Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.

A heated body emits radiation which has maximum intensity near the wavelength `lamda_(0)`. The emissivity of its material is 0.75. the absolute temperature of the body is doubledA. The maximum intensity of radiation will be near wavelength `2lamda_(0)`B. The maximum intensity of radiation will be near wavelength `lamda_(0)//2`C. The total energy emitted will increase 16 timesD. the total energy emitted will increase 12 times

Answer» Correct Answer - B::C
Discussion
2.

A rof of length `l` with thermally insulated lateral surface consists of material whose heat conductivity coefficient varies with temperature as `x = alpha//T`, where `alpha` is a constant. The ends of the rod are kept at temperatures `T_1` and `T_2`. Find the function `T (x)`, where `x` is the distance from the end whose temperature is `T_1`, and the heat flow density.

Answer» `T=T_(1)((T_(2))/(T_(1)))^(x//L)`
Discussion
3.

Two identical conducting rods are first connected independently to two vessels, one containing water at `100^(@)C` and the other containing ice at `0^(@)C`. In the second case, the rods are joined end to end connected to the same vessels. Let `m_(1) and m_(2)` g/s be the rate of melting of ice in the two cases respectively, the ratio `(m_(1))/(m_(2))` isA. `1:2`B. `2:1`C. `4:1`D. `1:4`

Answer» Correct Answer - C
Discussion
4.

A long rod has one end at `0^@C` and other end at a high temperature. The coefficient of thermal conductivity varies with distance from the low temperature end as `K = K_0(1+ax)`, where `K_0 = 10^2` SI unit and `a = 1m^-1` . At what distance from the first end the temperature will be `100^@C`? The area of cross-section is `1cm^2` and rate of heat conduction is 1 W.

Answer» Correct Answer - 1.71 m
Discussion