Pyrometer is a device for measuring

Important Questions on Thermal Properties of Matter

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

At what temperature do the Fahrenheit and Celcius scales of temperature coincide?

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

A thin paper cup filled with water does not catch fire when placed over a flame. This is because

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

Name the physical quantity which is measured in calories. How is calorie related to the SI unit of that quantity?

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

The SI unit of mechanical equivalent of heat is

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

A certain liquid has a melting point of $-50°C$ and a boiling point of $150°C$. A thermometer is designed with this liquid and its melting and boiling points are designated at $0°L$ and $100°L$. The melting and boiling points of water on this scale are
 

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

Solar energy is incident normally on the earth's surface at the rate of about $1.4\mathrm{ }\mathrm{kW}\mathrm{ }{\mathrm{m}}^{-2}$ . The distance between the earth and the sun is $1.5\times {10}^{11} \mathrm{m}$ . Energy $\left(E\right)$ and mass $\left(m\right)$ are related by the Einstein equation, $E=m{c}^2$ where $c=\left(3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}\right)$ is the speed of light in free space. The decrease in the mass of the sun is

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

Mercury is often used in clinical thermometers. Which one of the following properties of mercury is not a reason for this?

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

Ice is used in a cooler in order to cool its contents. Which of the following will speed up the cooling process?

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

A faulty thermometer has its fixed points marked 5 and 95. When this thermometer reads 68, the correct temperature in Celsius is

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

The readings of a constant volume gas thermometer at $0°\mathrm{C}$ and $100°\mathrm{C}$ are $40 \mathrm{cm}$ of mercury and $60 \mathrm{cm}$ of mercury. If its reading at an unknown temperature is $100 \mathrm{cm}$ of the mercury column, then the temperature is

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

The temperature, at which Centigrade and Fahrenheit scales give the same reading is

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

On a hilly region, water boils at $95$ $°$$C$.The temperature expressed in Fahrenheit is

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

The temperature at which the centigrade thermometer and the kelvin thermometer gives the same reading, is 

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

The Fahrenheit and Kelvin scales of temperature will give the same reading at

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

On a hilly region, water boils at $95 °\mathrm{C}$. The temperature expressed in Fahrenheit scale is

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

The temperature of the cold junction of thermocouple is $0 °\mathrm{C}$ and the temperature of hot junction is $T °\mathrm{C}.$ The emf is $E=16T-0.04T^2 \mathrm{\mu V}$. The inversion temperature $T_i$ is

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

A bullet of mass $5 \mathrm{g}$ moving at a speed of $200 \mathrm{m} {\mathrm{s}}^{-1}$ strikes a rigidly fixed wooden plank of thickness $0.2 \mathrm{m}$ normally and passes through it losing half of its kinetic energy. If it again strikes an identical rigidly fixed wooden plank and passes through it, assuming the same resistance in the two planks, the ratio of the thermal energies produced in the two planks is

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

One junction of a certain thermoelectric couple is at a fixed temperature $T_{\mathit{r}}$, and the other junction is at temperature $\mathit{\text{T}}$. The thermo-electromotive force for this is expressed by$\mathit{\text{E}}=\mathit{\text{K}}\left(\mathit{\text{T}}-{\mathit{\text{T}}}_{\mathit{\text{r}}}\right)\left[{\mathit{\text{T}}}_0-\frac{1}{2}(\mathit{\text{T}}+{\mathit{\text{T}}}_{\mathit{\text{r}}}\text{)}\right]$. At temperature $\mathit{\text{T}}=\frac{1}{2}{\mathit{\text{T}}}_0$, the thermoelectric power is, 

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

One junction of a thermocouple is at a particular temperature $T_r$ and another is at $T$. Its thermo EMF is expressed as $E=k\left(T-T_r\right)\{T_0-\frac{1}{2}\left(T+T_r\right)\}.$
At temperature $T=\frac{T_0}{2}$, the value of thermo electric power will be,

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Measurement of Temperature

One calorie is nearly equal to