K K Sharma Solutions for Chapter: Thermal Properties of Matter, Exercise 1: TOPICWISE QUESTIONS

The amount of radiations emitted per second by unit area of a hollow container at ${10}^3 \mathrm{K}$ will be ....... ,$\sigma (\mathrm{Stefan}\text{'}\mathrm{s} \mathrm{constant})=5.67 \times {10}^{-8}$ SI units

If the temperature of a lamp is about $600 \mathrm{K}$, then the wavelength at which maximum emission takes place will be (Wien's constant $$$b=3\times {10}^{-3} \mathrm{m}‐\mathrm{K}$)

The rate of cooling of a sphere of thermal capacity $1000 \mathrm{Cal} {\mathrm{K}}^{-1}$ is $400$ $\mathrm{J} {\mathrm{s}}^{-1}$. Rate of fall of it's temperature is:

A solid black sphere of radius $R$ and a solid black cylinder of the same material, same radius and with height equal to the radius of the sphere, are at the same temperature. These are allowed to cool in the same surroundings. The ratio of the rate of fall of their temperature will be,

Two identical calorimeters of negligible heat capacities are filled with two liquids $\mathrm{A}$ and $\mathrm{B}$ whose densities are in the ratio $4:3$. The ratio of times taken in cooling from $80{ }^{\mathrm{o}}\mathrm{C}$ to ${\text{75 }}^{\mathrm{o}}\mathrm{C}$ is $5:6$. The ratio of their specific heats is

A blackened metal foil receives heat from a heated sphere placed at a distance $r$ from it. It is found that the foil receives power $P$. If the temperature and the distance of the sphere are doubled, then, the power received by the foil will be,

The temperature of a room is $30 °\mathrm{C}$. A body kept in it, takes $4 \min$ for cooling from $61 °\mathrm{C}$ to $59 °\mathrm{C}$. The time taken by the body in cooling from $51 °\mathrm{C}$ to $49 °\mathrm{C}$ will be:

A calorimeter of water equivalent $5\times {10}^{-3}\hspace{0.17em}\mathrm{kg}$ having $25\times {10}^{-3}\hspace{0.17em}\mathrm{kg}$ of water takes $3$ minutes to cool from $28 °\mathrm{C}$ to $21 °\mathrm{C}$. When it is filled with $30\times {10}^{-3}\hspace{0.17em}\mathrm{kg}$ of tarpin oil, it takes $2$ minutes to cool from $28 °\mathrm{C}$ to $21 °\mathrm{C}$. Specific heat of tarpin oil will be?