In adiabatic expansion 

(1) ΔU = 0

(2) ΔU = negative

(3) ΔU = positive

(4) ΔW = zero

Subtopic:  First Law of Thermodynamics |
 72%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The pressure and density of a diatomic gas (γ=7/5) changes adiabatically from (P, d) to (P', d'). If d'd=32, then P'P should be: 

1. 1/128 2. 32
3. 128 4. None of the above
Subtopic:  Types of Processes |
 67%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

An ideal gas at 27°C is compressed adiabatically to 827 of its original volume. If γ=53, then the rise in temperature is

(1) 450 K

(2) 375 K

(3) 225 K

(4) 405 K

Subtopic:  Types of Processes |
 76%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Two identical samples of a gas are allowed to expand, (i) isothermally and (ii) adiabatically. Work done will be:

1. more in the isothermal process.
2. more in the adiabatic process.
3. equal in both processes.
4. none of the above.

Subtopic:  Work Done by a Gas |
 66%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Which is the correct statement ?

(1) For an isothermal change PV = constant

(2) In an isothermal process the change in internal energy must be equal to the work done

(3) For an adiabatic change P2P1=V2V1γ, where γ is the ratio of specific heats

(4) In an adiabatic process work done must be equal to the heat entering the system

Subtopic:  Types of Processes |
 81%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The slopes of isothermal and adiabatic curves are related as -

(1) Isothermal curve slope = adiabatic curve slope

(2) Isothermal curve slope = γ × adiabatic curve slope

(3) Adiabatic curve slope = γ × isothermal curve slope

(4) Adiabatic curve slope = 12× isothermal curve slope

Subtopic:  Types of Processes |
 75%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2 joules, the work done during the process by the gas will be equal to -

(1) 1 J

(2) –1 J

(3) 2 J

(4) – 2 J

Subtopic:  First Law of Thermodynamics |
 63%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

If γ denotes the ratio of two specific heats of a gas, the ratio of slopes of adiabatic and isothermal PV curves at their point of intersection is 

(1) 1γ

(2) γ

(3) γ-1

(4) γ+1

Subtopic:  Types of Processes |
 80%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time 

1. The pressure decreases
2. The pressure increases
3. The pressure remains the same
4. The pressure may increase or decrease depending upon the nature of the gas
Subtopic:  Types of Processes |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The adiabatic Bulk modulus of a perfect gas at pressure P is given by 

(1) P

(2) 2P

(3) P/2

(4) γ P

Subtopic:  Types of Processes |
 79%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints