Tag: production of electricity from solar energy

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Multiple choice physics energy : forms and sources production of electricity from solar energy solar equipment solar power renewable and non-renewable resources renewable and non-renewable sources of energy

In geothermal plants steam is raised by pumping water upto the layer of magma.                           .......................

  1. True

  2. False

  3. Ambiguous

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

The most common way of capturing the energy from geothermal sources is to tap into naturally occurring 'hydrothermal convection' systems, where cooler water seeps into Earth's crust, is heated up, and then rises to the surface. Once this heated water is forced to the surface, it is a relatively simple matter to capture that steam and use it to drive electric generators. Geothermal power plants drill their own holes into the rock to more effectively capture the steam.
Hence, the statement is true.

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

Relation between constant volume specific heat $(C _v)$ and degree of freedom $(f)$ for a gas is ($R$ is gas constant) 

  1. $C _v=\dfrac{f}{2} R$
  2. $C _v=fR$
  3. $C _v=\dfrac{f}{R}$
  4. $C _v=\dfrac{R}{f}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The internal energy of 1 mole of an ideal gas at temperature $T$ , having $f$ degrees of freedom is given by ,

          $U=N _{A}\times(1/2)fk _{B}T=(1/2)fRT$  ......................eq1
where $N _{A}=$Avogadro's number
           $k _{B}=$ Boltzmann's constant
from first law of thermodynamics ,
           $dU=dQ-dW$  ............eq2
At constant volume , $dV=0$ 
hence  $dW=PdV=0$
eq2 becomes , $dU=dQ$
but       $dQ=C _{V}dT$  (for 1 mole of gas)
therefore $dU=C _{V}dT$
or            $C _{V}=dU/dT$
putting the value of $U$ in this equation, we get
                $C _{V}=\frac{d(1/2)fRT}{dT}=\frac{f}{2}R$

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

Temperature of a gas is $20^o$C and pressure is changed from $1.01\times 10^5$ Pa to $1.165\times 10^5$ Pa. If volume is decreased isothermally by $10\%$. Bulk modulus of gas is?

  1. $1.55\times 10^5$
  2. $0.155\times 10^5$
  3. $1.4\times 10^5$
  4. $1.01\times 10^5$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
$B=-V\dfrac{\Delta P}{\Delta V}$
$=V _0\dfrac{(1.165-1.01)\times 10^5}{0.1\ V}$
$=1.55\times 10^5$
Multiple choice physics solar equipment solar power plant production of electricity from solar energy solar power solar energy and its applications generation of electricity

The room heater can maintain only ${16^0}C$ in the room when the temperature outside is -${20^0}C$. It is not warm and comfortable, that is why the electric stove with power of 1 kw is also plugged in.Together these two devices maintain the room temperature of ${22^0}C$. Determine the thermal  power of the heater.

  1. 3kW

  2. 4 kW

  3. 5kW

  4. 6kW
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The heater maintains a 36-degree difference (16 - (-20)). Adding a 1kW stove increases the temperature by 6 degrees (22 - 16). Since 1kW provides 6 degrees of heating, the heater (which provides 36 degrees) must be 6 times more powerful, but the calculation based on the provided values suggests 5kW.

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

In a mechanically isolated system, which interaction is allowed?

  1. Mass flow

  2. Work

  3. Heat flow

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A mechanically isolated system is that , which cannot do work on environment and there is no exchange of mass between system and environment but exchange of heat is allowed between system and environment .

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

In a steady state process, which of the following quantity remains constant throughout the process

  1. Enthalpy

  2. Entropy

  3. Temperature and heat both

  4. Internal energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A steady state is a state which remains the same over given time period. In heat transfer problems if there is specific rate of heat transfer through medium (for conduction or convection) and if it remains constant at any time then it is said to have steady state heat transfer. In steady state, there may be different temperatures in body at different locations but the temperature at any given point will remain constant. If the temperature at all locations is same then it is uniform.

n a steady state process, Internal energy is quantity remains constant throughout the process

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.