Thermal Properties of Matter

A cup of coffee cools from $90°C$ to $80°C$ in t minutes when the room temperature is $20°C$. The time taken by the similar cup of coffee to cool from $80°C$ to $60°C$ at the same room temperature is :

Given below are two statements:
Statement I: The hot water flows faster than cold water
Statement II: Soap water has higher surface tension as compared to fresh water.
In the light of above statements, choose the correct answer from the options given below

[JEE Main 2025, 23 Jan (Shift 1)]

The temperature of a body in air falls from $40°C$ to $24°C$ in 4 minutes. The temperature of the air is $16°C$. The temperature of the body in the next 4 minutes will be :

Two spherical bodies of same materials having radiii 0.2 m and 0.8 m are placed in same atmosphere. The temperature of the smaller body is 800 K and temperature of the bigger body is 400 K . If the energy radiated from the smaller body is E, the energy radiated from the bigger body is (assume, effect of the surrounding temperature to be negligible),

[JEE Main 2025, 22 Jan (Shift 1)]

Water is used as a coolant in a nuclear reactor because of its:

Given below are two statements:
Statement I: The hot water flows faster than cold water
Statement II: Soap water has higher surface tension as compared to fresh water.
In the light of above statements, choose the correct answer from the options given below

[JEE Main 2025, 23 Jan (Shift 1)]

A cup of coffee take a time ' t' to cool from \(90^{\circ} \mathrm{C}\) to \(80^{\circ} \mathrm{C}\) in a surrounding of \(20^{\circ} \mathrm{C}\). If a similar cup of coffee is cooled from \(80^{\circ} \mathrm{C}\) to \(60^{\circ} \mathrm{C}\) in the same surrounding, it takes a time

(Shift - II Memory Based)

Given below are two statements:
Statement I: The hot water flows faster than cold water
Statement II: Soap water has higher surface tension as compared to fresh water.
In the light of above statements, choose the correct answer from the options given below

[JEE Main 2025, 23 Jan (Shift 1)]

A bullet at $300 \, \text{K}$ hits a wooden block. The melting point is $600 \, \text{K}$, and the total work done is 625 J. If the specific heat capacity is $0.442 \, \text{J/g} \cdot ^{\circ}\text{C}$ and the latent heat is $247 \, \text{J/g}$, find the mass of the bullet.(shift 1 Memory based)

A cup of coffee take a time ' t' to cool from \(90^{\circ} \mathrm{C}\) to \(80^{\circ} \mathrm{C}\) in a surrounding of \(20^{\circ} \mathrm{C}\). If a similar cup of coffee is cooled from \(80^{\circ} \mathrm{C}\) to \(60^{\circ} \mathrm{C}\) in the same surrounding, it takes a time

(Shift - II Memory Based)

Temperature of a body reduces from \(40^{\circ}\) to \(24^{\circ} \mathrm{C}\) in 4 minutes in surrounding of \(16^{\circ} \mathrm{C}\). What is the temperature of body after further 4 minutes?

(Shift - II Memory based)

Two spherical bodies of same materials having radiii 0.2 m and 0.8 m are placed in same atmosphere. The temperature of the smaller body is 800 K and temperature of the bigger body is 400 K . If the energy radiated from the smaller body is E, the energy radiated from the bigger body is (assume, effect of the surrounding temperature to be negligible),

[JEE Main 2025, 22 Jan (Shift 1)]

Given below are two statements:
Statement I: The hot water flows faster than cold water
Statement II: Soap water has higher surface tension as compared to fresh water.
In the light of above statements, choose the correct answer from the options given below

[JEE Main 2025, 23 Jan (Shift 1)]

An amount of ice of mass ${10}^{-3} \mathrm{kg}$ and temperature $-10°\mathrm{C}$ is transformed to vapour of temperature $110°\mathrm{C}$ by applying heat. The total amount of work required for this conversion is,
(Take, specific heat of ice $=2100{\mathrm{Jkg}}^{-1}{ \mathrm{K}}^{-1}$, specific heat of water $=4180{\mathrm{Jkg}}^{-1}{ \mathrm{K}}^{-1}$, specific heat of steam $=1920{\mathrm{Jkg}}^{-1}{ \mathrm{K}}^{-1}$, Latent heat of ice $=3.35\times {10}^5{\mathrm{Jkg}}^{-1}$ and Latent heat of steam $=2.25\times {10}^6$ ${\mathrm{Jkg}}^{-1}$ )

[JEE Main 2025, 22 Jan (Shift 1)]

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

Two spherical black bodies of radii $0.8 \, \text{m}$ and $0.2 \, \text{m}$ are at temperatures of $400 \, \text{K}$ and $800 \, \text{K}$, respectively. Find the ratio of the rate of heat loss from the two bodies.

(Shift I Memory based)

What amount of heat is required to convert $1 \, \text{gm}$ of ice at $-10^\circ \text{C}$ into steam at $110^\circ \text{C}$?

(Shift I Memory Based)