Q JEE MAIN 2026

Rods $x$ and $y$ of equal dimensions but of different materials are joined as shown in figure. Temperatures of end...

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Q JEE-MAIN 2019

A cylinder of radius $R$ is surrounded by a cylindrical shell of inner radius $R$ and outer radius $2 R$....

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Q JEE MAIN 2020

Three rods of identical cross-section and lengths are made of three different materials of thermal conductivity $\mathrm{K}_1, \mathrm{~K}_2$ and $\mathrm{K}_3$,...

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Q JEE Main 2019

A heat source at $T=10^3 K$ is connected to another heat reservoir at $T=10^2 K$ by a copper slab which...

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Q JEE MAIN 2019

Two materials having coefficients of thermal conductivity ' 3 K ' and ' K ' and thickness ' d '...

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Q JEE MAIN 2021

https://competishun.com/ht_jee-main-31-08-2021_s1/

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Q JEE MAIN 2021

Two thin metallic spherical shells of radii $r_1$ and $r_2\left(r_1

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Q JEE MAIN 2019

Two identical beakers A and B contain equal volumes of two different liquids at $60^{\circ} \mathrm{C}$ each and left to...

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Q JEE MAIN 2021

In 5 minutes, a body cools from 75ºC to 65ºC at room temperature of 25ºC. The temperature of body at...

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Q JEE MAIN 2021

A body takes 4 min . to cool from $61^{\circ} \mathrm{C}$ to $59^{\circ} \mathrm{C}$. If the temperature of the surroundings...

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Q JEE-MAIN 2021

The electric field intensity produced by the radiation coming from a 100 W bulb at a distance of 3 m...

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Q JEE Main 2019

Temperature difference of $120^{\circ} \mathrm{C}$ is maintained between two ends of a uniform rod AB of length 2 L ....

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Q JEE MAIN 2021

What will be the average value of energy along one degree of freedom for an ideal gas in thermal equilibrium...

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Q JEE MAIN 2021

A large number of water drops, each of radius r, combine to have a drop of radius R. If the...

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Q JEE MAIN 2021

Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R....

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Q JEE MAIN 2022

Nearly 10% of the power of a 110 W light bulb is converted to visible radiation. The change in average...

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Q JEE MAIN

An ice cube of dimensions $60 \mathrm{~cm} \times 50 \mathrm{~cm} \times 20 \mathrm{~cm}$ is placed in an insulation box of...

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Q JEE MAIN 2022

Two metallic wires of identical dimensions are connected is series. If $\sigma_1$ and $\sigma_2$ are the conductivities of the these...

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Q JEE MAIN 2022

Read the following statements; A. When small temperature difference between a liquid and its surrounding is doubled the rate of...

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Q JEE MAIN 2022

If $K_1$ and $K_2$ are the thermal conductivities $L_1$ and $L_2$ are the lengths and $A_1$ and $A_2$ are the...

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Q JEE MAIN 2022

In an experment ot verify Newton's law of cooling, a graph is plotted between, the temperature difference ( $\Delta T$...

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Q JEE_MAIN 2022

As per the given figure, two plates $A$ and $B$ of thermal conductivity $K$ and $2 K$ are joined together...

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Q JEE MAIN 2022

Two coils require 20 minutes and 60 minutes respectively to produce same amount of heat energy when connected separately to...

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Q JEE MAIN 2022

An expression for a dimensionless quantity P is given by $P=\frac{\alpha}{\beta} \log _e\left(\frac{k t}{\beta x}\right)$ ; where $\alpha$ and $\beta$...

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Q JEE MAIN 2023

A body cools in 7 minutes from 60°C to 40°C. The temperature of the surrounding is 10°C. The temperature of...

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Q JEE MAIN 2025

Two cylindrical rods $A$ and $B$ made of different materials, are joined in a straight line. The ratios of lengths,...

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Q JEE MAIN 2023

Two plates A and B have thermal conductivities $84 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ and $126 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ respectively. They have same surface...

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Q JEE MAIN_2023

The resistance of a wire is 5$\Omega$ . It’s new resistance in ohm if stretched to 5 times of it’s...

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Q JEE MAIN 203

A body cools from $80^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ in 5 minutes. The temperature of the surrounding is $20^{\circ} \mathrm{C}$....

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Q JEE MAIN_2023

The average kinetic energy of a molecule of the gas is

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Q JEE MAIN 2023

Ratio of thermal energy released in two resistor R and 3R connected in parallel in an electric circuit is

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Q JEE MAINS 2024

Two conductors have the same resistances at but their temperature coefficients of resistance are and . The respective temperature coefficients...

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Q JEE MAIN 2025

A cup of coffee cools from $90^{\circ} \mathrm{C}$ to $80^{\circ} \mathrm{C}$ in $t$ minutes when the room temperature is $...

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Q JEE MAIN 2025

The difference of temperature in a material can convert heat energy into electrical energy. To harvest the heat energy, the...

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Q JEE MAIN 2025

The temperature of a body in air falls from $40^{\circ} \mathrm{C}$ to $24^{\circ} \mathrm{C}$ in 4 minutes. The temperature of...

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Q JEE MAIN 2025

A wire of length 10 cm and diameter 0.5 mm is used in a bulb. The temperature of the wire...

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Q JEE MAIN 2025

Three conductors of same length having thermal conductivity $\mathrm{k}_1, \mathrm{k}_2$ and $\mathrm{k}_3$ are connected as shown in figure. Area of...

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Q JEE MAIN 2025

Two spherical bodies of same materials having radii 0.2 m and 0.8 m are placed in same atmosphere. The temperature...

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