Tag: renewable and non-renewable sources of energy

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Questions Related to renewable and non-renewable sources of 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

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.

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 cell production is

  1. increasing slowly

  2. increasing exponentially

  3. constant

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

Production of solar cells is increasing exponentially every year.

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

What is the principle of working of solar cell

  1. photovoltaic effect

  2. green house effect

  3. Archimedes' principle

  4. Faraday's law
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Solar cell works on the principle of photovoltaic effect according to which free electrons are produced when light of certain wavelength is incident on semiconductors.

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 adjustable because of:

  1. revolution of Earth about Sun.

  2. rotation of Earth about Sun.

  3. atmospheric profile of gases.

  4. density variation in atmosphere.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rotation of Earth about the Sun causes the position of Sun to change during the day. Hence, the mirror on the top of the solar cooker needs adjusting during the day to focus the rays in a small area.

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

A solar cooker works on:

  1. electrical energy

  2. magnetic energy

  3. solar energy

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

Solar cooker is a device used to collect the solar energy in the form of heat.

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 will improve the efficiency of a solar cooker? 

  1. Regularly orienting the solar cooker according to the Sun.

  2. Increasing the span of glass sheet on the top.

  3. Using black coated utensils.

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

To improve the efficiency of a solar cooker, the following steps need to be done:

1. The top mirror of the solar cooker focusses the solar energy onto a small area. Adjusting the mirror helps in continuous focussing of heat energy.
2. Increasing the span of glass sheet on the top allows trapping more energy in the solar cooker.
3. Black coated utensils increases the absorption of heat radiations and increases the efficiency.  

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

What is solar cooker?

  1. Device which uses energy of direct sunlight to cook food

  2. Device which uses energy of direct falling water to cook food

  3. Device which uses energy of direct wind to cook food

  4. Device which uses energy of direct thermal energy to cook food
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Solar cooker is a device that uses energy from the Sun directly to cook food or warm fluids.

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

How heat is generated in solar cooker to cook food?

  1. Light reflected from plane mirror concentrates solar energy inside solar cooker

  2. Light refracted from plane mirror concentrates solar energy inside solar cooker

  3. Light deflected from plane mirror concentrates solar energy inside solar cooker

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Concave or plain mirror are used on the top cover of the cooker. Light get reflected from these mirrors, these mirrors concentrates the light onto a point or a region where the food is kept to be cooked.