Tag: solar energy and its applications

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

Which of the following is/are macroscopic variables:

  1. Volume

  2. Temperature

  3. Pressure

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

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

Which of the following are macroscopic properties?

  1. texture

  2. phase

  3. viscosity

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

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

The temperature of the biodigester is kept around $35^{\circ}C$, so as to sustain the fermentation of animal during slurry.

  1. True

  2. False

  3. Ambiguous

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

Answer is A.

This is a complex process by which organic matter is decomposed by anaerobic bacteria. The decomposition process produces a gaseous byproduct often called biogas, which consists primarily of methane, carbon dioxide, and hydrogen sulfide. It occurs in nature and can be used to produce biogas from biomass in an anaerobic digestor. 
To optimize the digestion process, the biodigester must be kept at a consistent temperature, as rapid changes will upset bacterial activity. In most areas of the United States, digestion vessels require some level of insulation and/or heating. Some installations circulate the coolant from their biogas-powered engines in or around the digester to keep it warm, while others burn part of the biogas to heat the digester. In a properly designed system, heating generally results in an increase in biogas production during colder periods.
Hence, the statement is true.

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

The ................ animal dung left after the production of biogas is an excellent manure.

  1. spent

  2. coal

  3. methane

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

The dried manure left after the biogas process is even richer than ordinary muck and makes a fantastic organic fertilizer.
Hence, The spent animal dung left after the production of biogas is an excellent manure.

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

State whether true or false :
In solar dryer, we can keep dried fruits for longer duration of time.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Solar dryer is one of the oldest methods of preserving food for later use.  Foods can  be dried in the sun, in an oven or in a food dehydrator by using the right. So we can dried fruits for longer duration of time.

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

State whether true or false :
Solar dryer works on the principle of conversion of solar energy into heat energy.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The basic function of a solar dryer is to heat air to a constant temperature with solar energy hence Solar dryer works on the principle of conversion of solar energy into heat energy.