Tag: energy production

Questions Related to energy production

What is the best thing to do when strong winds are blowing over a hut having a weak thatched roof ?

physics energy production causes of greenhouse effect global warming adaptation in animals

  1. Open the doors and windows

  2. Close all the doors and windows

  3. Make holes in the roof

  4. Burn wood inside

Show answer
Correct Option: A
Explanation:

The correct answer is option(A).

High speed winds reduces the pressure above the roof. While the air pressure below the roof is high which pushes the roof upwards. To avoid this we have to open the doors and windows so that air is moving leading to lower pressure in the hut.

What will be the effect of global warming at the poles?

physics energy production causes of greenhouse effect global warming adaptation in animals

  1. Decreasing of temperature

  2. Increasing of temperature

  3. constant of temperature

  4. none of the above

Show answer
Correct Option: B
Explanation:

Due to global warming the temperature of earth's atmosphere in increasing, and the temperature at poles is also increasing. This increase in temperature at poles will melt the ice on poles , and will melt the glaciers and after some time the poles will be iceless. This will result in increase in the level of oceans which in turn may sink the coastal land areas.

The reflector of box type solar cooker need not be adjusted with the position of Sun.

physics energy production solar power plant production of electricity from solar energy solar equipment

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

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Correct Option: B
Explanation:

Box type solar cooker uses a mirror to trap the sunlight inside the box. It needs to adjusted according to the sunlight so that maximum amount of light is trapped inside the box.

Solar water heater can be used in hospitals for hot water supply.

physics energy production solar power plant production of electricity from solar energy solar equipment

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

Show answer
Correct Option: A
Explanation:

Answer is A.

Solar water heating is now a mature technology. Wide spread utilization of solar water heaters can reduce a significant portion of the conventional energy being used for heating water in homes, factories and other commercial and institutional establishments. 
Around 60 deg. 80 deg. C temperature can be attained depending on solar radiation, weather conditions and solar collector system efficiency
Hot water for homes, hostels, hotels, hospitals, restaurants, dairies, industries etc. It can be installed on roof-tops, building terrace and open ground where there is no shading, south orientation of collectors and over-head tank above SWH system.
Hence, the given statement is true.

Solar cell is a device which directly converts _______ into electric energy.

physics energy production solar power plant production of electricity from solar energy solar equipment

  1. heat energy

  2. mechanical energy

  3. chemical energy

  4. solar energy

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Correct Option: D
Explanation:

Solar cell is a device which directly converts solar energy into electric energy.
A solar cell, or photovoltaic cell, is an electrical device that converts the energy of light(sun)  directly into electricity by the photovoltaic effect. It is a form of photoelectric cell, defined as a device whose electrical characteristics, such as current, voltage, or resistance, vary when exposed to light. Solar cells are the building blocks of photovoltaic modules, otherwise known as solar panels.

Solar panels can be used in electronic watches.

physics energy production solar power plant production of electricity from solar energy solar equipment

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

Show answer
Correct Option: A
Explanation:

The statement is true, with upcoming technologies there are solar panels present in watches and these use solar energy to power these watches and for night time there is a small rechargable battery inside the watch,which gets charged enough in day-or during sunlight to power the watch when sunlight is off.

A device when directly converts electric energy into solar energy is called solar cell.

physics energy production solar power plant production of electricity from solar energy solar equipment

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

Show answer
Correct Option: B
Explanation:

The statement is opposite. Solar cell converts solar energy into electrical energy.

The most penetrating atom smashing particle is 

chemistry energy production nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. neutron

  2. proton

  3. alpha particle

  4. deuteron

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Correct Option: A
Explanation:

Neutron has highest penetrating power and low ionizing power. 

So, option A is correct answer.

Boiling water reactor and pressurized water reactors are  

chemistry energy production nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. nuclear reactor

  2. solar reactor

  3. OTEC

  4. Biogas reactor

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Correct Option: A

In a nuclear reactor, heavy water is used as a :

chemistry energy production nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. Controlling material

  2. Moderator

  3. Fuel

  4. Heat exchanger

Show answer
Correct Option: B
Explanation:

Heavy water ($D _{2}O$) is used as moderator. Most of the fast neutrons produced escape from the rod and enter into the moderator. These neutrons make collisions with particles of moderator and slow down.