Radiation from the sun is used to cook food

Electricity is used to cook food

Chemical energy is converted to electrical energy

Heat energy is converted light energy

$$\displaystyle { -273 }^{ o }C$$

$$\displaystyle { -273 }^{ o }F$$

$$\displaystyle { -273 }^{ o }K$$

MCQ Questions for Class 11 Engineering Physics Thermal Properties Of Matter Quiz 2

The perfect gas equation for 4 gram of hydrogen gas is :

0%
$PV=RT$
0%
$PV= 2RT$
0%
$PV$ = $\displaystyle\ \frac{1}{2} RT$
0%
$PV = 4RT$

Explanation

$n$ =

$\displaystyle\ \frac{4}{2} = 2$ (number of moles)

$\Rightarrow PV=2RT$

In the steady state, the two ends of a metel rod are at

$30^oC$ and

$20^oC$ . The temperature at the 60th cm is

0%
$22^oC$
0%
$23^oC$
0%
$24^oC$
0%
$25^oC$

Explanation

Given the rod is in steady state, and of one meter length.
Temperature gradient is a constant.

$\dfrac{dT}{dx} = c$

$dT = cdx$

$T = cx +a$ ; Substituting the conditions that T(0) = 30 and T(100) = 20;

$T = -0.1x + 30;$
putting T(60) we get

$T(60) = -6 + 30 = 24^{\circ}C$

The deviation of gases from the behaviour of ideal gas is due to :

0%
colourless molecules
0%
covalent bonding of molecules
0%
attraction of molecules
0%
absolute scale of temperature

Absolute zero is obtained from

0%
$P - V$ graph
0%
$P - \displaystyle{\frac{1}{V}}$ graph
0%
$P - T$ graph
0%
$V - T$ graph

Explanation

$P\propto T$ If

$V$ is constant, where

$P$ is pressure of certain amount of gas and

$T$ is absolute zero temperature.

The solar heat and light reach the earth via

0%
radiation
0%
conduction
0%
convection
0%
all of these

Heat is not transferred by the process of convection in:

0%
solid
0%
liquid
0%
gas
0%
none of the above

For a liquid, the coefficients of apparent expansion '

${\gamma}_{a}$ 'and real expansion '

${\gamma}_{r}$ ' are related as:

0%
${\gamma}_{a}={\gamma}_{r}$
0%
${\gamma}_{a}<{\gamma}_{r}$
0%
${\gamma}_{a}>{\gamma}_{r}$
0%
$\displaystyle\frac{{\gamma}_{a}}{{\gamma}_{r}}=constant$

Explanation

$\gamma_r=\gamma_a + \gamma_g$ where;

$\gamma_r$ is the real expansion,

$\gamma_a$ is the apparent expansion and

$\gamma_g$ is the expansion of the vessel. Hence,

$\gamma_a < \gamma_r$

The fastest mode of transfer of heat is

0%
conduction
0%
convection
0%
radiation
0%
all the above three

Heat transfer is done by:

0%
convection
0%
cooling
0%
expansion
0%
none of the above

In convection, heat is transferred

0%
Upwards
0%
Downwards
0%
Sideways
0%
In all directions

In vacuum, heat is transferred by

0%
conduction
0%
convection
0%
radiation
0%
all the above three

The nature of the graph of pressure 'P' against reciprocal of volume 'V' of an ideal gas at constant temperature is

0%
a straight line not passing through origin
0%
a parabola
0%
a straight line passing through origin
0%
a rectangular hyperbola

Iron, hydrogen peroxide and carbon dioxide. When same amount heat is supplied to these three substances, which expands most?

0%
Hydrogen peroxide
0%
Carbon dioxide
0%
Iron
0%
All of these

The first thermometer was developed by :

0%
Joule
0%
Fahrenheit
0%
Galileo
0%
Watt

Explanation

$Answer:-$ C

Galileo Galilei is often claimed to be the inventor of the thermometer. However the instrument he invented could not strictly be called a thermometer: to be a thermometer an instrument must measure temperature differences; Galileo's instrument did not do this, but merely indicated temperature differences. His instrument should rightly be called a thermoscope.

The Thermoscope:-
The predecessor to the thermometer, the thermoscope is a thermometer without a scale; it indicates differences in temperature only ie it can show if the temperature is higher, lower or the same, but unlike a thermometer it cannot measure the difference nor can the result be recorded for future reference. The thermoscope was widely used by a group of scientists in Venice that included Galileo. It was only a small step from the thermoscope to the thermometer.

In Solar cooker:

0%
Electricity is used to cook food
0%
Chemical energy is converted to electrical energy
0%
Radiation from the sun is used to cook food
0%
Heat energy is converted light energy

A beaker is completely filled with water at

$4^{\circ}C$ . It will overflow if

0%
heated above $4^{\circ}C$ .
0%
cooled below $4^{\circ}C$ .
0%
both heated and cooled above and below $4^{\circ}C$ respectively.
0%
none of the above.

Explanation

Volume of water is minimum at

$4^{\circ}C$ . It will overflow if both heated and cooled above & below

$4^0C$ respectively.

The heat energy emitted by sun reaches the earth through:

0%
Conduction
0%
Convection
0%
Radiation
0%
None

The most commonly used thermometric liquid is :

0%
water
0%
alcohol
0%
mercury
0%
None of these

Explanation

$Answer:-$ C

Most metals are good conductors of heat and they are solids at room temperature. Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer.

Radiation depends on:

0%
the temperature of the substance
0%
the colour of the substance
0%
both the above
0%
none of these

Which of the following will rise the highest?

0%
Air at $10^{\circ}C$
0%
Air at $40^{\circ}C$
0%
Air at $20^{\circ}C$
0%
Air at $-5^{\circ}C$

Explanation

$Answer:-$ B

Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. So, more warmer air will rise highest.

The phenomenon involved in sea breeze and land breeze is

0%
Convection
0%
Conduction
0%
Radiation
0%
None

Explanation

$Sea \ breeze:$ They are formed during the day time when land and sea both are heated equally by the sun, but land is heated up more quickly, thus air above land due to heat becomes lighter and rises up due to $convection.$ Thus pressure decreases and cold and humid air above the sea blowing towards land.

$Land \ breeze:$ They are formed during the night when sea water and land both lose heat. Land loses heat energy fast and cools more rapidly as compared to the sea. Sea water being at higher temperature, the air becomes lighter and rises up due to $convection$ . So air from land starts blowing towards the sea and gives rise to a land breeze.

In both the processes, the transfer of heat takes place by actual movement of the particles of the medium.

Absolute zero is

0%
$\displaystyle { -273 }^{ o }C$
0%
$\displaystyle { -273 }^{ o }F$
0%
$\displaystyle { -273 }^{ o }K$
0%
None of these

When water is heated from

$0^{\circ}C$ to higher temperatures, its volume

0%
increases
0%
decreases till $4^{\circ}C$ and then increases
0%
remains the same
0%
first increases then decreases

Explanation

At zero degree water is in its solid form.

As the temperature increases from

$0^o$ to

$4^o$ , we notice that the volume is decreasing. At

$4^oC$ , a given amount of water has the smallest volume that means it has highest density at this point.

If the temperature is bigger than

$4^o$ , the volume of water will start increasing and as a result the water will be less dense. If the temperature is between

$0^oC$ to

$4^oC$ , the water will increase in volume and become less dense.

The value of gas constant

$R$ (in cal/mol-K) for hydrogen is :

0%
$\displaystyle\frac{1}{2}$
0%
$2$
0%
$4$
0%
$1$

Explanation

Numerical Values of the Gas Constant, R in Varius Units

Units	Numerical Value
L-atm / mol-K	0.08206
cal/mol-K	1.987
J/mol-K	8.314
$m^3$ -Pa/mol-K	8.314
L-torr/mol-K	62.36

It is approximately

$2 cal/mole-Kelvin$ . We can convert the 8.314 SI units to calories units by simply converting the units to their respective required units.

The speed at which heat energy is propagated in vacuum is approximately :

0%
$3 \times {10}^{-8} {m}/{s}$
0%
$3 {m}/{s}$
0%
$3 \times {10}^{8} {m}/{s}$
0%
$3 \times {10}^{10} {m}/{s}$

Explanation

In vacuum, there is no medium therefore heat energy is propagated by radiation (conduction and convection are not possible), which travels at the speed of

$3\times10^{8}m/s$ in vacuum .

The radiation of an electric room heater is most effective when it is :

0%
uncleaned
0%
polished to shine
0%
painted green
0%
painted black

The temperature, to which a gas must be cooled before it can be liquified by pressure alone, is known as its

0%
Saturation point
0%
Freezing point
0%
Liquification temperature
0%
critical temperature

The air becomes heated by

0%
Conduction
0%
Convection
0%
Radiation
0%
Expansion
0%
Diffusion

Essential requirement to propagation Heat energy:

0%
no medium
0%
gaseous medium
0%
solid medium
0%
liquid medium

Water in a container is heated from

$0^{\circ}$ to

$10^{\circ}C$ . Its volume :

0%
increases for the full given range (from $0^{\circ}$ to $10^{\circ}C$ )
0%
decreases up to $4^{\circ}$ , then increases
0%
increases up to $4^{\circ}C$ , then decreases
0%
decreases for the full range (from $0^{\circ}$ to $10^{\circ}C$ )

Explanation

As water has maximum density at

$4^oC$ . So going from

$0^oC$ to

$10^oC$ .

First its volume decreases upto

$4^oC$ , making density maximum and then increases to lower the density again.

Transmission of heat by the movement of heated particles is called

0%
Conduction
0%
Convection
0%
Radiation
0%
Regelation
0%
Expansion

In convection currents, heat is transferred upwards

0%
horizontally
0%
diagonally
0%
vertically
0%
none of these

When water is heated from

$0^\circ C$ , its volume will

0%
decrease till $4^\circ C$ then increase
0%
decrease till $4^\circ C$
0%
remain the same
0%
first increase then decrease

By the process of convection the transfer of heat is always-

0%
upwards
0%
downwards
0%
sideways
0%
in all possible directions

When surface water in a lake is just going to freeze, then what is the temperature of water at the bottom?

0%
Less than $0^{\circ} C$
0%
$0^{\circ}C$
0%
$4^{\circ}C$
0%
More than $4^{\circ} C$

Explanation

Explanation:

$\bullet$ During the freezing of the water, cold water that turns into ice comes on top of the surface while warm water goes down.

$\bullet$ Water’s freezing temperature is 0°C. So, warm water which is at below than top of the surface, should have more density. Water’s density is more at 4°C than at 0°C . So, temperature will be 4°C.

$Answer:$

Hence, option C is the correct answer.

The continuous movement of a fluid when heated is called :

0%
convectional current
0%
conduction current
0%
electric current
0%
magnetic current

The most commonly used themometric substance is

0%
water
0%
alcohol
0%
mercury
0%
none of these

Absolute zero temperature corresponds to

0%
$-273\:K$
0%
- $273^\circ C$
0%
$273^\circ C$
0%
none of these

Absolute zero corresponds to

0%
-273 K
0%
273 $^o$ C
0%
273 $^o$ R
0%
none of these

State True or False.

Mass of water at

$\displaystyle 10^{\circ}C$ increases when heated to

$\displaystyle 30^{\circ}C$ .

0%
True
0%
False

Explanation

When a substance is heated its volume increases and its density decreases.

Considering anomalous expansion of water, after

$4^oC$ its expansion is normal like the expansion of other liquids.

Because the mass is constant the volume of water increases.

Hence the sentence is false.

The most commonly used thermometric substance is

0%
water
0%
alcohol
0%
mercury
0%
none of these

State whether true or false.

The density of water at

$\displaystyle 10^{\circ}C$ increases when heated further.

0%
True
0%
False

Explanation

The density of water is maximum at

$4^oC$ and further heating to

$10^oC$ the density decreases with temperature.

Heat transfer through radiation cannot take place in vacuum. True or false

0%
True
0%
False

The only liquid which is a good conductor of heat is-

0%
water
0%
turpentine
0%
alcohol
0%
mercury

Explanation

The liquid which is good conductor of heat is mercury.

Thermal conductivity is

$8.30W/(mK)$ of mercury.

During day time the air becomes warm due to the process of-

0%
conduction
0%
convection
0%
radiation
0%
expansion

The liquids and gases only have cubical expansion. True or false.

0%
True
0%
False

Explanation

The liquids and gases are measured in volumes, so through cubical or volume expansion the change in them is measured.

$\gamma =\cfrac { 1 }{ V } \cfrac { dV }{ dT }$

$\gamma$ is cubical expansion coefficient

Convection cannot take place in_______

0%
solids
0%
liquids
0%
gases
0%
None of the above

The rate at which a body radiates heat depends on-

0%
its temperature
0%
its colour
0%
its nature (dull or shiny)
0%
all of these

A device in which heat loss due to conduction, convection and radiation is minimized is :

0%
solar cooker
0%
thermos flask
0%
thermometer
0%
electric heater

State whether given statement is True or False
The heat coming from the sun travels by convection

0%
True
0%
False

CBSE Questions for Class 11 Engineering Physics Thermal Properties Of Matter Quiz 2 - MCQExams.com

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Practice Class 11 Engineering Physics Quiz Questions and Answers

CBSE Questions for Class 11 Engineering Physics Thermal Properties Of Matter Quiz 2 - MCQExams.com

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Practice Class 11 Engineering Physics Quiz Questions and Answers

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