Tag: generation of electricity

Questions Related to generation of electricity

In parabolic solar cooker, the container of cooking is placed at the :

physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

  1. Centre of curvature of mirror

  2. Focal point of the mirror

  3. Can be placed anywhere

  4. None of these

Show answer
Correct Option: B
Explanation:

In parabolic solar cooker, the container of cooking is placed at the focal point of mirror so that all rays that are falling on solar cooker can converge to one point and produce large amount of heat energy.

The solar device used in traffic signal light, works on which of  the following principle?

physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

  1. Conservation of momentum

  2. Doppler effect

  3. Photovoltaic effect

  4. Electromagnetic induction

Show answer
Correct Option: C
Explanation:

The device used in traffic signal lights is Solar traffic light. are signalling devices powered by solar panels positioned at road intersections, pedestrian crossings and other locations to control the flows of traffic. 


Most solar traffic lights use LED lamps inside. These lamps work on the principle of Photovoltaic effect to work.
Hence correct answer is option C.

State whether true or false :
Water flows in a solar water heater due to the pressure difference between two ends of copper tube.

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  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Water always flow due to pressure difference generated by heat in solar cooker.

True.

State whether true or false :
Solar water heater requires a huge maintenance cost.

physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

  1. True

  2. False

Show answer
Correct Option: B
Explanation:
  1. Clean the glass cover regularly .
    2.Prevent nay shade of the collector.
    3. Be economical with the use of water.
    4.Run the hot water slowly ; this will avoid the mixing of hot and cold water in the storage tank.
    5.Set the thermostat of the electrical backup as low as is comfortable.

    So this what you have to do to maintain your solar cooker as you can see it will require very less cost for maintenance.

State whether true or false :
In order to increase the area absorbing heat energy, coil shaped copper tube is used. 

physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

The box contains copper tubes  bent in the form of a coil (zig-zag shape). This is done to increase the surface area  for absorbing heat.

Which of the following can't be used to make a solar cell?

physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

  1. Silicon

  2. Platinum

  3. Gallium

  4. Germanium

Show answer
Correct Option: B

Of the following converts light energy into electrical energy?

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  1. Motor

  2. Battery

  3. Solar cell

  4. None of these

Show answer
Correct Option: C

Which of the following metals is used as connecting wires that connect solar cells in a solar panel?

physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

  1. Copper

  2. Iron

  3. Aluminium

  4. Silver

Show answer
Correct Option: D
Explanation:

Silver is the metal which is used for connecting wires that connect solar cells in a solar panel, due to its large conductivity.

Which one of the following can be used as a box type solar cooker?

physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

  1. A double walled cooker made of plastic and its inner wall is painted white.

  2. A double walled cooker made of copper and its inner wall is painted black.

  3. A double walled cooker made of plastic and its inner wall is painted black.

  4. A single walled cooker made of copper and its both sides are painted white.

Show answer
Correct Option: B

Solar cell converts what type of energy into electricity?

physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

  1. Heat

  2. Light

  3. Both Heat and Light

  4. Sound

Show answer
Correct Option: B
Explanation:

Solar cell use light energy from photons (basic unit of light energy) and convert it to electricity using semiconductor physics.