Heat and Thermodynamics · Physics · KCET

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MCQ (Single Correct Answer)

1

Three metal rods of the same material and identical in all respects are joined as shown in the figure. The temperatures at the ends of these rods are maintained as indicated. Assuming no heat energy loss occurs through the curved surfaces of the rods, the temperature at the junction x is

KCET 2025 Physics - Heat and Thermodynamics Question 1 English
KCET 2025
2

A gas is taken from state A to state B along two different paths 1 and 2. The heat absorbed and work done by the system along these two paths are $Q_1$ and $Q_2$ and $W_1$ and $W_2$ respectively. Then

KCET 2025
3

At $27^{\circ} \mathrm{C}$ temperature, the mean kinetic energy of the atoms of an ideal gas is $\mathrm{E}_1$. If the temperature is increased to $327^{\circ} \mathrm{C}$, then the mean kinetic energy of the atoms will be

KCET 2025
4

The ratio of molar specific heats of oxygen is

KCET 2024
5

A solid cube of mass $m$ at a temperature $\theta_0$ is heated at a constant rate. It becomes liquid at temperature $\theta_1$ and vapour at temperature $\theta_2$. Let $s_1$ and $s_2$ be specific heats in its solid and liquid states respectively. If $L_f$ and $L_v$ are latent heats of fusion and vaporisation respectively, then the minimum heat energy supplied to the cube until it vaporises is

KCET 2024
6

One mole of an ideal monoatomic gas is taken round the cyclic process MNOM. The work done by the gas is

KCET 2024 Physics - Heat and Thermodynamics Question 10 English

KCET 2024
7

$$100 \mathrm{~g}$$ of ice at $$0^{\circ} \mathrm{C}$$ is mixed with $$100 \mathrm{~g}$$ of water at $$100^{\circ} \mathrm{C}$$. The final temperature of the mixture is

[Take, $$L_f=3.36 \times 10^5 \mathrm{~J} \mathrm{~kg}^{-1}$$ and $$S_w=4.2 \times 10^3 \mathrm{~J} \mathrm{~kg}^{-1} \mathrm{~K}^{-1} \text { ] }$$

KCET 2023
8

The $$p$$-$$V$$ diagram of a Carnot's engine is shown in the graph below. The engine uses 1 mole of an ideal gas as working substance. From the graph, the area enclosed by the $$p$$-$$V$$ diagram is [The heat supplied to the gas is 8000 J]

KCET 2023 Physics - Heat and Thermodynamics Question 22 English

KCET 2023
9

The speed of sound in an ideal gas at a given temperature $$T$$ is $$v$$. The rms speed of gas molecules at that temperature is $$v_{\text {rms }}$$. The ratio of the velocities $$v$$ and $$v_{\text {rms }}$$ for helium and oxygen gases are $$X$$ and $$X^{\prime}$$ respectively. Then, $$\frac{X}{X^{\prime}}$$ is equal to

KCET 2023
10

Pressure of ideal gas at constant volume is proportional to .........

KCET 2023
11

"Heat cannot be flow itself from a body at lower temperature to a body at higher temperature". This statement corresponds to

KCET 2022
12

Which of the following curves represent the variation of coefficient of volume expansion of an ideal gas at constant pressure?

KCET 2021
13

A number of Carnot engines are operated at identical cold reservoir temperatures $$(T_L)$$. However, their hot reservoir temperatures are kept different. A graph of the efficiency of the engines versus hot reservoir temperature $$(T_H)$$ is plotted. The correct graphical representation is

KCET 2021
14

A gas mixture contains monoatomic and diatomic molecules of 2 moles each. The mixture has a total internal energy of (symbols have usual meanings)

KCET 2021
15

A sphere, a cube and a thin circular plate all of same material and same mass initially heated to same high temperature are allowed to cool down under similar conditions. Then, the

KCET 2020
16

In an adiabatic expansion of an ideal gas the product of pressure and volume

KCET 2020
17

A certain amount of heat energy is supplied to a monoatomic ideal gas which expands at constant pressure. What fraction of the heat energy is converted into work?

KCET 2020
18

A thermodynamic system undergoes a cyclic process $$A B C$$ as shown in the diagram. The work done by the system per cycle is

KCET 2019 Physics - Heat and Thermodynamics Question 13 English

KCET 2019
19

One mole of $$\mathrm{O}_2$$ gas is heated at constant pressure starting at $$27^{\circ} \mathrm{C}$$. How much energy must be added to the gas as to double its volume?

KCET 2019
20
A cup of tea cools from $65.5^{\circ} \mathrm{C}$ to $62.5^{\circ} \mathrm{C}$ in 1 min in a room at $22.5^{\circ} \mathrm{C}$. How long will it take to cool from $46.5^{\circ} \mathrm{C}$ to $40.5^{\circ} \mathrm{C}$ in the same room?
KCET 2018
21
A Carnot engine takes 300 calories of heat from a source at 500 K and rejects 150 calories of heat to the sink. The temperature of the sink is
KCET 2018
22
Pressure of an ideal gas is increased by keeping temperature constant. The kinetic energy of molecules
KCET 2018
23
The S.I. unit of specific heat capacity is
KCET 2017
24
For which combination of working temperatures, the efficiency of Carnot's engine is the least?
KCET 2017
25
The mean energy of a molecule of an ideal gas is
KCET 2017
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