Thermal properties of matter practice · Medium

A body cools down from $50^{\circ} \mathrm{C}$ to $45^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$ and $45^{\circ} \mathrm{C}$ to $40^{\circ} \mathrm{C}$ is $8 \mathrm{~min}$. Find the temperature of the surrounding. Assume Newton's law of cooling is valid.

Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at ${100^\mathrm{o}}C$, while the other one is at ${\mathrm{0}^\mathrm{o}}C$, If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is

If the temperature of radiating body increased by $50 \%$. The percentage increase in radiation energy is closest to

Statement-I: Invar steel is used to prepare clock pendulum.
Statement-II: The coefficient of linear expansion of invar steel is infinity.

The coefficient of cubical expansion of water is negative between

A pendulum clock having copper rod keeps correct time at $20^{\circ} \mathrm{C}$. It gains 15 seconds per day if cooled to $0^{\circ} \mathrm{C}$. The coefficient of linear expansion of copper is

A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will

The coefficient of volume expansion of an ideal gas at constant pressure and at temperature $T$. K is equal to

An iron sphere has a radius of $10 \mathrm{~cm}$ at a temperature of $0^{\circ} \mathrm{C}$. Calculate the change in the volume of the sphere, if it is heated to $100^{\circ} \mathrm{C}$. Coefficient of linear expansion of iron $=11 \times 10^{-6}{ }^{\circ} \mathrm{C}^{-1}$.

A faulty thermometer reads the melting point and boiling point of water as $-1^{\circ} \mathrm{C}$ and $104^{\circ} \mathrm{C}$ respectively. The temperature of the object is measured as $40^{\circ} \mathrm{C}$ using that thermometer. The true temperature of the object is:

The gas thermometers are more sensitive than liquid thermometers because

Which of the following statements is wrong

The pressure of air in the bulb of a constant volume gas thermometer at $0^{\circ} \mathrm{C}$ and $100^{\circ} \mathrm{C}$ are $73.00 \mathrm{~cm}$ and $100 \mathrm{~cm}$ of mercury respectively. Calculate the pressure at the room temperature $20^{\circ} \mathrm{C}$.

For an ideal gas at absolute temperature T, the coefficient of volume expansion at constant pressure is

On an $\mathrm{X}$ temperature scale, water freezes at $-125.0^{\circ} \mathrm{X}$ and boils at $375.0^{\circ} \mathrm{X}$. on a $\mathrm{Y}$ temperature scale, water freezes at $-70.0^{\circ} \mathrm{Y}$ and boils at $-30.0^{\circ} \mathrm{Y}$. The value of temperature on $\mathrm{X}$-scale equal to the temperature of $50.0^{\circ} \mathrm{Y}$ on $\mathrm{Y}$-scale is:

Assertion (A): Invar is used in metal tapes, balance wheels and pendulum clocks
Reason (R): The coefficient of linear expansion of invar is very low

Thermoelectric thermometer is based on

When red glass is heated in dark room it will seen

The ratio of the lengths of two rods is 4:3 the ratio of their coefficients of cubical expansion is 2:3 then the ratio of their linear expansions when they are heated through same temperature different is

Air is a bad conductor of heat or partly conducts heat, still, the vaccum is to be placed between the walls of the thermos flask because

Amount of heat required to raise the temperature of a body through 1K is called its

A piece of ice of mass $100 \mathrm{~g}$ and at temperature $0^{\circ} \mathrm{C}$ is put in $200 \mathrm{~g}$ of water at $25^{\circ} \mathrm{C}$. How much ice will melt as the temperature of water reaches $0^{\circ} \mathrm{C}$ ?

(Take, latent heat of fusion of ice $=3.4 \times 10^5 \mathrm{Jkg}^{-1}$ )

A $\;litre$ of alcohol weighs

If the initial temperatures of metallic sphere and disc, of the same mass, radius and nature are equal, then the ratio of their rate of cooling in same environment will be

An aluminium plate of 100 cm length and 20 cm breadth at 273 K. The area is increased by $2 \mathrm{~cm}^2$ at $100^{\circ} \mathrm{C}$ the coefficient of linear expansion of plate is:

Which one of the following processes depends on gravity

Find the water equivalent of copper block of mass $100 \mathrm{grams}$. The specific heat of copper is $0.09 \mathrm{cal} / \mathrm{g}^{\circ} \mathrm{C}$

Assertion: Food is cooked with difficulty at mountain peak.
Reason: Water boils at high temperature there.

Which of the following is the correct device for the detection of thermal radiation

Two straight metallic strips each of thickness $t$ and length $\ell$ are rivetted together. Their coefficients of linear expansions are $\alpha_1$ and $\alpha_2$. If they are heated through temperature $\Delta T$, the bimetallic strip will bend to form an arc of radius