Thermal properties of matter practice · Medium

A test tube containing water is placed in boiling water so that its mouth remains outside the boiling water. Choose the wrong statement.

A sphere, a cube and a thin circular plate are heated to the same temperature. All are made of the same material and have the equal masses. If $t_1, t_2$ and $t_3$ are the respective time taken by the sphere, cube and the circular plate in cooling down to a common temperature, then

(A): Cooking food is difficult on hills.
(R): The boiling point decreases with increases in pressure

A: Water kept in an open vessel will quickly evaporate on the surface of the moon
R: The temperature at the surface of the moon is much higher than boiling point of water

On heating a liquid of coefficient of cubical expansion $\gamma$ in a container having coefficient of linear expansion γ/3, the level of liquid in the container will

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.

Latent heat stands for:

The specific heat of water $= 4200\,\,\,\mathrm{J}\,\,\mathrm{k}{\mathrm{g}^{ - 1}}\,{\mathrm{K}^{ - 1}}$ and the latent heat of ice $= 3.4 \times {10^5}\,\,\mathrm{J}\,\,\mathrm{k}{\mathrm{g}^{ - 1}}.$ 100 g of ice at $0^\circ \mathrm{C}$ is placed in 200 g of water at $25^\circ \mathrm{C}\mathrm{.}$ The amount of ice that will melt as the temperature of water reaches $0^\circ \mathrm{C}$ is close to (in grams)

Two rods P and Q have equal lengths. Their thermal conductivities are ${K_1}$ and ${K_2}$ cross sectional areas are ${A_1}$ and ${A_2}$. When the temperature at ends of each rod are ${T_1}$ and ${T_2}$ respectively, the rate of flow of heat through P and Q will be equal, if

Assertion: Maximum air flow due to convection does not occur at the north pole but it occurs at $30^{\circ} \mathrm{N}$.
Reason: There is maximum temperature difference between equator and $30^{\circ} \mathrm{N}$.

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

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

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

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

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

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 latent heat of vaporization of a substance is always