NEET 2020 Phase 1 | Heat and Thermodynamics Question 18 | Physics

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NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

The mean free path for a gas, with molecular diameter d and number density n can be expressed as :

$${1 \over {\sqrt 2 n\pi {d^2}}}$$

$${1 \over {\sqrt 2 {n^2}\pi {d^2}}}$$

$${1 \over {\sqrt 2 {n^2}{\pi ^2}{d^2}}}$$

$${1 \over {\sqrt 2 n\pi d}}$$

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

A cylinder contains hydrogen gas at pressure 249 kPa and temperature 27$$^\circ $$C
Its density is : (R = 8.3 J mol^-1 K^-1)

0.2 kg/m³

0.1 kg/m³

0.02 kg/m³

0.5 kg/m³

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

The quantities of heat required to raise the temperature of two solid copper spheres of radii r₁ and r₂ (r₁ = 1.5r₂) through 1 K are in the ratio :

$${9 \over 4}$$

$${3 \over 2}$$

$${5 \over 3}$$

$${27 \over 8}$$

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire systems is thermally insulated. The stop cock is suddenly opened. The Process is :

adiabatic

isochoric

isobaric

isothermal

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