Tag: solar equipment

Questions Related to solar equipment

Which of the following is/are macroscopic variables:

physics energy management solar power plant production of electricity from solar energy solar equipment solar energy and its applications

  1. Volume

  2. Temperature

  3. Pressure

  4. All of the above

Show answer
Correct Option: D
Explanation:

Macroscopic variable is a measurable quantity used to describe the complete state of the system. The state of a macroscopic system in equilibrium can be described in terms of measurable properties as temperature, pressure, and volume, which are also known as thermodynamic variables.

Which of the following are macroscopic properties?

physics energy management solar power plant production of electricity from solar energy solar equipment solar energy and its applications

  1. texture

  2. phase

  3. viscosity

  4. all of the above

Show answer
Correct Option: D
Explanation:

$Answer:-$ D

Macroscopic properties are qualities that can be seen by the naked eye, and some are relative to the conditions under which a material or element is observed. The three most basic examples of macroscopic properties are color, shape and size.

Other examples of macroscopic properties include texture, phase (solid, liquid or gas), viscosity (if any) and density relative to surroundings (such as oil on water). The properties of an element or material tend to change, even if only slightly, as the conditions change. Examples of changing conditions include how metals tend to glow red when heated to extreme temperatures, how the viscosity of honey decreases with temperature or how the volume of $H _2O$ increases slightly when it freezes.

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

Show answer
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

Show answer
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.