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Test: Thermal Expansion


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Test: Thermal Expansion - Question 1

Two identical rectangular strips, one of copper and the other of steel, are riveted as shown to form a bi-metal strip. On heating, the bi-metal strip will

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Detailed Solution for Test: Thermal Expansion - Question 1

On heating, the copper strip will suffer greater elongation and hence the bimetal strip will bend with the steel strip on the concave side. 

[Bimetal strips are widely used in thermal switching applications such as automatic electric iron].

Test: Thermal Expansion - Question 2

Four cylindrical rods of different radii and lengths are used to connect two heat reservoirs at fixed temperatures t1 and t2 respectively. From the following pick out the rod which will conduct the maximum quantity of heat:

Detailed Solution for Test: Thermal Expansion - Question 2

The rate of heat transfer is directly proportional to the bisectional surface area of the solid and inversely proportional to its parallel length. 
That is heat conduction rate say H ∝ r2
∝ 1/L
I.e ∝ r2/L
Hence the conduction would be
maximum in case in which  r2/L ratio is largest.

Test: Thermal Expansion - Question 3

The temperature for which the reading on Celsius and Fahrenheit scales are identical is

Detailed Solution for Test: Thermal Expansion - Question 3

The Celsius and Fahrenheit are two important temperature scales. The Fahrenheit scale is used primarily in the United States, while Celsius is used throughout the world. The two scales have different zero points and the Celsius degree is bigger than the Fahrenheit one. There is one point on the Fahrenheit and Celsius scales where the temperatures in degrees are equal. This is -40 degree C and -40 degree F.

Test: Thermal Expansion - Question 4

A steel tape is calibrated at 20° C. A piece of wood is being measured by steel tape at 10°C and reading is 30 cm on the tape. The real length of the wood is:

Detailed Solution for Test: Thermal Expansion - Question 4

When heated the length between adjacent markings increases. Hence the actual length will be less than
30 cm.

Test: Thermal Expansion - Question 5

Which phase of matter has maximum value of temperature coefficient of cubical expansion?

Detailed Solution for Test: Thermal Expansion - Question 5

Gas expands more than solid and liquid because gas particles are far apart hence freely move.

Test: Thermal Expansion - Question 6

The coefficient of liner expansion of a cubical crystal along three mutually perpendicular direction is showimage and showimage (1). What is the coefficient of cubical expansion of crystal?

Detailed Solution for Test: Thermal Expansion - Question 6

Cubical expansion means there is expansion is length (a1), breadth (a2) and height (a3). Therefore the net coefficient of cubical expansion is α1 + α2 + α3.

Test: Thermal Expansion - Question 7

Relationship for converting the Fahrenheit and Celsius scales is

Detailed Solution for Test: Thermal Expansion - Question 7

Test: Thermal Expansion - Question 8

When water is heated from 0° C to 20° C its volume:

Detailed Solution for Test: Thermal Expansion - Question 8

When water is heated from 0°C, its volume decreases because its density increases and you can see this effect upto 4°C. Since the density of ice is maximum at 4°C, afterwards as the density decreases the volume increases. The main reason for this is hydrogen bond in ice gets cleaved due to the melting of ice.

Test: Thermal Expansion - Question 9

The relation between coefficient of volume expansion 10303_image007 and coefficient of linear expansion 10303_image008 is

Detailed Solution for Test: Thermal Expansion - Question 9

This is simple because the coefficients of linear expansion αL, areal expansion αA, and volume expansion αv, are in the ratio of 1: 2: 3 i.e.:
αL: αA: αv :: 1: 2: 3
Hence, αv = 3αL

Test: Thermal Expansion - Question 10

Water contract on heating between the temperatures

Detailed Solution for Test: Thermal Expansion - Question 10

When water is heated from 0oC, its volume decreases because its density increases and you can see this effect upto 4oC. Since the density of ice is maximum at 4oC, afterwards as the density decreases the volume increases. The main reason for this is hydrogen bond in ice gets cleaved due to the melting of ice.

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