# XI_PHYSICS_HEAT AND THERMODYNAMICS_6 Online Test

According to Dulong petit’s law, the average molar heat capacities for all metals except the very lightest are approximately the same and equal to about
25 J.mol-1(oC)-1
30 J.mol-1(oC)-1
20 J.mol-1(oC)-1
35 J.mol-1(oC)-1
The maximum possible efficiency of an engine having two heat reservoirs can be calculated by
Carnot cycle
First law of thermodynamics
Zeroth law of thermodynamics
Planck’s law
The temperature of the surface of the sun is 6500oC. The same on Rankine and Kelvin scale respectively will be:
12000, 6600
12192, 6773
12200, 6800
None of the above
At what temperature do the Kelvin and the Fahrenheit scales coincide?
574.25
560
40
None of the above
According to Planck’s formula for maximum energy of emission,  will be
0
1
5
According to Andrew’s result, every substance has a
Critical temperature
Critical point
Critical Constant
All of the above
The triple point pressure of water is 4.60 mm. What is the corresponding triple point temperature, if the saturation vapour pressures (S.V.P.) for water at 0oC be 4.5762 mm and at 1oC be 4.9162 mm?
0.0030oC
0.0070oC
0.0123oC
0.0156oC
If the triple point temperature of water be 0.0070oC and the S.V.P. of water at 0oC =460 mm, with 0.34 mm its rate of increase per 1oC rise in temperature, what is the lowering of the melting point of ice per 1 atmosphere increase of pressure?
0.0069oC
0.0123oC
0.0072oC
0.0143oC
If 210 kJ heat is supplied to ice of mass m=720 g at –10oC, then what are the final state at 0oC temperature of the water?
580 g water, 140 g ice
500 g water, 220 g ice
475 g water, 245 g ice
450 g water, 270 g ice
Critical temperature of a gas is the temperature below which a gas can be liquefied by
The application of temperature alone
The application of pressure alone
Decreasing the mass of gas
Both (a) and (b)
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