NEET (UG)

Practice Test 1 — Thermal Properties of Matter & Thermodynamics

12 questions • 18 minutes • auto-graded with full solutions

⏱ 18:00

0 / 12 answered

[object Object]

0 / 12

0Correct

0Wrong

0Skipped

0:00Time used

Back to Study

Section A — MCQ (Single Correct)

Question 1

The coefficient of volume expansion is related to linear expansion by:

Solution: $\gamma = 3\alpha$ for an isotropic solid.

Question 2

Heat required to raise the temperature of mass $m$ by $\Delta T$ is:

Solution: $Q = mc\,\Delta T$.

Question 3

During melting at constant temperature, the heat supplied is the latent heat of:

Solution: Solid to liquid uses the latent heat of fusion.

Question 4

Thermal conduction rate through a slab is proportional to:

Solution: $Q/t = kA\,\Delta T/L$.

Question 5

A black body at $300\ \text{K}$ and another at $600\ \text{K}$ radiate power in the ratio:

Solution: $E \propto T^4$; $(600/300)^4 = 16$.

Question 6

In an isothermal process for an ideal gas:

Solution: Constant $T$ means $\Delta U = 0$.

Question 7

For an adiabatic process, $PV^{\gamma} = $ constant, where $\gamma$ equals:

Solution: $\gamma = C_P/C_V$.

Question 8

A Carnot engine between $400\ \text{K}$ and $300\ \text{K}$ has efficiency:

Solution: $\eta = 1 - 300/400 = 0.25 = 25\%$.

Section B — Assertion & Reason

Question 9

A: Water can be made to boil without heating by reducing the pressure on it.
R: The boiling point of a liquid falls as the external pressure decreases.

Solution: Lower pressure lowers the boiling point, so reduced pressure can make water boil at room temperature — R explains A.

Question 10

A: A gas cools when it expands adiabatically.
R: In an adiabatic expansion the gas does work at the expense of its internal energy.

Solution: With $\Delta Q = 0$, work done by the gas reduces $U$ and hence $T$ — R explains A.

Question 11

A: A heat engine can convert all the heat it absorbs into useful work.
R: The efficiency of a Carnot engine is $1 - T_2/T_1$.

Solution: A is false (the second law forbids full conversion); R is a true statement of Carnot efficiency.

Question 12

A: Steam at $100^{\circ}\text{C}$ produces more severe burns than water at $100^{\circ}\text{C}$.
R: Steam releases its latent heat of vaporisation when it condenses on the skin.

Solution: The extra latent heat released on condensation makes steam burns worse — R explains A.