Tag: physics

Questions Related to physics

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

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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.

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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.

Food gets cooked faster in a pressure cooker because ___________________.

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. Water starts boiling at a higher temperature due to high pressure

  2. Water boils only at 100 °C but the heat content is higher at high pressure

  3. Water boils only at 100 °C but the heat content is higher at low pressure

  4. Convection currents are set inside the cooker

Show answer
Correct Option: A

A solar cell converts ________ (sound / light) energy to_______ (light /  electrical) energy. Fill the blanks. 

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. Light, electrical

  2. Sound , light

  3. electrical, light

  4. None of the above

Show answer
Correct Option: A