Tag: physics

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Questions Related to physics

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

Which of the following devices convert solar energy to electricity

  1. Solar Cooker

  2. Solar Cell

  3. LED

  4. Pressure cooker
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Solar cell converts light energy of sun into electrical energy.

Solar cooker focuses heat energy of sun.
LED and pressure cooker are not related to solar 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

Which of the following uses solar cells?

  1. Natural satellites

  2. Water dams

  3. Artificial satellites

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

Solar cells have access only to the solar energy and chemical energy (battery embedded in satellite system). However, chemical energy is limited. Hence, solar energy is the standard source of energy used in satellites.

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

Why do solar cells have a great future?

  1. They provide a clean source of energy.

  2. Supply of energy from sun is unlimited.

  3. The cost of conventional sources of energy is rising while cost of solar cells is reducing.

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

Solar cell produces pure electricity with no waste products and is environment friendly. 

Solar energy is unlimited, so solar cells have the ability to produce enormous electrical energy. 
With improvement in manufacturing technologies and use of ICs, cost of solar cells is reducing. However, with depletion of natural resources conventional sources of energy are getting costlier. 

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

Which of the following materials play a key role in the functioning of a solar cell

  1. Silicon

  2. Glass

  3. Plastic

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

When light energy is incident on Si, it is converted to electricity by the principle of photovoltaic effect. GaAs, InP are other materials with similar property. 

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 cost of solar cells is

  1. decreasing exponentially

  2. decreasing slowly

  3. constant

  4. increasing
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The cost of solar cells is reducing exponentially.

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 use of solar energy on large scale becomes harder because:

  1. Its installation cost is often more than conventional systems.

  2. Storing of large amounts of D.C. is not easy.

  3. It requires a huge area of exposure to sunlight to gather substantial energy.

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

Solar energy production on a large scale is difficult on a large scale because:

1. Its installation cost is much more than conventional systems because of the delicate substances.
2. Output of solar energy conversion is DC and storing DC is difficult and costly on a large scale.
3. To efficiently supply the demands on large scale, huge areas of land are required to get sufficient exposure of Sun.

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

Solar cooker is painted black from inside so that:

  1. Less heat is lost

  2. Less heat is radiated

  3. More heat is amplified

  4. More heat is trapped
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Black surfaces are good absorbers and good radiators of heat and hence painting the surface black traps more heat and improves the efficiency of solar cooker.

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 reflector on top of solar cooker is used to:

  1. diverge solar energy

  2. focus solar energy

  3. focus light energy

  4. reflect excess energy to surroundings
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The reflector on the top of the solar cooker is used to focus the solar energy over the glass surface. The mirror reflects the heat energy in a confined area and increases the net input energy to the solar cooker.

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 semiconductor panel on the front of a scientific calculator is

  1. Electric Cell

  2. Solar Cell

  3. Plane mirror

  4. Convex mirror
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Solar cells are fitted on a scientific calculator.