the cell with a battery charger to recharge it, regenerating the chemical reactants. 
The types of cells mentioned in option A and option are correct.
Hence, option C is correct.

Multiple choice geography amazing energy energy and uses energy and its different forms energy

Energy of an object by virtue of its position is called _____________.

  1. solar energy

  2. mechanical energy

  3. muscular energy

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

Energy of an object by virtue of its position is called Potential energy.
The potential energy is the type of energy, which a body possesses by virtue of its position is known as the potential energy. Transferable.

Multiple choice geography amazing energy energy and uses energy and its different forms energy

 The energy available from bio gas can be converted into  ______.

  1. heat

  2. light

  3. electricity

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

Theoretically, biogas can be converted directly into electricity by using a fuel cell. However, this process requires very clean gas and expensive fuel cells. In most cases, biogas is used as fuel for combustion engines, which convert it to mechanical energy, powering an electric generator to produce electricity.

Multiple choice physics magnetic effects of electric current direct current types of current movement of charge

In a dry cell

  1. Chemical energy is converted into heat

  2. Electrical energy is converted into electrical energy

  3. Chemical energy is converted into electrical energy

  4. Chemical energy is constant
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A Dry cell is a type of electricity producing chemical cell, commonly used for many home and portable devices , often in the form of batteries. it was developed in 1886 by German scientist Carl Gassner. 

A dry cell  is designed to convert it's chemical energy into electrical energy.
hence option C is correct.

Multiple choice physics simple electric circuits bulbs bulb bulb connected to an electric cell

 An electric bulb converts electrical energy into 

  1. sound energy

  2. mechanical energy

  3. nuclear energy

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

Electric bulb uses the  heating effect of current.when current is passed, electric bulbs has a tungsten filament which gets heated with the flow of current and brighten up, the filament having a high value of resistance heated up , more the heat more will be the light.

Multiple choice physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

Electric doorbell

  1. Always consume power

  2. Consume power only when switch is pressed

  3. Do not consume power practically and needs only starting power

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

When switch is pressed, circuit completes and ringing begins. Hence, electrical energy is converted to sound energy. As switch is released, no current flows and no energy is consumed,

Multiple choice physics sources of energy electricity from water energy hydro electricity hydro energy

Arrange the following steps in the conversion of hydel energy to electricity in a proper sequence.
(a) Released water is made to fall on the blades of the turbines.
(b) Water in the dam is released.
(c) Water is collected in the dam.
(d) Potential energy is converted to kinetic energy.
(e) The armature of the electric generator rotates to produce electricity.

  1. b c d e a

  2. a d b c e

  3. e c d b a

  4. c b d a e
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initially water is collected in the dam. When it is released, the potential energy is converted to kinetic energy. The released water is made to fall on the blades of turbines. The armature of the electric generator rotates to produce electricity.