Explore topic-wise InterviewSolutions in Class 11.

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Class 11 knowledge and support exam preparation. Choose a topic below to get started.

1.

A room at `20^@C` is heated by a heater of resistence 20 ohm connected to 200 VV mains. The temperature is uniform throughout the room and the heati s transmitted through a glass window of area `1m^2` and thickness 0.2 cm. Calculate the temperature outside. Thermal conductivity of glass is `0.2 cal//mC^@` s and mechanical equivalent of heat is `4.2 J//cal`.

Answer» Correct Answer - `15.2^(@)C`<br>
Discussion
2.

The radiant emittance of a black bodyt is `R=250kW//m^(2)`. At what wavelength will the emmisivity of this black body be maximum? `(b=2.9xx10^(-3)m.K` and `sigma=5.67xx10^(-8)Wm^(-2)K^(-4)`)

Answer» Correct Answer - `2.0xx10^(-6)m`<br>
Discussion