NCERT Solutions for Chapter: Heat, Exercise 1: Exercise

Which figure shows the correct way of reading the temperature on a thermometer?

Which process causes the air above the hot tea to get heated?

Double-layered paper cups keep coffee hot for a longer time than single layered cups.

Will the double-layered cups also keep ice cream shakes cold for a longer time? Explain your answer.

A new thermometer calibrated as $X °U$ to $(X + 100) °U$, then find the reading on this scale which is equal to $300 K$ temperature on the absolute scale.

Name the physical quantity used to measure the following things. Also, convert the units of measurement.

Convert $38 °\mathrm{C}$ into Fahrenheit.

Ramu took four identical iron balls of temperatures $6°\mathrm{C}, 10°\mathrm{C}, 20°\mathrm{C}$ and $32°\mathrm{C}$. He kept them in physical (thermal) contact with one another. After some time, he measured the equilibrium temperature attained by these four balls. What is the value of the equilibrium temperature?

A new temperature scale with the unit ${}^{\circ }\mathrm{W}$ is invented taking ${37}^{\circ }\mathrm{C}$ as the lower fixed point $\left(0^{\circ }\mathrm{W}\right)$ and $\left({100}^{\circ } \mathrm{C}\right)$ as the upper fixed point. The interval is divided into $63$ parts. What would the melting point of ice$\left(0^{\circ } \mathrm{C}\right)$ be on the new scale?

Keshav observed that the increase in the temperature of a body is given by $T_1 = 2t^2$ for the first $5$ minutes and $T_2=3t$for the next $5$ minutes, where $T_1, T_2$ and '$t$' are temperatures in Fahrenheit, Celsius scales and time in minutes, respectively. If the initial temperature of the body is $20°\mathrm{F}$ and the relation between the Celsius and Fahrenheit scale is, then find the temperature of the body  after $8$minutes in Celsius scale.