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NCERT Solutions for class 11 Physics | Chapter 11 - Thermal Properties of Matter

Questions
1 Three bodies are having temperature

TA = - 42 °F

TB = - 10 °C

TC = 2000 K

Which body among these is most warm

A TA
B TB
C TC
D None of these

Answer:TB
2 There are three Rods A,B,C of equal length L at same temperature .There coefficient of linear expansion are αa, αb, αr   respectively. if the temperature of all rod are increased by θ ° C and coefficient of linear expansion is like αb>αa >αc. then what will be the final order of length of rod
A Lc>Lb>Lc
B Lb= La= Lc
C La>Lb>Lc
D Lb>La>Lc

Answer:Lb>La>Lc
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3 A sphere, a cube and a thin circular plate, all of same material and same mass are initially heated to same high temperature.
A Plate will cool fastest and cube the slowest
B Sphere will cool fastest and cube the slowest
C Plate will cool fastest and sphere the slowest
D Cube will cool fastest and plate the slowest.

Answer:Plate will cool fastest and sphere the slowest
4 Refer to the plot of temperature versus time (Fig. 11.2) showing the changes in the state of ice on heating (not to scale).

Thermal properties of matter

Which of the following is correct?

A The region AB represents ice and water in thermal equilibrium.
B At B water starts boiling.
C At C all the water gets converted into steam.
D C to D represents water and steam in equilibrium at boiling point.

Answer:A, D
5 Mark the correct options:
A A system X is in thermal equilibrium with Y but not with Z. System Y and Z may be in thermal equilibrium with each other.
B A system X is in thermal equilibrium with Y but not with Z. Systems Y and Z are not in thermal equilibrium with each other.
C A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z must be in thermal equilibrium with each other.
D A system X is neither in thermal equilibrium with Y nor with Z. The system Y and Z may be in thermal equilibrium with each other.

Answer:B, D
6 A quantity of heat required to change the unit mass of a solid substance, from solid state to liquid state, while the temperature remains constant, is known as
A latent heat of fusion
B sublimation
C latent heat
D hoar frost

Answer:latent heat of fusion
7 The latent heat of vaporization of a substance is always
A greater than its latent heat of fusion
B less than its latent heat of fusion
C greater than its latent heat of sublimation
D equal to its latent heat of sublimation

Answer:greater than its latent heat of fusion
8 Three bodies A, B and C have equal area which are painted red, yellow and black respectively. If they are at same temperature, then
A emissive power of C is maximum
B emissive power of A is maximum
C emissive power of B is maximum
D emissive power of A, B and C are equal.

Answer:emissive power of C is maximum
9 Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in
A convection
B radiation
C conduction
D None of these

Answer:convection
10 Two marks on a glass rod 10 cm apart are found to increase their distance by 0.08 mm when the rod is heated from 0°C to 100°C. A flask made of the same glass as that of rod measures a volume of 1000 cc at 0°C. The volume it measures at 100°C in cc is
A 1002.4
B 1008.2
C 1004.2
D 1006.4

Answer:1002.4
11

Assertion : Water kept in an open vessel will quickly evaporate onthe surface of the moon.

Reason : The temperature at the surface of the moon is much higher than boiling point of the water.

A Assertion is correct, reason is incorrect
B None of these
C Assertion is correct, reason is correct; reason is not a correct explanation for assertion
D Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer:Assertion is correct, reason is incorrect
12 Assertion: The triple point of water is a standard fixed point in modern thermometry. Reason: The triple point of a substance is unique i.e. it occurs at one particular set of values of pressure and temperature
A Assertion is correct, reason is correct; reason is a correct explanation for assertion
B Assertion is incorrect, reason is correct
C Assertion is correct, reason is correct; reason is not a correct explanation for assertion
D None of these

Answer:Assertion is correct, reason is correct; reason is a correct explanation for assertion
13 A metal sheet with a circular hole is heated. The hole
A gets larger
B gets deformed
C gets smaller
D None of these

Answer:gets larger
14 An iron tyre is to be fitted on to a wooden wheel 1m in diameter. The diameter of tyre is 6 mm smaller than that of wheel. The tyre should be heated so that its temperature increases by a minimum of (the coefficient of cubical expansion of iron is 3.6 × 10–5/°C)
A 500°C
B 334°C
C 1000°C
D 167°C

Answer:500°C
15 The reading of Centigrade thermometer coincides with that of Fahrenheit thermometer in a liquid. The temperature of the liquid is
A 40°C
B 100°C
C 313°C
D 0ºC

Answer:40°C
16 Expansion during heating
A generally decreases the density of a material
B None of these
C increases the weight of a material
D occurs only in solids

Answer:generally decreases the density of a material
17 A solid ball of metal has a spherical cavity inside it. The balln is heated. The volume of cavity will
A increase
B decrease
C remain unchanged
D have its shape changed

Answer:increase
18 Consider the following statements and select the correct statement(s).

I. Water can never be boiled without heating.

II. Water can be boiled below room temperature by lowering the pressure.

III. On releasing the excess pressure water refreezes into ice.

A II and III
B I only
C II only
D I and II

Answer:II and III
19 Which of the following will expand the most for same rise in temperature?
A Aluminium
B Wood
C Glass
D All will expand same

Answer:Aluminium
20 Mass of water which absorbs or emits the same amount of heat as is done by the body for the same rise or fall in temperature is known as
A water equivalent of the body
B latent heat capacity of the body
C specific heat capacity of the body
D thermal capacity of the body

Answer:water equivalent of the body

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