Tag: physics

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Multiple choice 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

Photo voltaic cells use _________ to produce electricity.

  1. water stored by a dam

  2. heat energy of coal or petroleum

  3. wind energy

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

Photovoltaic cells, commonly known as solar cells, convert light energy directly into electricity. They utilize the photovoltaic effect to generate current when exposed to solar radiation.

Multiple choice 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

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.

  1. 183.6 J

  2. 153.6 J

  3. 193.6 J

  4. 123.6 J
Reveal answer Fill a bubble to check yourself
B Correct answer
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 $153.6  J$

Multiple choice 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

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

  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)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A spherical reflector (concave mirror) concentrates solar rays to a single focal point, significantly increasing the temperature. Proper insulation of the cooker is also essential to minimize heat loss to the surroundings, allowing the temperature to reach high levels.

Multiple choice 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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

Multiple choice 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

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. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice 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

Increasing the surface area of a solar cell 

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice 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

State whether true or false :
Solar Energy doesn't cause any pollution.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Solar energy systems/power plants do not produce air pollution, water poullution, or greenhouse gases. ... However, some toxic materials and chemicals are used to make the photovoltaic (PV) cells that convert sunlight into electricity.

Multiple choice 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

In order to absorb more heat, the outer surface of copper tube of solar water heater is coloured with :

  1. Red

  2. Yellow

  3. Black

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

Among all colour black is the best absorber for heat  so outer surface of copper tube is coloured with black.

Multiple choice 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

Two identical immersion heaters are to be used to heat water, in a large container. Which one of the following arrangement would heat the water faster :
Give reasons for your answer.

  1. Connecting the heaters in series with the main supply,

  2. Connecting the heaters in parallel with the main supply,

  3. Connecting the heaters in series and parallel with the main supply,

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer