Thermal properties of matter practice · Mixed difficulty

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

A device used to measure temperature is

There is a black spot on a body. If the body is heated and carried in dark room then it glows more. This can be explained on the basis of

For one mole of an ideal gas which of the following relation is correct?

Which body among these is least warm
$T_A=40^{\circ} \mathrm{C}, T_B=40 \mathrm{~K}, T_C=40^{\circ} \mathrm{F}, T_D=80^{\circ} \mathrm{F}$

A students performs cooling experiment with a solid sphere and hollow sphere of same material and size which are heated to the same temperature. If the temperature difference between each sphere and surroundings is around $30^{\circ} \mathrm{C}$, then -

When p calories of heat is given to a body, it absorbs $q$ calories; then the absorbtion power of body will be :-

A cane is taken out from a refrigerator at ${0^0}C$. The atmospheric temperature is ${25^0}C$. If ${t_1}$ is the time taken to heat from ${0^0}C$ to ${5^0}C$ and ${t_2}$ is the time taken from ${10^0}C$ to ${15^0}C$, then

Mark the incorrect statements:

If a cylinder a diameter $1.0\,\,cm$ at ${30^0}C$ is to be fitted into a hole of diameter $0.9997\,\,cm$ in a steel plate at the same temperature, then minimum required rise in the temperature of the plate is : (Coefficient of linear expansion of steel $= 12 \times {10^{ - 6}}{/^0}C)$)

It is known that wax contracts on solidification. If molten wax is taken in a large vessel and it is allowed to cool slowly, then

At $0^{\circ} \mathrm{C}$, the densities of a cork and a liquid in which the cork floats are $\mathrm{d}_1$ and $\mathrm{d}_2$ respectively. The coefficients of expansion for the material of the cork and the liquid are $\gamma$ and $100 \gamma$ respectively. If the cork sinks when temperature of liquid is $\mathrm{t}^{\circ} \mathrm{C}$, then ratio $\left(\mathrm{d_2 / d}_1\right)$ is

When a metal ring having some gap is heated
a) Length of gap increases
b) Radius of the ring decreases
c) The angle subtended by the gap at the centre remains same
d) Length of gap decreases

A body takes 5 minutes to cool down from $50^{\circ}$ to $40^{\circ} \mathrm{C}$ in surrounding of temperature $20^{\circ}$ C. Then the time taken by the same body to cool down from $40^{\circ} \mathrm{C}$ to $30^{\circ} \mathrm{C}$ in a surrounding of temperature $10^{\circ} \mathrm{C}$ is (Assuming Newton's law of cooling is valid)

Colour of shining bright star is an indication of its

The temperature of a body falls from $40^{\circ} \mathrm{C}$ to $36^{\circ} \mathrm{C}$ in 5 minutes when placed in a surrounding of constant temperature $16^{\circ} \mathrm{C}$. Find the time taken for the temperature of the body to become $32^{\circ} \mathrm{C}$.

When the door of a refrigerator is kept open then the room temperature

In a mercury thermometer the ice point (lower fixed point) is marked as ${10^0}$ and the steam point (upper fixed point) is marked as ${130^0}$. At ${40^0}C$ temperature, what will this thermometer read

The rate of cooling at 600 K, if surrounding temperature is 300 K is $R$. The rate of cooling at 900 K is

Assertion: A temperature change which increases the length of a steel rod by $1 \%$ will increase its volume by $3 \%.$
Reason: The coefficient 1 volume expansion is nearly three times the coefficient of linear expansion.

A black body at ${227^0}C$ radiates heat at the rate of $7\,\,Cal/c{m^2}s$ . At a temperature of ${727^0}C$ , the rate of heat radiated in the same units will be

A bucket full of hot water is kept in a room and it cools from $75^\circ \,C$ to $70^\circ \,C$ in ${T_1}$ minutes, from $70^\circ \,C$ to $65^\circ \,C$ in ${T_2}$ minutes and from $65^\circ \,C$ to $60^\circ \,C$ in ${T_3}$ minutes. Then

Assertion: It is hotter over the top of a fire than at the same distance on the sides.
Reason: In the upward direction, the heat propagates through convection.

Stem corrections' in Platinum resistance thermometers are eliminated by the use of

Which is the following is more close to a black body?

The property of water which is a boon to aquatic animals and plants is:

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

For one gram mol of a gas, the value of R in the equation $PV = RT$ is nearly

A sample of ${O_2}$ gas and a sample of ${H_2}$ gas both have the same mass, the same volume and the same pressure. Assuming to be perfect gases, the ratio of the temperature of ${O_2}$ gas to the temperature of the ${H_2}$ gas is

When vapour condenses into liquid