Thermal properties of matter practice · Mixed difficulty

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

The correct value of ${0^0}C$ on the Kelvin scale is

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

Can we boil water inside the earth satellite by convection

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

During an experiment, an ideal gas is found to obey a condition $\frac{P^2}{\rho}=$ constan $t$, ( $\rho=$ density of the gas). The gas is initially at temperature T, pressure $\mathrm{P}$ and density $\rho$. The gas expands such that density changes to $\rho / 2$. Then,

Three slabs of thicknesses $\text{x}_1, \text{x}_2$ and $\text{x}_3$ and coefficients of thermal conductivity $\mathrm{K}_1, \mathrm{K}_2$ and $\mathrm{K}_3$ are placed parallel to each other in contact. In steady state the combination behaves as a single slab of material of conductivity $\mathrm{K},$ given by: (Cross section areas are same)

A steel bar 0.5 cm square [cross-sectional area] and 25 cm long at $30^\circ C$ fits into the space between two fixed supports. If the bar is now heated to $230^\circ C$, the force it exerts against the supports is $\left[ {{\alpha _{\mathrm{steel}}} = 11 \times {{10}^{ - 6}}/^\circ C\,\,\mathrm{and}\,\,{Y_{\mathrm{steel}}} = 12 \times {{10}^{11}}\frac{N}{{{m^2}}}} \right]$

Two balloons are filled, one with pure He gas and the other by air, respectively. If the pressure and temperature of these balloons are same, then the number of molecules per unit volume is

Assertion (A): With increase in temperature, the pressure of given gas increase.
Reason (R): Increase in temperature causes decrease in number of collisions of molecules with the walls of the container.

During the melting of a slab of ice at $273 \mathrm{~K}$ at atmospheric pressure

A black body is at a temperature 300 K. It emits energy at a rate, which is proportional to

The two ends of a rod of length $L$ and a uniform cross-sectional area $A$ are kept at two temperatures $T_1$ and $T_2$ $\left(T_1 > T_2\right)$. The rate of heat transfer, $\frac{d Q}{d t}$ through the rod in a steady state is given by: