CBSE Questions for Class 11 Engineering Physics Thermal Properties Of Matter Quiz 1 - MCQExams.com

An ideal gas goes through a reversible cycle $$a\rightarrow b\rightarrow c\rightarrow d$$ has the V- T diagram shown below. Process $$d\rightarrow a $$ and $$b\rightarrow c$$ are adiabatic.
The corresponding P-V diagram for the process is ( all figure are schematic and not drawn to scale).
306918.png
A leak proof cylinder of length $$1m$$, made of a metal which has low coefficient of expansion is floating vertically in water at $$0^oC$$ such that its height above the water surface is $$20cm$$. When the temperature of water is increased to $$4^oC$$, the height of the cylinder above the water surface becomes $$21cm$$. The density of water at $$T = 4^oC$$, relative to the density at $$T = 0^oC$$ is close to:
  • $$1.26$$
  • $$1.03$$
  • $$1.04$$
  • $$1.01$$
Which of the following shows the correct relationship between the pressure $$'P'$$ and density $$\rho$$ of an ideal gas at constant temperature ? 
Two non-reactive monoatomic ideal gases have their atomic masses in the ratio 2:The ratio of their partial pressures, when enclosed in a vessel kept at a constant temperature, is 4:The ratio of their densities is
  • 1 : 4
  • 1 : 2
  • 6 : 9
  • 8 : 9
A given sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T. The mass of each molecule of the gas is m. which of the following gives the density of the gas?
  • mKT
  • P/(kT)
  • Pm/(kT)
  • P/(kTV)
A vessel of volume $$20\ L$$ contains a mixture of hydrogen and helium at temperature of $$27^{\circ}C$$ and pressure $$2\ atm$$. The mass of mixture is $$5\ g$$. Assuming the gases to be ideal, the ratio of mass of hydrogen to that of the helium in the given mixture will be
  • $$1 : 2$$
  • $$2 : 3$$
  • $$2 : 1$$
  • $$2 : 5$$
A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body?
  • Radiation
  • Convection
  • Conduction
  • Temperature remains unchanged
$$0.5$$ moles of an ideal gas at constant temperature $$27^{\circ}C$$ kept inside a cylinder of length $$L$$ and cross-section area $$A$$ closed by a massless piston.
The cylinder is attached with a conducting rod of length $$L$$, cross-section area $$(\dfrac{1}{9})m^{2}$$ and thermal conductivity $$k$$, whose other end is maintained at $$0^{\circ}C$$. If piston is moved such that rate of heat flow through the conducing rod is constant then velocity of piston when it is at height $$\dfrac{L}{2}$$ from the bottom of cylinder is:
[Neglect any kind of heat loss from system]
730919_bb07b1646d0c4326bce5a581e2206b3a.png
  • $$\left (\dfrac {k}{R}\right )m/sec$$
  • $$\left (\dfrac {k}{10R}\right )m/sec$$
  • $$\left (\dfrac {k}{100R}\right )m/sec$$
  • $$\left (\dfrac {k}{1000R}\right )m/sec$$

The difference between volume and pressure coefficients of an ideal gas is :


24920.PNG
  • $$\dfrac{1}{273}$$
  • $$273$$
  • $$\dfrac{2}{273}$$
  • Zero

A sealed glass jar is full of water. When it is kept in a freezing mixture, it is broken because :
  • water expands from $$4^{o}C$$ to $$0^{o}C$$
  • ice expands while melting
  • water expands due to freezing
  • ice expands since its temperature falls below $$0^{0}C$$
The gas law $$\left [ \dfrac{PV}{T} \right ]=$$ constant is true for
  • isothermal change only
  • adiabatic change only
  • both isothermal & adiabatic
  • neither isothermal nor adiabatic

List - I                                           List - II

a. Temperature of water          e.273 K

at the bottom of a lake

b.$$\gamma _{r}$$of water is - ve                    f. 277 K

between

c. $$\gamma _{r}$$ of water is positive            g. above 277 K

d. Temperature of water           h. 273K and

just below ice layer in                277 K

a Lake
  • a- g, b-h, c-e, d-f
  • a-h, b-e, c-f, d-g
  • a-e, b-f, c-g, d-h
  • a-f, b-h, c-g, d-e

Water at $$4^{0}$$C is filled to the brim of 2 beakers. A boy performed an experiment A of heating and B of cooling. The observation was :
  • water level in B went down and in A water flowed out
  • water flowed out in both the cases
  • water flowed out in B and water level went down in A
  • water level went down in both cases

The P-T graph for the given mass of an ideal gas is shown in figure. Then the volume


24918.PNG
  • increases
  • decreases
  • remains constant
  • data insufficient

A gas in an airtight container is heated from 25$$^{o}$$C to 90$$^{o}$$C. The density of gas will :


24912_3be3ef5bf04d4f9899cb7551ad4cecc0.png
  • increase slightly
  • increase considerably
  • remain the same
  • decrease slightly

A sealed glass jar is full of water. When its temperature is decreased to $$0^{o}C$$ :
  • The glass jar remains as it is with ice
  • The glass jar remains as it is with water
  • The glass jar contains half the amount of ice mixed with water
  • The glass jar breaks due to the formation of ice

The molar gas constant is the same for all gases because at the same temperature and pressure, equal volumes of gases have the same :


24890_63dab1df5b28479dacf92fc02db26c12.png
  • number of molecules
  • average potential energy
  • ratio of specific heats
  • density

If the volume of the gas is to be increased by 4 times :
  • temperature and pressure must be doubled
  • at constant P, the temperature must be increased by 4 times
  • at constant T, the pressure must be increased by 4 times
  • it cannot be increased

A gas at temperature 27$$^{0}$$C and pressure 30 atmospheres is allowed to expand to one atmospheric pressure. If the volume becomes 10 times its initial volumes, the final temperature becomes :
  • 100$$^{o}$$C
  • 373 K
  • 373$$^{o}$$C
  • -173$$^{o}$$C

The temperature of a gas contained in a closed vessel is increased by 2 K when the pressure is increased by 2%. The initial temperature of the gas is :
  • 200K
  • 100K
  • 200$$^{0}$$C
  • 100$$^{0}$$C

The Universal gas constant may be expressed as :

a) 8.31 J/mole-K         c) 2.00 J/mole-K

b) 8.31 cal/mole-K       d) 2.00 cal/mole-K
  • a,c
  • a,d
  • b,c
  • b,d

The parameter that determine the physical state of gas are :

a) Pressure                  b) Volume

c) Number of moles    d) Temperature
  • a & b
  • a,b & c
  • a,b & d
  • a,c & d

16 gm of $$O_{2}$$ gas and x gm of $$H_{2}$$ gas occupy the same volume at the same temperature and pressure. Then x is :
  • 1/2gm
  • 1gm
  • 8gm
  • 16 gm

The mass of oxygen gas (in Kilo grams) occupying a volume of 11.2 litre at a temperature 27$$^{0}$$C and a pressure of 76cm of mercury is :

(Molecular weight of oxygen = 32)
  • 0.001456
  • 0.01456
  • 0.1456
  • 1.1456

Select the correct formula :

(where k=Boltzmann's constant, R= gas constant, n= moles, r = density, M= molecular weight, p= pressure, T= kelvin temperature, V= volume)

a) k=RN$$_{av}$$

b)$$r=\dfrac{nM}{V}$$

c)$$\dfrac{p}{r}=\dfrac{RT}{M}$$

d) R=kN$$_{av}$$
  • a,b,c
  • a,b,d
  • b,c,d
  • a,c,d

In the equation PV=constant, the numerical value of constant depends upon

a) temperature                 b) mass of the gas

c) system of units used   d) nature of the gas
  • a & b
  • b & c
  • c & d
  • all

How many times is the weight of the air filling a room in winter ($$7^{0}C$$) greater than weight in summer $$(37^{0}C)$$ ? Assume that pressure is constant.
  • 1.11
  • 0.90
  • 11.1
  • 9.0

Two containers of equal volume containing the same gas at pressure $$P_{1}$$ and  $$P_{2}$$ and absolute temperature  $$T_{1}$$ and  $$T_{2}$$ respectively were connected with narrow capillary tube. The gas reaches a common pressure P and a common temperature T. The ratio P/T is equal to :
  • $$\dfrac{P_{1}}{T_{1}} +\dfrac{P_{2}}{T_{2}}$$
  • $$\dfrac{1}{2}\left ( \dfrac{P_{1}}{T_{1}} +\dfrac{P_{2}}{T_{2}}\right )$$
  • $$\dfrac{P_{1}T_{2}+P_{2}T_{1}}{T_{1}+T_{2}}$$
  • $$\dfrac{P_{1}T_{2}-P_{2}T_{1}}{T_{1}-T_{2}}$$
The fastest mode of transmission of heat is Radiation.
  • True
  • False
When a body has the same temperature as that of its surroundings :
  • It does not radiate heat
  • It radiates same quantity of heat as it receives from the surroundings
  • It radiates less quantity of heat as it receives from the surroundings
  • It radiates more quantity of heat as it receives from the surroundings.
Which of the following methods of flow of heat is (are) based on gravitational attraction?
  • Conduction
  • Convection
  • Radiation
  • All of these
In a room containing air, heat can go from one place to another by :
  • conduction
  • convection
  • radiation
  • all of these
Ventilators are provided at the top of a room:
  • To bring oxygen for breathing.
  • So that sunlight may enter the room.
  • To maintain convectional currents to keep the air fresh in the room.
  • To provide an outlet for carbon dioxide.
A) Heat transfer by conduction and convection require a material medium.
B) Heat transfer by radiation doesn't require a material medium.
  • both A and B are true
  • A is true but B is false
  • B is true but A is false
  • both A and B are false
In the following, which statement is correct :
a) A hot body emits hot radiations only.
b) A cold body absorbs the radiations only.
c) A cold body emits cold radiations only.
d) All the bodies emit and absorb radiations simultaneously.
  • a
  • b
  • c
  • d
Newton's law of cooling is applied in laboratory for the determination of the
  • Specific heat of gases
  • Latent heat of gases
  • Specific heat of liquids
  • Latent heat of liquids
Sun's heat reaches the earth by the process of:
  • Conduction
  • Convection
  • Radiation
  • Scattering
Radiation is passing through a transparent medium, then :
  • the temperature of medium increases
  • the temperature of medium decreases
  • the temperature of medium does not alter
  • the temperature of medium first increases and then becomes steady
Density of a material varies with temperature.
  • True
  • False
When the pressure of a gas is changed, then:
  • The density of the gas also changes.
  • The ratio of the pressure to the density remains unaffected.
  • The velocity of the sound remains unaffected.
  • The value of $$\gamma$$ changes.
Keeping the number of moles, volume and temperature the same, which of the following are the same for all ideal gases?
  • rms speed of molecules
  • Density
  • Pressure
  • Average magnitude of momentum
Thermal radiations are similar to
  • $$ \alpha $$ rays
  • X-rays
  • cathode rays
  • none of these
How is the velocity of thermal radiations ($$v$$) related to the velocity of light ($$c$$)?
  • $$v < c$$
  • $$v > c$$
  • $$v = c$$
  • the relation depends upon the wavelength of the radiations
A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body?
  • conduction
  • radiations
  • convection
  • the temperature of the bodies remain unchanged
The density of water at 4$$^o$$ C is
  • minimum
  • maximum
  • $$10^{3}Kg/m^{3}$$
  • $$1Kg/m^{3}$$
In which part of electromagentic spectrum do the heat radiations lie?
  • visible
  • violet
  • ultraviolet
  • infrared
The material of prism used for obtaining spectrum of heat radiations is
  • rock salt
  • quartz
  • flint glass
  • crown glass
Due to anomalous behaviour of water, for the same mass, the volume of ice is more than that of water.
  • True
  • False
When water is heated from $$0^{\circ}C$$ to $$10^{\circ}C$$, its volume:
  • increases
  • decreases
  • does not changes
  • first decreases and then increases
Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in
  • conduction
  • convection
  • radiation
  • None of these
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