A system is taken from state A to state B along two different paths, 1 and 2. If the heat absorbed and work done by the system along these two paths are Q1, Q2 and W1, W2 respectively, then:

1.  \(Q_1=Q_2\)
2. \(W_1=W_2\)                     
3. \(Q_1-W_1=Q_2-W_2\)
4. \(Q_1+W_1=Q_2+W_2\)


 

Subtopic:  First Law of Thermodynamics |
 81%
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The variation of density (p) of gas with its absolute temperature (T) at constant pressure is best represented by the graph

1.        2.  

3.        4.  

Subtopic:  Types of Processes |
 83%
From NCERT
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An ideal gas changes from state 'a' to state 'b' as shown in figure. What is the work done by the gas in the process?

1. zero

2. positive

3. negative

4. infinite

Subtopic:  Work Done by a Gas |
 68%
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The temperature inside a refrigerator is t2C and the room temperature is t1C . The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be -

(1)t1t1-t2     

(2) t1+273t1-t2

(3) t2+273t1-t2   

(4) t1+t2t1+273

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 61%
From NCERT
NEET - 2016
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A refrigerator works between 4°C and 30°C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is (Take, 1 cal = 4.2 Joules)

(1) 23.65W
(2) 236.5W
(3) 2365W
(4) 2.365W

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 75%
From NCERT
NEET - 2016
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The figure below shows two paths that may be taken by a gas to go from state A to state C. In process AB, \(400~\text{J}\) of heat is added to the system and in process BC, \(100~\text{J}\) of heat is added to the system. The heat absorbed by the system in the process AC will be:

        

1. \(380~\text{J}\) 2. \(500~\text{J}\)
3. \(460~\text{J}\) 4. \(300~\text{J}\)
Subtopic:  First Law of Thermodynamics |
 64%
From NCERT
NEET - 2015
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The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is -20°C, the temperature of the surroundings to which it rejects heat is  -

(1)31°C

(2)41°C

(3)11°C

(4)21°C

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 63%
From NCERT
NEET - 2015
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One mole of an ideal gas from an initial state A undergoes via two processes. It first undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3V to V at constant pressure. The correct p-V diagram representing the two processes is -

Subtopic:  Types of Processes |
 78%
From NCERT
NEET - 2012
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An ideal gas goes from state A to state B

via three different processes as indicated 

in the p-V diagram

If Q1, Q2, Q3 indicates the heat absorbed

by the gas along the three processes and 

U1, U2, U3 indicates the change in 

internal energy along the three processes

respectively, then

(a) Q1>Q2>Q3 and U1= U2= U3

(b) Q3>Q2>Q1 and U1= U2= U3

(c) Q1=Q2=Q3 and U1>U2>U3

(d) Q3>Q2>Q1 and U1>U2>U3

Subtopic:  First Law of Thermodynamics |
 79%
From NCERT
NEET - 2012
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A container of volume 1m3 is divided into two equal compartments by a partition. One of these compartments contains an ideal gas at 300 K. The other compartment is vaccum. The whole system is thermally isolated from its surroundings. The partition is removed and the gas expands to occupy the whole volume of the container. Its temperature now would be -

(1) 300 K

(2) 239 K

(3) 200 K

(4) 100 K

Subtopic:  First Law of Thermodynamics |
 81%
From NCERT
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