Thermal properties of matter practice · Mixed difficulty

As the temperature of a black body increases, the wave length of the emitted radiations of maximum intensity:

(A): Temperatures near the sea coast are moderate.
(R): Water has a high thermal conductivity.

A glass vessel contains air at ${60^0}C$. To what temperature must it be heated to expel one third of the air. The pressure remaining constant.

The wavelength of radiation emitted by a body depends upon

Thermoelectric thermometer is based on

The surface temperature of the stars is determined using

On heating one end of a rod, the temperature of whole rod will be uniform when :-

“Good emitters are good absorbers” is a statement concluded from

Two thermometers are used to record the temperature of a room. If the bulb of one is wrapped in wet hanky

Calorie is defined as the amount of heat required to raise temperature of 1 g of water by ${1^0}C$ and it is defined under which of the following conditions?

Newton's law of cooling applies when a body is losing heat to its surroundings by

On a cold morning, a metal surface will feel colder to touch than a wooden surface because

In a closed room heat transfer takes place by

Assertion: In a pressure cooker the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water starts boiling again.
Reason: The impurities in water bring down its boiling point.

Which of the following instrument is used measure temperature of the source from its thermal radiations?

Calorimeters are made of which of the following

If there are no heat losses, the heat released by the condensation of $xg$ of steam at ${100^0}C$ into water at ${100^0}C$ can be used to convert $y\,\,gm$ of ice at ${0^0}C$ into water at ${100^0}C$. Then the ratio $y:x$ is nearly

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

For cooking the food, which of the following type of utensil is most suitable

(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

The energy that will be ideally radiated by a 100 kW transmitter in 1 hour is:

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

During an experiment, an ideal gas is found to obey an additional law $V{P^2} = {\text{constant}}{\text{.}}$ The gas is initially at temperature $T$ and volume $V.$ The temperature of the gas when it expands to a volume $2V$ is

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 $30^{\circ} \mathrm{N}$.