CBSE Questions for Class 11 Engineering Physics Thermal Properties Of Matter Quiz 8 - MCQExams.com

State whether given statement is True or False
Radiant heat can easily pass through air
  • True
  • False
State reason for unsolidification of water inside lakes in cold countries?
  • anomalous expansion of water
  • thermal conductivity of water
  • High specific heat capacity of water
  • Data insufficient
When water cools below $$4^\circ{}$$ C, its volume
  • increases.
  • decreases.
  • remain constant.
  • Data insufficient
If the pressure of the gas contained in a vessel is increased by $$0.4$$%, when heated through $$\displaystyle { 1 }^{ \circ  }C$$. What is the initial temperature of the gas?
  • $$\displaystyle 250K$$
  • $$\displaystyle { 250 }^{ \circ }C$$
  • $$\displaystyle 2500K$$
  • $$\displaystyle { 25 }^{ \circ }C$$
We consider the radiation emitted by the human body. Which of the following statements if true?
  • The radiation is emitted during the summers and absorbed during the winters
  • The radiation emitted lies in the ultraviolet region and hence is not visible
  • The radiation emitted is in the infra-red region
  • The radiation is emitted only during the day
Identify the statement in which the mode of heat transfer is convection ?
  • The heat of the sun warming our planet
  • The heat from an electric stove warming a frying pan
  • Ice cubes cooling a drink
  • A microwave oven cooking a meal
  • An overhead fan cooling a room
Heat travels through vacuum by:
  • convection
  • radiation
  • conduction
  • of all these
At $$\displaystyle { 10 }^{ \circ  }C$$, the value of the density of a fixed mass of an ideal gas divided by its pressure is $$'x'$$, at $$\displaystyle { 110 }^{ \circ  }C$$ this ratio is:
  • $$\displaystyle \frac { 10 }{ 110 } x$$
  • $$\displaystyle \frac { 383 }{ 283 } x$$
  • $$\displaystyle \frac { 110 }{ 10 } x$$
  • $$\displaystyle \frac { 283 }{ 383 } x$$
Describe the anomalous expansion of water?
  • When cooled below 4 degrees Celsius, it starts expanding until it becomes ice at 0 degrees Celsius
  • When cooled below 4 degrees Celsius, it starts contacting until it becomes ice at 0 degrees Celsius
  • When cooled below 4 degrees Celsius, it's volume remains same until it becomes ice at 0 degrees Celsius
  • None of the above
In which of the following phenomena, the heat waves travel along straight lines with the speed of light?
  • Thermal conduction
  • Forced convection
  • Natural convection
  • Thermal radiation
Choose the correct statement from the following
  • Woollen clothes keep the body warm in winter as air is the bad conductor of heat
  • Shining surfaces are good reflectors of heat
  • Heat radiations travel with speed of light
  • The SI unit of coefficient of cubical expansion is $$K^{-1}$$
The temperature of a 3 kg block of aluminium increased by 3 degrees. How much heat would be needed to raise the temperature of a 9 kg block of aluminum by 3 degrees?
  • 9 times as much heat as the 3 kg block
  • 3 times as much heat as the 3 kg block
  • the same amount of heat as the 3 kg block
  • one-third as much heat as the 3 kg block
  • one-ninth as much heat as the 3 kg block
A  gas in a flexible container initially has volume of 320 L. If we decrease the pressure of the gas from 4.0 atm to 1.0 atm and decrease the temperature form 273 degrees Celsius to 0 degrees Celsius, what is the new volume of the gas?
  • 0 L
  • 320 L
  • 160 L
  • 640 L
  • 80 L
A closed container of volume V contains an ideal gas at pressure P and Kelvin Temperature T. The temperature of the gas is changed to 4T due to passing heat to the container. Choose correct pairs of pressure and volume after change of the temperature.
  • $$P\;and \;V$$
  • $$\displaystyle P\;and \frac{1}{2}V$$
  • $$4\;P\;and \;4\;V$$
  • $$4\;P\;and \;V$$
  • $$\displaystyle \frac{1}{4}\;P\;and\;V$$
Heat can be transferred to the inside surface of the walls of the container by which of the above?  
488309.PNG
  • I only
  • I and II only
  • I and III only
  • II only
  • I, II, and III only
In a mercury thermometer, the ice point is marked as $$10^o$$ and the steam point is marked as $$130^o$$. At $$40^oC$$ temperature, what will this thermometer read (in degrees)?
  • $$78$$
  • $$66$$
  • $$62$$
  • $$58$$
State whether the following statements are True or False.
Liquids expand on heating.
  • True
  • False
During an experiment an ideal gas is found to obey an additional law $$V{p}^{2}=$$ constant. The gas is initially at temperature $$T$$ and volume $$V$$, when it expands to volume $$2V$$, the resulting temperature is $$T_2$$:
  • $$\cfrac { T }{ 2 } $$
  • $$2T$$
  • $$\sqrt { 2 } T $$
  • $$\cfrac { T }{ \sqrt { 2 } } $$
The temperature of the water of a pond is $${0}^{o}C$$ while that of the surrounding atmosphere is $$-{20}^{o}C$$. If the density of ice is $$\rho$$, coefficient of thermal conductivity is $$k$$ and latent heat of melting is $$L$$ then the thickness $$Z$$ of ice layer formed increases as a function of time $$t$$ as :
  • $${Z}^{2}=\cfrac{60k}{\rho L}t$$
  • $$Z=\sqrt { \cfrac { 40k }{ \rho L } t } $$
  • $${Z}^{2}=\cfrac { 40k }{ \rho L } \sqrt { t } $$
  • $${Z}^{2}=\cfrac{40k}{\rho L}t$$
Lake water never completely freezes because
  • Principle of conduction prevents it
  • Principle of convection prevents it
  • both of the above
  • none of the above
In experiment of heat transfer by convection, water inside the pipe completely gets heated (with the application of heat source). This can be explained best by which of the following statements,
  • Differences in densities produced between the bottom and the top of water , in turn produce the driving force which continuously circulates the water.
  • A continuous conductive channel is produced between the different layers of water in the pipe which circulates the heat.
  • both the above explains correctly
  • all of the above
Two identical containers P and Q with frictionless piston contain the same ideal gas at the same temperature and the same volume. The mass of gas in P is $$m_1$$ and that in Q is $$m_2$$. The gas in each cylinder is now allowed to expand isothermally to the same final volume $$1.5$$V. The changes pressure in P and Q are found to be $$\Delta$$p and $$2\Delta$$p respectively then.
  • $$\displaystyle m_2=2m_1$$
  • $$\displaystyle m_1 =2m_2$$
  • $$\displaystyle m_1=\frac{m_2}{4}$$
  • $$\displaystyle m_1m_2=1$$
Two conductors of the same material have their diameters in the ratio $$1:2$$ and their lengths in the ratio $$2:1$$. If the temperature difference between their ends is the same, then the ratio of amounts of heat conducted per second through them will be.
  • $$4:1$$
  • $$1:4$$
  • $$8:1$$
  • $$1:8$$
The thermal conductivity of a material in CGS system is 0.In steady state the rate of flow of heat $$10 \,cal/s-cm^2$$, then the thermal gradient will be
  • $$15^o C/cm$$
  • $$25^o C/cm$$
  • $$50^o C/cm$$
  • $$75^o C/cm$$
Two metal rods, rod-1 and rod-2 of equal length are welded together end to end.Under steady state conditions, when the free end of the end of the rod-1 is kept at $$100^0C$$  and the free end of the rod -2 is kept at $$0^0C$$ , the temperature at the welded junction is approximately.
[Thermal conductivity of rod-1 = $$92  J s^{-1}m^{-1}K^{-1}$$, and rod-2 =$$16 J s^{-1}m^{-1}K^{-1}$$]
  • $$85^0C$$
  • $$50^0C$$
  • $$75^0C$$
  • $$95^0C$$
A body of specific heat $$0.2$$ kcal$$/kg^o$$C is heated through $$100^o$$C. The percentage increase in its mass is?
  • $$9\%$$
  • $$9.3\times 10^{-11}\%$$
  • $$10\%$$
  • None of these
_____ surface absorbs more heat that any other surface under identical conditions.
  • White
  • Rough
  • Black
  • Yellow
An ideal gas follows a process described by $$PV^2=C$$ from $$(P_1, V_1, T_1)$$ to $$(P_2, V_2, T_2)$$ (C is a constant). Then.
  • If $$P_1 > P_2$$ then $$T_2 > T_1$$
  • If $$V_2 > V_1$$ then $$T_2 < T_1$$
  • If $$V_2 > V_1$$ then $$T_2 > T_1$$
  • If $$P_1 > P_2$$ then $$V_2 > V_2$$
'Thermos Flask' was invented by
  • Dewar
  • daimler
  • Urey
  • None of these
The temperature (T) of one mole of an ideal gas varies with its volume (V) as $$T = -\alpha { V }^{ 3 }+\ \beta { V }^{ 2 }$$, where $$\alpha$$ and $$\beta$$ are positive constants. The maximum pressure of gas during this process is
  • $$\dfrac { \alpha \beta }{ 2R } $$
  • $$\dfrac { { \beta }^{ 2 }R }{ 4\alpha }$$
  • $$\dfrac { (\alpha +\beta )R }{ { 2\beta }^{ 2 } }$$
  • $$\dfrac { { \alpha }^{ 2 }R }{ { 2\beta } }$$
A building at a temperature T(in k) is heated by an ideal heat pump which uses the amosphere at $$T_0(k)$$. What is the equilibrium temperature of the building ? 
  • $$T_o+\dfrac{W}{2\alpha}+ \sqrt{T_0\dfrac{W}{\alpha}+(\dfrac{W}{2\alpha})^2}$$
  • $$T_0-\dfrac{W}{2\alpha}_\sqrt{T_0\dfrac{W}{2\alpha}+(\dfrac{W}{2\alpha})^2}$$
  • $$T_o+\dfrac{W}{2\alpha}- \sqrt{T_0\dfrac{W}{\alpha}+(\dfrac{W}{2\alpha})^2}$$
  • $$T_0-\dfrac{W}{2\alpha}_\sqrt{T_0\dfrac{W}{2\alpha}+(\dfrac{W}{\alpha})^2}$$
The radii of two spheres made of same metal are $$r$$ and $$2r$$. These are heated to the same temperature and placed in the same surrounding. The ratio of rates of decrease of their temperature will be:
  • $$1 : 1$$
  • $$4 : 1$$
  • $$1 : 4$$
  • $$2 : 1$$
Vijay performed an experiment to compare the heat conductivity of four different materials P, Q, R and S. Thumbtacks were fixed with wax on each material and then the materials were fixed to a trough containing hot water as shown in the diagram. Vijay tabulated his results as shown here.
MaterialTime taken for thumbtacks to drop(minutes)
P$$5$$
Q$$6$$
R$$2$$
S$$4$$
What can be inferred from his experiment?

802735_f5fe05ab1a1e418788398860b7a25c75.jpg
  • Material R is a better conductor of heat than material S.
  • Material S is a better conductor of heat than material R.
  • Material Q is a better conductor of heat than material P.
  • Materials P, Q, R and S are equally good conductors of heat.
Thermal radiation can be detected by.
  • A thermometer
  • A radiometer
  • A bolometer
  • All of the above
Which one of the following statements is not true regarding thermal radiations?
  • All bodies emit thermal radiation at all temperatures
  • They are electromagnetic in nature
  • They travel in straight line with a velocity of $$3\times 10^8$$ m/s in free space
  • They cannot be reflected by mirrors
A cube, a thin circular plate, and a sphere are made of the same metal and having the same mass and same volume. They are initially heated to the same temperature. When left in air at the room temperature, which of these bodies will cool fastest and slowest respectively?
  • The cube; the sphere
  • The circular plate; the cube
  • The circular plate; the sphere
  • The sphere; the circular plate
If the pressure and the volume of certain quantity of ideal gas are halved, then its temperature
  • Is doubled
  • Becomes one-fourth
  • Remains constant.
  • Become four times
Two identical glass bulbs are interconnected by a thin glass tube at $$0^{\circ}C$$. A gas is filled at N.T.P. in these bulb is placed in ice and another bulb is placed in hot bath, then the pressure of the gas becomes $$1.5\ times$$. The temperature of hot bath will be
865956_5658c3edd3f248a29852cfa67c6da7f3.png
  • $$100^{\circ}$$
  • $$182^{\circ}C$$
  • $$256^{\circ}C$$
  • $$546^{\circ}C$$
When a thermometer is taken from the melting ice to a warm liquid, the mercury level rises to $$ \\ \\ \left(\dfrac { 2}{ 5 }\right)^{ th } $$ of the distance between the lower and the upper fixed points. The temperature of liquid in K is
  • $$217.15$$
  • $$313.15$$
  • $$220$$
  • $$330$$
A cubical box of side $$0.20\ m$$ is constructed from $$0.012\ m$$ thick concrete panels of thermal conductivity $$K = 0.8\ W\ m^{-1} K^{-1}$$. A $$100\ W$$ heater is sealed inside the box and switched on. The temperature of air outside the box is $$20^{\circ}C$$. After a long period of time, the air temperature inside the box will be close to
  • $$20^{\circ}C$$
  • $$22^{\circ}C$$
  • $$24^{\circ}C$$
  • $$26^{\circ}C$$
Heat from the sun is received by the earth through
  • Radiation
  • Convection
  • Conduction
  • None of the above
two bars of same length and same cross-sectional area but of different thermal conductivities $$ { K }_{ 1 } $$ and $$ { K }_{ 2 } $$ are joined end to end as shown in the figure. One end of the compound bar is at temperature $$ { T }_{ 1 } $$ and the opposite end at temperature $$ { t }_{ 2 } $$ (where $$ { T }_{ 1 }>{ T }_{ 2 } $$). the temperature of the junction is 
942008_730ce5d21a3d4773accbb44536838b3a.png
  • $$ \dfrac { { K }_{ 1 }{ T }_{ 1 }+{ K }_{ 2 }{ T }_{ 2 } }{ { K }_{ 1 }+{ K }_{ 2 } } $$
  • $$ \dfrac { { K }_{ 1 }{ T }_{ 2 }+{ K }_{ 2 }{ T }_{ 1 } }{ { K }_{ 1 }+{ K }_{ 2 } } $$
  • $$ \dfrac { { K }_{ 1 }\left( { T }_{ 1 }+{ T }_{ 2 } \right) }{ { K }_{ 2 } } $$
  • $$ \dfrac { { K }_{ 2 }\left( { T }_{ 1 }+{ T }_{ 2 } \right) }{ { K }_{ 1 } } $$
One Kg of a diatomic gas is at a pressure of $$8\times 10^4$$N/ $$m^{2}$$. The density of the gas is $$4$$kg/ $$m^{3}$$. The energy of the gas due to its thermal motion will be
  • $$3\times 10^4$$J
  • $$5\times 10^4$$J
  • $$6\times 10^4$$J
  • $$7\times 10^4$$J
Select the correct option given below:
Which of the following graphs correctly shows variation of coefficient of volume expansion of copper as a function of temperature?
One end of a $$0.25m$$ long metal bar is in steam and the other is in contact with ice .If $$12g$$ of ice melts per minute, then the thermal conductivity of the metal is (Given cross section of the bar$$=5\times 10^{-4}m^{2}$$ and latent heat of ice is $$80\,cal \,g^{-1}$$)
  • $$20\,cal\,s^{-1}\,m^{-1}\,^oC^{-1}$$
  • $$10\,cal\,s^{-1}\,m^{-1}\,^oC^{-1}$$
  • $$40\,cal\,s^{-1}\,m^{-1}\,^oC^{-1}$$
  • $$30\,cal\,s^{-1}\,m^{-1}\,^oC^{-1}$$
Which one of the following is not an assumption of kinetic theory of gases?
  • The volume occupied by the molecules of the gas is negligible
  • The force of attraction between the molecules is negligible
  • The collision between the molecules are elastic
  • All molecules have same speed
A wall is made of equally thick layers A and B of different materials. Thermal conductivity of A is twice that that of B . In the steady state, the temperature difference across the wall is $$36^o C$$. The temperature difference across the layers A is:
  • $$12^oC$$
  • $$18^oC$$
  • $$6^oC$$
  • $$24^oC$$
Two blocks with heat capacities $$ { C }_{ 1 } $$ and $$ { C }_{ 2 } $$ are connected by a rod of length l, cross-sectional are A and heat conductivity K. Initial temperature difference between the two blocks is $$ { T }_{ 0 } $$. Assuming the entire system to be isolated from surroundings, heat capacity of the rod to be negligible. The temperature difference between the blocks as a function of time is. 
  • $$ { T }_{ 0 }exp\left( \frac { -KA\left( { C }_{ 1 }+{ C }_{ 2 } \right) t }{ { C }_{ 1 }{ C }_{ 2 } } \right) $$
  • $$ { T }_{ 0 }exp\left( \frac { -KA\left( { C }_{ 1 }+{ C }_{ 2 } \right) }{ { C }_{ 1 }{ C }_{ 2 } } \right) $$
  • $$ { T }_{ 0 }exp\left( \frac { KA\left( { C }_{ 1 }+{ C }_{ 2 } \right) t }{ { C }_{ 1 }{ C }_{ 2 } } \right) $$
  • $${ T }_{ 0 }exp\left( \frac { -KA\left( { C }_{ 1 }+{ C }_{ 2 } \right) { t }^{ 2 } }{ { C }_{ 1 }{ C }_{ 2 } } \right) $$
A vessel contains a mixture consisting of $${m}_{1}=7kg$$ of nitrogen $$\left( { M }_{ 1 }=28 \right) $$ and $${m}_{2}=11g$$ of carbon dioixide $$\left( { M }_{ 2 }=44 \right) $$ at temeprature $$T=300K$$ and pressure $${ P }_{ 0 }=1\quad atm$$. The density of the mixture is:
  • $$1.446g$$ per litres
  • $$2.567g$$ per litre
  • $$3.752g$$ per litre
  • $$4.572g$$ per litre
Select the correct option given below:
In order that the heat flows from one part of solid to another part,what is required. ?
  • uniform density
  • temperature gradient
  • density gradient
  • uniform temperature
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