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

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.

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 fixed at the top of solar cooker?

  1. Plane mirror or concave mirror

  2. Convex mirror

  3. bifocal mirror

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

Concave or plain mirror is used in the solar cooker in order to concentrate the sunlight at one spot.

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 colour is the interior of solar cooker?

  1. White

  2. Black

  3. Purple

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

Interior of the solar cooker is painted black inorder to absorb maximum of the Sun's light falling on the device.

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 is NOT an advantage of solar cooker?

  1. It has no moving parts.

  2. It requires a lot of maintenance.

  3. It can be used in remote areas.

  4. It does not cause any pollution.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Solar panel is a very useful device. Some of its major advantages are:

1. As it has no moving parts during operation, energy loss due to friction is absent.
2. It can be used in any region where there is sufficient sunlight.
3. It does not cause any pollution and produces no byproducts.

The disadvantage with solar cooker is that it requires a lot of maintenance. The mirrors and the glass need to be kept clean. The orientation of mirrors need to be changed at regular times in a day as sun changes its position.