# XI_PHYSICS_HEAT AND THERMODYNAMICS_4 Online Test

Alcohol thermometer is better than the mercury thermometer because
Being lighter than mercury, the errors due to internal pressure are much smaller.
Alcohol requires much less heat to raise its temperature through 1oC.
Expansion of alcohol being smooth and regular leads to accuracy in temperature measurenment.
All of the above
Gas is superior to liquids in application to thermometry because
Expansion of gases (about 20 times) is far greater than liquids (including mercury)
Expansion of gases is regular both at low and high temperatures.
Due to much lower thermal capacity gases are far more sensitive to small changes of temperature.
All of the above
For a perfect monoatomic gas, the value of chemical constant (i) is given by (where, M = Molecular weight of substance)
I= 1.5 log10 M-1.59
I= 1.5 log10 M-5
I= 1.5 log10 M-1.59
I= 1.5 log10 M
There is no degree of freedom or the system is invariant when the phase of the system co-exist.
Two
One
Three
None of the above
The path covered by a molecule between any two consecutive collisions is a straight line, and is called the
Mean free path
Free path
Straight path
Both (a) and (b)
A cylinder contains 2L of nitrogen at 20oC and 15 atm. What will be the final pressure of ideal gas if the temperature is raised to 35oC and volume is reduced to 4L?
7.8 atms
8 atms
6 atm
7.5 atm
At what temperature is the r.m.s. speed of oxygen molecules twice their r.m.s. speed at 27oC?
637oC
757oC
927oC
1047oC
According to Maxwell’s law of equipartition of energy, the value of  for monatomic, diatomic and triatomic gases are respectively,
1.33, 1.40 and 1.67
1.67, 1.40 and 1.33
1.40, 1.33 and 1.67
1.40, 1.67 and 1.33
What will be the minimum rate at which energy must be supplied to the heat pump, discharging heat inside a house, when the outside temperature is –10oC and the interior is to be kept at 22oC? (It is necessary to deliver heat at the rate of 16 k W to make up for normal heat losses.)
1.7 kW
16 kW
15 kW
2.7 kW
What will be the work done by the refrigerator if the refrigerator has coefficient of performance = 4 and extracts heat from cold chamber at a rate of 252J per cycle?
-63 J
+63 J
-53 J
+53 J
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This test is based on AIEEE and IIT JEE syllabus.

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