List of top Physics Questions on Heat Transfer asked in MHT CET

A composite slab consists of two materials having coefficients of thermal conductivity $K$ and $2K$, thickness $x$ and $4x$ respectively. The temperatures of two outer surfaces of a composite slab are $\text{T}_2$ and $\text{T}_1$ respectively ($\text{T}_2 > \text{T}_1$). The rate of heat transfer through the slab in a steady state is $\left[ \frac{A(\text{T}_2-\text{T}_1)K}{x} \right] f$, where $f$ is equal to}

If $120\text{ J}$ of thermal energy is incident on area $3\text{ m}^2$, the amount of heat transmitted is $12\text{ J}$ , coefficient of absorption is $0.6$ , then the amount of heat reflected is

A composite slab consists of two materials having coefficients of thermal conductivity $K$ and $2K$, thickness $x$ and $4x$ respectively. The temperatures of two outer surfaces of a composite slab are $\text{T}_2$ and $\text{T}_1$ respectively ($\text{T}_2 > \text{T}_1$). The rate of heat transfer through the slab in a steady state is $\left[ \frac{A(\text{T}_2-\text{T}_1)K}{x} \right] f$, where $f$ is equal to}

Sphere of color black, red, white, and yellow are heated to the same temperature. The decreasing order of cooling is:

The temperature of a black body is increased by 50%, then the percentage increase in the rate of radiation by the body is approximated as

For a perfectly black body, coefficient of emission is

A cylindrical rod has temperatures '$T_1$' and '$T_2$' at its ends. The rate of flow of heat is '$Q_1$' $\text{cal s}^{-1}$. If length and radius of the rod are doubled keeping temperature constant, then the rate of flow of heat '$Q_2$' will be

The temperature difference between two sides of an iron plate, $1.8\text{ cm}$ thick is $9^\circ\text{C}$. Heat is transmitted through the plate $10\text{ kcal/s}\cdot\text{m}^2$ at steady state. The thermal conductivity of iron is

The temperature difference between two sides of metal plate, 3 cm thick is 15°C. Heat is transmitted through plate at the rate of 900 kcal per minute per m² at steady state. The thermal conductivity of metal is

Two rods of same length and material are joined end to end. They transfer heat in 8 second. When they are joined in parallel they transfer same amount of heat in same conditions in time

A conducting rod of length $1\ \text{m}$ has area of cross-section $10^{-3}\ \text{m}^2$. One end is immersed in boiling water ($100^\circ\text{C}$) and the other end in ice ($0^\circ\text{C}$). If coefficient of thermal conductivity of copper is $92\ \text{cal}/\text{m-s-}^\circ\text{C}$ and latent heat of ice is $8 \times 10^4\ \text{cal}/\text{kg}$, then the amount of ice which will melt in one minute is

A black rectangular surface of area $A$ emits energy $E$ per second at $27^\circ \text{C}$. If length and breadth are reduced to one third of initial value and temperature is raised to $327^\circ \text{C}$, then energy emitted per second becomes

The temperature difference between two sides of metal plate, 3 cm thick is 15°C. Heat is transmitted through plate at the rate of 900 kcal per minute per m² at steady state. The thermal conductivity of metal is