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


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10 Questions MCQ Test Topic wise Tests for IIT JAM Physics - First Law Of Thermodynamics MCQ Level – 2 (Part - 1)

First Law Of Thermodynamics MCQ Level – 2 (Part - 1) for Physics 2024 is part of Topic wise Tests for IIT JAM 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.
Solutions of First Law Of Thermodynamics MCQ Level – 2 (Part - 1) questions in English are available as part of our Topic wise Tests for IIT JAM Physics for Physics & First Law Of Thermodynamics MCQ Level – 2 (Part - 1) solutions in Hindi for Topic wise Tests for IIT JAM Physics course. Download more important topics, notes, lectures and mock test series for Physics Exam by signing up for free. Attempt First Law Of Thermodynamics MCQ Level – 2 (Part - 1) | 10 questions in 45 minutes | Mock test for Physics preparation | Free important questions MCQ to study Topic wise Tests for IIT JAM Physics for Physics Exam | Download free PDF with solutions
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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