Thermal properties of matter practice · Mixed difficulty

An electrical heating coil was placed in a calorimeter containing $360 \mathrm{gm}$ of water at $10^{\circ} \mathrm{C}$. The coil expand energy at the rate of 90 watt. The water equivalent of the calorimeter and the coil is $\mathbf{4 0} \mathrm{gm}$. Calculate what will be the temperature of water after 10 minutes. [J = 4.2 Joules/cal.]

It is hotter for the same distance over the top of a fire than it is in the side of it, mainly because

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)

Under steady state the temperature of a body

A metal block absorbs 4500 cal of heat when heated from $30^\circ C\,\,\mathrm{to}\,\,80^\circ C$ Its thermal capacity is $\mathrm{[Cal}\,\mathrm{/^\circ C]}$

Equal masses of two liquids are filled in two similar calorimeters. The rate of cooling will

A bimetallic strip is made of aluminium and steel $\left(\alpha_{{Al}}>\alpha_{\text {st }}\right)$. On heating, the strip will

Black body 396 is

Assertion (A): V-t graph for a gas at constant pressure is a straight line passing through origin $\{$t-temp in Celsius]
Reason (R): Volume of a gas is inversely proportional to its absolute temperature at constant pressure.

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

Statement-I: Gas thermometers are more sensitive than liquid thermometers.
Statement-II: Expansion in gases is more prominent than liquids.

In heat transfer, which method is based on gravitation

The pressure $(p)$ and the density ( $\rho$ ) of given mass of a gas expressed by Boyle's law, $p=K \rho$ holds true

Statement-I: A solid on heating undergoes expansion only because of increasing the amplitude of the simple oscillators.
Statement-II: A solid on heating undergoes expansion only because of increasing the inter atomic distance.

Two spheres of the same materials have radii $1m$ and $4m$ and temperatures $4000\,K$ and $2000\,K$ respectively. The ratio of the energy radiated to that by the second by the first sphere to that by the second is

If 1 g of ice at $0^{\circ} \mathrm{C}$ is added to 5 g of water at $10^{\circ} \mathrm{C}.$ If the latent heat of ice is $80 \mathrm{~cal} / \mathrm{g},$ the final temperature of the mixture is

The thermal radiation from a hot body travels with a velocity of

The lower and upper fixed points in Reaumur scale is

The coefficient of linear expansion of crystal in one direction is $\alpha_1$ and that in every direction perpendicular to it is $\alpha_2$. The coefficient of cubical expansion is -

On centigrade scale the temperature of a body increase by 30 degrees. The increase temperature on Fahrenheit scale is

A rod of silver of length ${100^ \circ }C$ at ${0^\mathrm{o}}C$ is hearted to ${100^\mathrm{o}}C$. It’s length is increased by 0.19 cm coefficient of cubical expansion the silver rod is [in $/{\,^ \circ }C$]

If Poisson’s ratio $\sigma$ is $+ \frac{1}{2}$ for a material, then the material is

For a perfectly black body, its absorptive power is

Coefficient of volume expansion of ideal gases at constant pressure and at temperature $T \text{ K}$ is proportional to

When a rod is heated, its linear expansion depends on
a) Initial length
b) Area of cross section
c) Mass
d) Temperature rise

A black body at a temperature of ${127^0}C$ radiates heat at the rate of $1\,\,cal/c{m^2} \times \sec$. At a temperature of ${527^0}C$ the rate of heat radiation from the body in $\left( {cal/c{m^2} \times \sec } \right)$ will be

Woolen clothes are used in winter season because woolen clothes

Ratio of the amount of heat radiation, transmitted through the body to the amount of heat radiation incident on it, is known as

The freezer in a refrigerator is located at the top section so that

Saturated vapour is compressed to half is volume without any change in temperature, then the pressure will be