Blog Log in Get Started Free

NEET Practice Questions (MCQs) with Answers & Solutions

Practice free NEET NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

Language English हिंदी

● ● ● ● ●

If the ratio of specific heat of a gas at constant pressure to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume changes from V to 2V constant pressure p, is

$R / (γ - 1)$

$p V / (γ - 1)$

$γ p V / (γ - 1)$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$Δ U = μ C_{V} Δ T = n (\frac{R}{γ - 1}) Δ T$

$\Rightarrow Δ U = \frac{P Δ V}{(γ - 1)} = \frac{P (2 V - V)}{γ - 1} = \frac{P V}{(γ - 1)}$

● ● ● ● ●

If heat given to a system is 6 kcal and work done is 6 kJ. Then the change in internal energy is :

19.1 kJ

12.5 kJ

25 kJ

Zero

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$Δ Q = Δ U + Δ W$ ⇒ $Δ U = Δ Q - Δ W$

$= 6 \times 4 .18 - 6 = 19 .08 k J$

$\approx 19 .1 k J$

● ● ● ● ●

A monoatomic gas of n-moles is heated from temperature T₁ to T₂ under two different conditions (i) at constant volume and (ii) at constant pressure. The change in internal energy of the gas is

More for (i)

More for (ii)

Same in both cases

Independent of number of moles

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Change in internal energy $Δ U = μ C_{V} Δ T$

it doesn’t depend upon type of process. Actually it is a state function

● ● ● ● ●

Can two isothermal curves cut each other

Never

Yes

They will cut when temperature is 0°C

Yes, when the pressure is critical pressure

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

If isothermal curves cut each other then at equilibrium two temperature will be there which is impossible.

● ● ● ● ●

A vessel containing 5 litres of a gas at 0.8 m pressure is connected to an evacuated vessel of volume 3 litres. The resultant pressure inside will be (assuming whole system to be isolated)

4/3 m

0.5 m

2.0 m

3/4 m

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$0 .8 \times 5 = P \times (3 + 5) \Rightarrow P = 0 .5 m$

● ● ● ● ●

For an isothermal expansion of a perfect gas, the value of $\frac{Δ P}{P}$ is equal -

$- γ^{1 / 2} \frac{Δ V}{V}$

$- \frac{Δ V}{V}$

$- γ \frac{Δ V}{V}$

$- γ^{2} \frac{Δ V}{V}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Differentiate PV = constant w.r.t V

⇒ $P Δ V + V Δ P = 0$ ⇒ $\frac{Δ P}{P} = - \frac{Δ V}{V}$

● ● ● ● ●

If a gas is heated at constant pressure, its isothermal compressibility

Remains constant

Increases linearly with temperature

Decreases linearly with temperature

Decreases inversely with temperature

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$E_{θ} = P$ , if P = constant, $E_{θ} =$ constant

● ● ● ● ●

In isothermal expansion, the pressure is determined by -

Temperature only

Compressibility only

Both temperature and compressibility

None of these

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

For such a case, pressure $= \frac{1}{Compressibility}$

● ● ● ● ●

The isothermal bulk modulus of a perfect gas at normal pressure is -

$1 .013 \times 10^{5} N / m^{2}$

$1 .013 \times 10^{6} N / m^{2}$

$1.013 \times 10^{- 11} N / m^{2}$

$1 .013 \times 10^{11} N / m^{2}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$E_{θ} = P = 1 .013 \times 10^{5} N / m^{2}$

● ● ● ● ●

In an isothermal change, an ideal gas obeys -

Boyle's law

Charle's law

Gaylussac law

None of the above

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

In isothermal process, compressibility E_θ = ρ.

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every NEET question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.