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Physics Exam  >  Physics Tests  >  First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Physics MCQ

First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Physics MCQ


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10 Questions MCQ Test - First Law Of Thermodynamics MCQ Level – 2 (Part - 1)

First Law Of Thermodynamics MCQ Level – 2 (Part - 1) for Physics 2024 is part of Physics preparation. The First Law Of Thermodynamics MCQ Level – 2 (Part - 1) questions and answers have been prepared according to the Physics exam syllabus.The First Law Of Thermodynamics MCQ Level – 2 (Part - 1) MCQs are made for Physics 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for First Law Of Thermodynamics MCQ Level – 2 (Part - 1) below.
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First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 1
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One mole of an ideal gas expands adiabatically from temperature T1 to temperature T2. The work done by the gas is
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Detailed Solution for First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 1

 

We have ΔU = ∫(T2 to T1) CvdT − Cv(T2−T1)
Since the process is adiabatic, dQ = 0
ΔQ = ΔU + ΔW

ΔQ = ΔU + ΔW
∴ ΔW = −ΔU

= −Cv(T2−T1)

= Cv(T1−T2)

First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 2
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The pressure-volume graph of an ideal gas cycle consisting of isothermal and adiabatic process is shown in the figure. The adiabatic process is described by

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Detailed Solution for First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 2

BC and DA represent the adiabatic expansion and the compression since we know that the adiabatic curves are more steeper than isothermal curves.
The correct answer is: AD and BC

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First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 3
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A water fall is 168m high. Assuming that half the kinetic energy of the falling water gets converted into heat, the rise in temperature of water is approximately (take g = 10m/s2)
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Detailed Solution for First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 3


⇒ 
The correct answer is: 0.2ºC

First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 4
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One gram of water on evaporation at atmospheric pressure forms 1671cm3 of steam. Heat of vaporization at this pressure is 540 cal/g. Calculate the increase in the internal energy. (Atmospheric pressure = 1×105N/m2)

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Detailed Solution for First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 4

First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 5
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A sample of gas expands from volume V1 to V2. The amount of work done by the gas in greatest when the expansion is.
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Detailed Solution for First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 5

pV curves for 3 processes are show is below. Note that the area under isobaric curve is maximum



The correct answer is: isobaric

First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 6
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One gram of water on evaporation at atmospheric pressure forms 1671cm3 of steam. Heat of vaporization at this pressure is 540 cal/g. The increase in internal energy is
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Detailed Solution for First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 6




or


∴ 
The correct answer is: 500 cal

First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 7
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Heat capacity of a substance is infinite. It means :
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First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 8
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A system changes from the state (p1, V1 ) to the state (p2, V2 ) as shown in the figure. The work done by the system is.

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Detailed Solution for First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 8


Work done = Area of graph ABD;
From above we get,
Area = 1/2 × 4 (1 × 105 + 5 × 105) = 2 × 6 × 105   = 12 × 105J

First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 9
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A body of mass 25kg is dragged on a rough horizontal road for one hour with a speed of 20km/hr.
If the coefficient of friction is 0.5 and half of the heat produced is absorbed by the body, the rise in its temperature is (specific heat of body = 0.1cal/g ºC, g = 10m/s2)
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Detailed Solution for First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 9

Distance traveled in one hour,
S = 20km

Now,⇒ 

The correct answer is: 119ºC

First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 10
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A gas, for which γ is 4/3, is heated at constant pressure. The percentage of heat supplied used for external work.
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Detailed Solution for First Law Of Thermodynamics MCQ Level – 2 (Part - 1) - Question 10



The correct answer is: 25%

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