NEET 2018 | Heat and Thermodynamics Question 31 | Physics

At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth’s atmosphere?
(Given : Mass of oxygen molecule (m) = 2.76 × 10^–26 kg, Boltzmann’s constant k_B = 1.38 × 10^–23 J K^–1)

2.508 × 10⁴ K

8.360 × 10⁴ K

5.016 × 10⁴ K

1.254 × 10⁴ K

NEET 2017

MCQ (Single Correct Answer)

-1

A carnot engine having an efficiency of $${1 \over {10}}$$ as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

90 J

99 J

100 J

1 J

NEET 2017

MCQ (Single Correct Answer)

-1

Thermodynamic processes are indicated in the following diagram.

NEET 2017 Physics - Heat and Thermodynamics Question 83 English

Match the following

Column-1		Column-2
P.	Process I	A.	Adiabatic
Q.	Process II	B.	Isobaric
R.	Process III	C.	Isochoric
S.	Process IV	D.	Isothermal

P $$ \to $$ C, Q $$ \to $$ A, R $$ \to $$ D, S $$ \to $$ B

P $$ \to $$ C, Q $$ \to $$ D, R $$ \to $$ B, S $$ \to $$ A

P $$ \to $$ D, Q $$ \to $$ B, R $$ \to $$ A, S $$ \to $$ C

P $$ \to $$ A, Q $$ \to $$ C, R $$ \to $$ D, S $$ \to $$ B

NEET 2017

MCQ (Single Correct Answer)

-1

A gas mixture consists of 2 moles of O₂ and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

15 RT

9 RT

11 RT

4 RT

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