Heat and Temperature Physics - Heat and Temperature

A metal sheet with a circular hole is heated. The hole:

1. Gets larger.
2. Gets smaller.
3. Remains of the same size.
4. Gets deformed.

A body A is placed on a railway platform and an identical body B in a moving train. Which of the following energies of B are greater than those of A, as seen from the ground?

1. Kinetic.
2. Total.
3. Mechanical.
4. Internal.

A steel wire of cross-sectional area 0.5mm² is held between two fixed supports. If the wire is just taut at 20^°C, determine the tension when the temperature falls to 0^°C. Coefficient of linear expansion of steel is 1.2 × 10^-5 °C^-1 and its Young's modulus is 2.0 × 10¹¹N m^-2.

The pressures of the gas in a constant volume gas thermometer are 80cm, 90cm and 100cm of mercury at the ice point, the steam point and in a heated wax bath, respectively. Find the temperature of the wax bath.

It is heard sometime that mercury is used in defining the temperature scale because it expands uniformly with temperature. If the temperature scale is not yet defined, is it logical to say that a substance expands uniformly with temperature?

If two bodies are in thermal equilibrium in one frame, will they be in thermal equilibrium in all frames?

In a Callender's compensated constant pressure air thermometer, the volume of the bulb is 1800 cc. When the bulb is kept immersed in a vessel, 200 cc of mercury has to be poured out. Calculate the temperature of the vessel.

Does the temperature of a body depend on the frame from which it is observed?

In defining the ideal gas temperature scale, it is assumed that the pressure of the gas at constant volume is proportional to the temperature T. How can we verify whether this is true or not? Are we using the kinetic theory of gases? Are we using the experimental result that the pressure is proportional to temperature?

The length of a brass rod is found to be smaller less on a hot summer day than on a cold winter day as measured by the same aluminium scale. Do we conclude that brass shrinks on heating?

The density of water at 0^°C is 0.998g cm^-3 and at 4^°C is 1000g cm^-3.Calculate the average coefficient of volume expansion of water in the temperature range 0 to 4^°C.

Why do marine animals live deep inside a lake when the surface of the lake freezes?

If an automobile engine is overheated, it is cooled by putting water on it. It is advised that the water should be put slowly with engine running. Explain the reason.

A glass window is to be fit in an aluminium frame. The temperature on the working day is 40^°C and the glass window measures exactly 20cm × 30cm. What should be the size of the aluminium frame so that there is no stress on the glass in winter even if the temperature drops to 0^°C ? Coefficients of linear expansion for glass and aluminium are 9.0 × 10^-6 °C^-1 and 24 × 10^-6 °C^-1 respectively.

A glass vessel measures exactly 10cm × 10cm × 10cm at 0^°C. It is filled completely with mercury at this temperature. When the temperature is raised to 10^°C, 1.6cm³ of mercury overflows. Calculate the coefficient of volume expansion of mercury. Coefficient of linear expansion of glass = 6.5 × 10^-6 °C.

Can the bulb of a thermometer be made of an adiabatic wall?