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

A Centigrade and Fahrenheit thermometers are dipped in boiling water. The water temperature is lowered unit the Fahrenheit thermometre registers a temperature of 140o. The fall of temperature as registered by the Centigrade thermometre is :
  • 80oC
  • 40oC
  • 50oC
  • 90oC
A sample of gas expands from volume  V1  to  V2.  The amount of work done by the gas is greatest when the expansion is
  • adiabatic
  • isobaric
  • isothermal
  • Equal in all above cases
End A of a copper rod is. maintained in steam chamber and other end is maintained at 0C. Assume x=0 at A. The Tx graph for the rod in steady state is
  • None of these
Heat current is maximum in which of the following (rods are of identical dimension)
  • Copper
  • Copper steel
  • Steel Copper
  • Steel
An ideal gas is initially at Pl,V1 is expanded to P2,V2 and then compressed adiabatically to the same volume Vl and pressure P3.If  W  is the net work done by the gas in complete process which of the
  • W>0;P3>P1
  • W<0;P3>P1
  • W<0;P3
  • P2>P1;W<0
A small quantity, mass m, of water at a temperature θ in (oC) is poured on to a large mass M of ice which is at its melting point. If c is the specific heat capacity of water and L the latent heat of fusion of ice, then the mass of ice melted is given by : 
  • MLmcθ
  • mcθML
  • McθL
  • mcθL
A fixed mass of gas is taken through a process ABCA. Here AB is isobaric BC is adiabatic and CA is isothermal

The pressure at C is given by (γ=1.5)
1537783_2b96fcb3f9304823a2a43b13944ecf50.PNG
  • 10564N/m2
  • 10532N/m2
  • zero
  • 105N/m2
If Cp and Cv are molar specific heats of an ideal gas at constant pressure and volume respectively. If γ is ratio of two specific heats and R is universal gas constant then Cp is equal to?
  • Rγγ1
  • γR
  • 1+γ1γ
  • Rγ1
2 mole ideal He gas and 3 mole ideal H_2 gas at constant volume find out C_v of mixture 
  • \dfrac{21 R}{10}
  • \dfrac{11 R}{10}
  • \dfrac{21 R}{5}
  • \dfrac{11 R}{5}
What happens in the process of thermionic emission?
  • Complete molecules are emitted from the surface of a hot liquid
  • Single atoms are emitted from the surface of a hot liquid
  • Electrons are emitted from the surface of a hot metal
  • Protons are emitted from the surface of a hot metal
Two plastic cups are placed one inside the other. A small spacer keeps the two cups separated. How water is poured into the inner cup and a lid is put on top, as shown.
Which statement is correct?
1647116_be477fdc0eee44f5a9eb9cdfda1e62a9.png
  • The bench is heated by conduction from the bottom of the outer cups
  • The lid reduced the energy gain by convection
  • There is no thermal conduction through the sides of either cup
  • Thermal radiation is prevented by the small air gap
r.m.s. speed of ideal gas at 127^oC is 200m/s, the r.m.s. speed of same ideal gas at temperature 227^oC is:
  • 100\sqrt{5}
  • 200\sqrt{5}
  • 100\sqrt{15}
  • 100\sqrt{10}
Two moles of an ideal gas with \dfrac{C_P}{C_V}=\dfrac{5}{3} are mixed with 3 moles of another ideal gas with \dfrac{C_P}{C_V}=\dfrac{4}{3}. The value of \dfrac{C_P}{C_V} for the mixture is :
  • 1.47
  • 1.45
  • 1.42
  • 1.50
Pressure of an ideal gas is increased by keeping temperature constant. The kinetic energy of molecules.
  • Decreases
  • Increases
  • Remains same
  • Increases or decreases depending on the nature of gas
In which of the following phenomena do heat waves travel along a straight line with the speed of light ? 
  • Thermal conduction
  • Thermal convection
  • Thermal radiation
  • Both, thermal conduction and radiation
Water does not freeze at the bottom of the lakes in winter because :
  • ice is a good conductor of hear
  • ice reflects heat and light
  • of anomalous expansion of water between 4^oC to 0^oC
  • nothing can be said
Let C_v and C_p denote the molar heat capacities of an ideal gas at constant volume and constant pressure respectively.Which of the following is a universal constant?
  • \dfrac{C_p}{C_v}
  • C_p C_v
  • C_p - C_v
  • C_p + C_v
A steel scale gives correct reading at t_1 ^oC. When temperature changes to t_2 ^oC, then :
  • if t_2> t_1, reading is greater that true value
  • if t_2> t_1, reading is lesser that true value
  • the reading is always equal to true value
  • the reading is always less than true value
A physicist says "a body contains 10\ joule heat" but a physics learner says "this statement is correct only when the body is in liquid state". Mark correct option or options :
  • physicist statement is correct
  • physics learner's statement is correct
  • both statements are correct
  • both statements are wrong
A metal rod of length L and cross-sectional area A converts a large tank of water at temperature \theta_{0} and a small vessel containing mass m of water at initial temperature of \theta_{1}(< \theta_{0}). If the thermal conductivity of rod is K, then the time taken for the temperature of water in smaller vessel to become \theta_{2}(\theta_{1} < \theta_{2} < \theta_{0}) is:
(Given : Specific heat capacity of water is s and all other heat capacities are neglected).
  • T = \dfrac {ms}{KA} \log \dfrac {(\theta_{0} - \theta_{1})}{(\theta_{0} - \theta_{2})}
  • T = \dfrac {Lms}{KA}\log \left (\dfrac {\theta_{0} - \theta_{1}}{\theta_{0} - \theta_{2}}\right )
  • T = \dfrac {2mLs}{KA} \left (\log \dfrac {(\theta_{0} - \theta_{1})}{\theta_{0} - \theta_{2}}\right )
  • None of the above
The quantity \dfrac{PV}{kT} represents
  • mass of the gas
  • kinetic energy of the gas
  • number of moles of the gas
  • number of molecules in the gas
The temperature of a body is increased from 27^oC to 127^oC. The radiation emitted by it increases by a factor of : 
  • (256/81)
  • (15/9)
  • (4/3)
  • (12/27)
Three rods of identical cross-sectional area and made from the same material form the sides of an equilateral triangle. The point A and B are maintained at T and 2T respectively. In steady state temperature of point C is T_c. ( Assuming only heat conduction takes place.) The value of T_c is 

1738956_aeb7500b7e0c473ba5ddfb72f5a842c8.png
  • T/2
  • T
  • \dfrac{2}{3}T
  • \dfrac{3}{2}T
The net rate of heat loss by a hot body depends upon:
  • temperature of body
  • temperature of surroundings
  • material of body
  • nature of the surface
Three rods of the same cross-sectional and made of the same material from the sides of a triangle ABC as shown. The points A and B are maintained at temperature T and \sqrt 2 T respectively in the steady state. Assuming that only heat conduction takes plane, the temperature at point C is:
1738730_77328c07ee1f494796e5d3cdb357c55d.png
  • \left[\dfrac {2\sqrt 2 +\sqrt 3}{2+\sqrt 3}\right]T
  • \left[\dfrac {3 }{1+\sqrt 2}\right]T
  • \left[\dfrac {2}{\sqrt 3}\right]T
  • \left[\dfrac {\sqrt 5}{2}\right]T
Three identical rods of same material are joined to from an equilateral triangle. The temperature of end A and B is maintained constant as \sqrt {3}T and T. The ratio of T_C / T_B will be: (Assuming no loss of heat from surfaces) 
  • \dfrac {1+\sqrt 3}{2}
  • \dfrac {1+\sqrt 3}{2}
  • \dfrac {1+\sqrt 2}{2}
  • \dfrac {1-\sqrt 2}{2}
The temperature of end A of a rod us maintained at 0^oC. The temperature of end B is changing slowly such that the rod may be considered in steady state at all time and is given by T_B = \alpha T ; where \alpha is positive constant and t is time. Temperature of point C, at a distance x from end A, at any time is ____.
1738942_bbcedd571cd3476f82680987e2672811.png
  • \dfrac{\alpha xt}{L}
  • \dfrac{\alpha xt^2}{2L}
  • \dfrac{\alpha x^2t}{2L}
  • \dfrac{\alpha (L-x)}{L}t
If for hydrogen C_{p}-C_{v}=m  and for nitrogen  C_{p}-C_{v}=   n,  where  C_{p}  and  C_{v}  refer to specific heats per unit mass respectively at constant pressure and constant volume, the relation between  m  and  n  is (molecular weight of hydrogen  =2  and molecular weight of nitrogen  =14  )
  • n=14m
  • n=7m
  • m=7n
  • m=14n
An ideal gas undergoes the cyclic process shown in a graph below
1749708_4824e05c68504739b89d3f2e43ddc19a.PNG
  • T_1 = T_2
  • T_1 > T_2
  • V_aV_c = V_bV_d
  • V_aV_b = V_cV_d

An immersion heater, in an insulated vessel of negligible heat capacity, brings 100 g of water to the boiling point from 16^{0}C in 7 min. Then

         The heat of vaporization of alcohol is

  • 854 J/kg
  • 854 \times 10^{3} J/kg
  • 204 cal/g
  • 204 cal/kg
Consider two rods of same length and different specific heats (s_1 and s_2), conductivities K_1 and K_2 and areas of cross section (A_1 and A_2) and both having temperature T_1 and T_2 at their ends. If the rate of heat loss due to conduction is equal, then
  • K_1 A_1 = K_2 A_2
  • K_2 A_1 = K_1 A_2
  • \dfrac{K_1 A_1}{s_1} = \dfrac{K_2 A_2}{s_2}
  • \dfrac{K_2 A_1}{s_2} = \dfrac{K_1 A_2}{s_1}
At temperature TK, the pressure of 4.0 g argon in a bulb is P. the bulb is put in a bath having temperature higher by 50 K than the first one. 0.8 g of argon gas had to be removed to maintained original pressure .The temperature T is equal to :
  • 510 K
  • 200 K
  • 100 K
  • 73 K
Heat is added to an ideal gas and the gas expands. In such a process the temperature: 
  • must always increase
  • will remain the same if the work done equals the hear added
  • must always decrease
  • will remain the same if change in internal energy equals the heat added
Three rods of identical cross-sectional area and made from the same metal form the sides of an isosceles triangle ABC right angles at B. The points A and B are maintained at temperatures T and \sqrt{2}T, respectively, in the steady state. Assuming that only heat conduction takes place, temperature of point C
1750218_32612211ae8e42829cf63a563b5fb4dd.PNG
  • \frac {3T} {\sqrt{2} + 1}
  • \frac {T} {\sqrt{2} + 1}
  • \frac {3T} {3(\sqrt{2} - 1)}
  • \frac {T} {\sqrt{2} - 1}
Write 'true' or 'false' for each statement:        
Medium is necessary for the transfer of heat by radiation.

  • True
  • False
A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile
  • is a better conductor of heat than the wooden tile.
  • is polished while wooden tile is not polished.
  • Reflects more heat than wooden tile.
  • is a poor conductor of heat than the wooden tile.
Write 'true' or 'false' for each statement:    
On touching a lump of ice, we feel cold because some heat passes from our body to the ice.
  • True
  • False
Choose the correct alternative:
In the process of convection, heat travels
  • sideways
  • downwards
  • upwards
  • in all direction
S.I. unit of temperature is:
  • calorie
  • Joule
  • Celsius
  • Kelvin
Absolute scale of temperature is reproduced in the laboratory by making use of a
  • Radiation pyrometer
  • Platinum resistance thermometer
  • Constant volume helium gas thermometer
  • Constant pressure ideal gas thermometer
Wires A and B have identical lengths and have circular cross-sections. The radius of A is twice the radius of B i.e. r_A=2r_B. For a given temperature difference between the two ends, both wires conduct heat at the same rate. The relation between the thermal conductivities is given by :
  • K_A =4K_B
  • K_A =2K_B
  • K_A =K_B/2
  • K_A =K_B/4
The length of the two rods made up of the same metal and having the same area of the cross-section are 0.6 m and 0.8 m respectively. The temperature between the ends of the first rod is 90 ^\circ C and 60 ^\circ C and that for the other rod is 150 and 110 ^\circ C. For which rod the rate of conduction will be greater
  • First
  • Second
  • Same for both
  • None of the above
Calories is the unit of
  • Heat
  • Work
  • Temperature
  • Food
In cold countries, water pipes sometimes burst, because
  • Pipe contracts
  • Water expands on freezing
  • When water freezes, pressure increases
  • When water freezes, it takes heat from pipes
Absolute zero (0 K) is that temperature at which
  • Matter ceases to exist
  • Ice melts and water freezes
  • Volume and pressure of a gas becomes zero
  • None of these
Calorimeters are made of which of the following
  • Glass
  • Metal
  • Wood
  • Either (a) or (c)
Water is cooled from 4^oC to 0^oC it:
  • Contracts
  • Expands
  • First contrast, then expands
  • First expands then contrast
The velocity of heat radiation in vacuum is 
  • Equal to that of light
  • Less than that of light
  • Greater than that of light
  • Equal to that of sound
The coefficients of thermal conductivity of copper, mercury, and glass are respectively K, K, and K such that K > K > K. If the same quantity of heat is to flow per second per unit area of each and corresponding temperature gradients are X, X, and X, then 
  • X_c=X_m=X_g
  • X_c>X_m>X_g
  • X_c < X_m < X_g
  • X_m < X_c < X_g
Four rods of identical cross-sectional area and made from the same the metal form the sides of square. The temperature of two diagonally opposite points and T and 2T respective in the steady-state. Assuming that only heat conduction takes place, what will be the temperature difference between the other two points 
  • \dfrac{\sqrt{2}+1}{2}T
  • \dfrac{2}{\sqrt{2}+1}T
  • 0
  • None of these
0:0:2


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