Tag: save energy

Quizzes (2) Questions (48)

Questions Related to save energy

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

Which of the following is used to produce electricity?

  1. Water

  2. Biomass

  3. Thermal power

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

Water is a source of hydel energy.
Biomass helps to produce biogas in rural areas.
Thermal power plants produce electricity by burning of coal.
All of them are sources of energy and produce electricity.

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

Choose the correct statement.

  1. Power of magnets in hydro power plants increases with time.

  2. Magnets are involved in the generation of electricity in hydro power plants.

  3. In hydro power plants, magnetic energy is converted into electrical energy.

  4. In hydro power plants, electrical energy is converted into magnetic energy.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Magnets slowly lose their strength with time.

In hydro power plants, kinetic energy from water is converted to electrical energy. This is done with the help of magnets. A coil is rotated (from kinetic energy of water) between two magnets to generate electricity.

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

Which of these is not related to energy efficiency?

  1. Useful energy
  2. $kW$

  3. Heat

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

Energy efficiency measures how much of energy is put into device to do intended job. So, it is related to useful energy, heat and energy transformation.
$kW$ or kilowatts are unit used to measure amount of electric power.