A body cools from 50°C to 40°C in 5 minutes. The surrounding temperature is 20°C. In the next 5 minutes, it will cool approximately to:

A lead bullet of 10 g travelling at $300\,m/s$ strikes against a block of wood and comes to rest. Assuming $50\%$ of heat is absorbed by the bullet, the increase in its temperature is (specific heat of lead $= 150J/kg,K)$

An electric immersion heater of 1.08 kW is immersed in water. After the water has reached a temperature of ${100^0}C$, how much time will be required to produce 100 g of steam

A bimetallic strip, made of materials with different coefficients of thermal expansion, bends when heated. This bending is primarily due to:

Two objects are in thermal equilibrium. Which of the following statements is true?

Two identical isolated containers A and B contain ideal gases with the same number of moles. Container A is at a temperature $T_A$ while container B is at a temperature $T_B = 2T_A$. A third identical container C is evacuated and brought into thermal contact with A and then with B. If the final temperature of C is $T_C$, which of the following relations is correct?

Which of the following properties is NOT used as a thermometric property?

Which of the following temperature scales has an absolute zero where all molecular motion theoretically ceases?

In a water-fall the water falls from a height of 100m. If the entire K.E. of water is converted into heat, the rise in temperature of water will be

Two different metallic rods of the same length have their ends kept at the same temperatures $heta_1$ and $heta_2$ with $heta_2 > heta_1$. If $A_1$ and $A_2$ are their cross-sectional areas, $K_1$ and $K_2$ their thermal conductivities, the rate of heat flow is the same in both the rods. The condition for this is:

A metallic sphere with a radius of $r$ and emissivity $e$ is heated to a temperature $T$. If the absolute temperature of the surroundings is $T_0$, which of the following expressions correctly represents the net rate of heat loss by radiation from the sphere?