Thermal properties of matter practice · Mixed difficulty

The coefficient of volumetric expansion of mercury is $18 \times {10^{ - 5}}/{^0}C$. A thermometer bulb has a volume ${10^{ - 6}}{m^3}$ and cross section of stem is $0.004c{m^2}$. Assuming that bulb is filled with mercury at ${0^0}C$ then the length of the mercury column at ${100^0}C$ is

The sleepers are used below the rails

The relative humidity on a day when partial pressure of water vapour is $0.012 \times {10^5}$ Pa at ${12^0}C$ is (Take vapour pressure of water at this temperature as $0.16 \times {10^5}$ Pa)

A cube of a substance of coefficient of cubical expansion $\gamma_1$ is floating in a liquid of coefficient of cubical expansion $\gamma_2\left(\gamma_2 < \gamma_1\right)$, such that $50 \%$ of its volume is inside the liquid. If temperature of the system is now increased, the percentage of volume of cube inside the liquid may be

By increasing the temperature of a liquid its

Let there be four articles having colours blue, red, black and white. When they are heated together and allowed to cool, which article cool at the earliest

A metal piece is heated upto ${T^0}$ abs. The temperature of the surrounding is ${t^0}$ abs. The heat in the surrounding due to radiation is proportional to

The gas thermometers are more sensitive than liquid thermometers because

Calculate the amount of heat radiated per second by a body of surface area $10 \mathrm{~cm}^2$ kept in thermal equilibrium in a room at temperature $27^{\circ} \mathrm{C}$ ? The emissivity of surface is 0.80 and $\sigma=6 \times 10^{-8} \mathrm{~W} / \mathrm{m}^2-\mathrm{k}^4$ :-

How many reference temperature/s is/are used to make the Kelvin temperature scale?

Statement-1: At a steelworks, molten iron is heated to $1500^{\circ} \mathrm{C}$ to remove impurities. It is accurate to say that molten iron contains more heat than solid iron.
Statement-2: Solid iron at melting point needs to be supplied heat corresponding to its latent heat of fusion for phase change.

Newton’s law of cooling is a special case of

The resistance of a resistance thermometer has values $2.71$ and $3.70\,\,ohm$ at ${10^0}C$ and ${100^0}C$. The temperature at which the resistance is $3.26\,\,ohm$ is

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

An aluminum measuring rod, which is correct at ${5^ \circ }C$ measures a certain distance as 88.42 m at ${35^ \circ }C$. The error in measuring the distance due to the expansion of the rod is $\left( {\alpha = 23 \times {{10}^{ - 6}}/1{\,^ \circ }C} \right)$

Of the following thermometers, the one which can be used for measuring a rapidly changing temperature is a

Read the following statements:
A. When small temperature difference between a liquid and its surrounding is doubled, the rate of loss of heat of the liquid becomes twice.
B. Two bodies $P$ and $Q$ having equal surface areas are maintained at temperature $10^{\circ} \mathrm{C}$ and $20^{\circ} \mathrm{C}$. The thermal radiation emitted in a given time by $P$ and $Q$ are in the ratio $1: 1.15$.
C. A carnot Engine working between $100 \mathrm{~K}$ and $400 \mathrm{~K}$ has an efficiency of $75 \%$.
D. When small temperature difference between a liquid and its surrounding is quadrupled, the rate of loss of heat of the liquid becomes twice.
Choose the correct answer from the options given below

Statement A: Two metallic spheres of same size, one of copper and other of aluminium heated to the same temperatures, will cool at the same rate when they are suspended in the same enclosure.
Statement B: The rate of cooling of a body is directly proportional to the excess of temperature of the body over the surroundings.

What is the cause of the 'Greenhouse effect'?

If the absolute temperature of hot black body is raised by $2 \%$, by how much percentage rate of heat energy radiated would be increased nearly?

What is the triple point of water on a Fahrenheit scale? What is the absolute zero on this scale?

Water does not freeze at the bottom of the lakes in winter because

In Boyle’s law what remains constant

In a pressure cooker, cooking is faster because the increase of vapour pressure

A piece of blue glass heated to a high temperature and a piece of red glass at room temperature, are taken inside a dimly lit room then

Maximum density of ${H_2}O$ is at the temperature

The cofficient of volume expansion of a liquid is $\boldsymbol{\gamma}$, it is filled in a container of a material having the coefficient of linear expansion $\boldsymbol{\alpha}$. If the liquid overflows on heating:

The latent heat of vaporization of a substance is always

The unit of thermal conductivity is:

The study of physical phenomenon at low temperatures (below liquid nitrogen temperature) is called