EASY

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Thermal expansion is the most in gases.

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Important Questions on Thermal Properties of Matter

MEDIUM

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

A compressive force,

F

is applied at the two ends of a long thin steel rod. It is heated, simultaneously, such that its temperature increases by

Δ T

. The net change in its length is zero. Let

l

be the length of the rod, A its area of cross-section,

Y

its Young's modulus, and

α

its coefficient of linear expansion. Then,

F

is equal to:

HARD

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

A leak proof cylinder of length

1 m,

made of a metal which has very low coefficient of expansion is floating vertically in water at

0^{o} C

such that its height above the water surface is

20 c m .

When the temperature of water is increased to

4^{o} C,

the height of the cylinder above the water surface becomes

21 c m .

The density of water at

T = 4^{o} C,

relative to the density at

T = 0^{o} C

is close to:

HARD

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

The ends Q and R of two thin wires, PQ and RS, are soldered (joined) together. Initially each of the wires has a length of

1 m

10 ° C .

Now the end P is maintained at

10 ° C,

while the end S is heated and maintained at

400 ° C .

The system is thermally insulated from its surroundings. If the thermal conductivity of wire PQ is twice that of the wire RS and the coefficient of linear thermal expansion of PQ is

1.2 \times 10^{- 5} K^{- 1},

the change in length of the wire PQ is

MEDIUM

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

A non-isotropic solid metal cube has coefficients of linear expansion as:

5 \times 10^{- 5} /^{o} C

along the x-axis and

5 \times 10^{- 6} /^{o} C

along the y and the z-axis. If the coefficient of volume expansion of the solid is

C \times 10^{- 6} /^{o} C

, then the value of

C

is _____________

EASY

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

Which quantities remain fixed in the definition of volume expansion co-efficient of a gas? Name a non-metal, which is a good conductor of heat.

MEDIUM

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

What does a bimetallic strip consist of?

MEDIUM

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

One end of a steel girder in a bridge is not fixed, but is kept on rollers. Give the reason.

EASY

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

Write the quadrants in which the following points lie:

$(- 4, 7)$

HARD

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

Soft drink bottles are not filled completely. Why?

EASY

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

State which expands more, when heated to the same temperature: solid, liquid or gas?

MEDIUM

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

Why are gaps left between successive rails on a railway track ?

MEDIUM

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.

HARD

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

Describe an experiment to show that same volume of different liquids heated to same rise in temperature expand by different amounts.

EASY

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

State one application of thermal expansion of liquids.

HARD

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

Give reasons for: Small gaps are left between successive rail tracks.

MEDIUM

Physics>Thermal Physics>Thermal Properties of Matter>Thermal Expansion

Describe an experiment to show that air expands on heating.