- Concept of Heat and Temperature
- |
- Zeroth Law of Thermodynamics
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- Measurement of temperature
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- Ideal Gas Equation and Absolute Temperature
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- Thermal Expansion
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- Thermal stress
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- Specific Heat Capacity
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- Calorimetry
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- Change of phases
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- Solved Examples

A circular hole of diameter 2.00 cm is made in an aluminium plate at 0

Linear expansion for aluminium = 2.3 * 10

Diameter of circular hole in aluminium plate at 0

With increase in temperature from 0

using

L=L

where L0=2.0 cm

α = 2.3 * 10

ΔT=(100 -0)=100

we can find diameter at 100

L=2(1+2.3*10

=2.46 cm

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

Given that

Pressure at the ice point P

Pressure at the steam point P

Pressure at the wax bath P

T=(P

T = (100 - 80)X100/(90-80)

= 20X100/10

=200

A rod of length L having coefficent of Linear expansion a is lying freely on the floor.it is heated so that temperature changes by b .Find the longitidunal strain developed in the rod

a. 0

b. ab

c. -ab

d. none of the above

There was no restriction for it expansion.So no tensile or compressive force developed.Longitudinal strains happens only when tensile or compressive force developed in the rod.So answer is a

.if a is coefficent of Linear expansion,b coefficent of areal expansion,c coefficent of Volume expansion.Which of the following is true

a. b=2a

b. c=3a

c. b=3a

d. a=2b

Answer is c

.which is of them is not used as the measurable properties in thermometer?

a.Resistance of platinum wire

b.Constant volume of gas

c.Contant pressure of gas

d.None of the above

Answer is d

.when a solid metalic sphere is heated.the largest percentage increase occurs in its

a.Diameter

b. Surface area

c. Volume

d. density

Answer is c

.the density of the liquid depends upon

a. Nature of the liquid

b. Temperature of the liquid

c. Volume of the liquid

d. Mass of the liquid

Answer is a and b

A metallic sphere has a cavity of diameter D at its center.If the sphere is heated,the diameter of the . cavity will

a. Decrease

b. Increase

c. Remain unchanged

d. none of the above

Answer is b

.A metallic circular disc having a circular hole at its center rotates about it axis passing through the center and perpendicular to it plane.when the disc is heated

a. Its speed will decrease

b. Diameter will increase

c. Moment of inertia will increase

d. its speed will increase

(a),(c)

Due to thermal expansion,the diameter of the disc as well of the hole will increase.therefore the moment of inertia will increase resulting in a increase in the angular speed.

A resistance thermometer is such that resistance varies with temperature as

R

where T represent Temperature on Celsius scale And a,b,R

Based on above data ,Find out the unit of a,b

As per dimension analysis Unit on both sides should be equal

Now since R & R

Quantity 1+aT+bT

so at should be dimension less

so a unit is C

similarly bT

so b unit is C

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