Tag: solar energy and its applications

Questions Related to solar energy and its applications

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

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  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?

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  1. Heat

  2. Light

  3. Both Heat and Light

  4. Sound

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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

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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

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Correct Option: A

Photo voltaic cells use _________ to produce 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. water stored by a dam

  2. heat energy of coal or petroleum

  3. wind energy

  4. solar energy

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Correct Option: D

The efficiency of a solar cell is 20% and its surface area is $4  {cm}^{2}$. Find the electrical energy generated in one second, by 3000 cells, connected in a solar panel, if $640  J$ of solar energy is incident on one meter square area, in one second.

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. 183.6 J

  2. 153.6 J

  3. 193.6 J

  4. 123.6 J

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Correct Option: B
Explanation:

The total surface area of solar cells on which solar energy is falling = area of each cell $\times$ number of cells $= 4 \times 3000 {cm}^{2} = 1.2  {m}^{2}$
The solar energy falling on 3000 cells 
${Q} _{1} = 1.2 \times 640  J = 768  J$
The energy converted into electric energy $= \displaystyle\frac{20}{100} \times 768 = 153.6  J$
The electric energy generated in one second is $153.6  J$

The temperature in a spherical reflector type solar cooker is raised to above $500 ^oC$ by :

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. concentrating energy at one point by using a concave reflector

  2. proper insulation of the cooker

  3. concentrating energy at one point by using a convex reflector

  4. Both (A) and (B)

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Correct Option: D

State whether true or false :
We can also prepare food on a cloudy day through solar cooker.

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  1. True

  2. False

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Correct Option: B
Explanation:

No On cloudy day solar cooker did not get sufficient amount of sunlight to produce heat energy for cooking.

State whether true or false :
We can adjust parabolic solar cooker in such a way so that the mirror moves with the sun in order to face the sun always. 

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

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Correct Option: A
Explanation:

If we did not adjust the parabolic mirror in solar cooker according the  movement of sun then all ray of sunlight cannot converge at one point .hence  with time we will get lesser amount of heat energy.

Increasing the surface area of 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. increases the current and the power output.

  2. increases the voltage and the power output.

  3. decreases the current output but increases the power output.

  4. has no effect.

Show answer
Correct Option: A
Explanation:

Output of solar cell occurs at a constant voltage. Using a group of solar cells in the solar panel increases the amount of current produced. Also, as area is increased more solar energy is captured and more electrical energy is produced.