Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

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

A
bend with steel on the concave side

B
get twisted

C
remain straight

D
bend with steel on the convex side

Solution

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].
Question 2
1 / -0

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:

A
Radius 1 cm, length 2 m

B
Radius 1 cm, length 1 m

C
Radius 2 cm, length 4 m

D
Radius 3 cm, length 8 m

Solution

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.
Question 3
1 / -0

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

A
-273°C, -273 °F

B
-30°C, -30 °F

C
0 °C, 0 °F

D
-40 °C, -40 °F

Solution

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.
Question 4
1 / -0

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:

A
Equal to 30 cm

B
less than 30 cm

C
cannot be perdicted

D
more than 30 cm

Solution

When heated the length between adjacent markings increases. Hence the actual length will be less than
30 cm.
Question 5
1 / -0

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

A
Gaseous

B
Solid

C
Liquid

D
none of these

Solution

Gas expands more than solid and liquid because gas particles are far apart hence freely move.
Question 6
1 / -0

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

A
α₁+ α₂+ α₃

B
α₁+ α₂- α₃

C
α₁- α₂- α₃

D
(α₁+ α₂)/ α₃

Solution

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.
Question 7
1 / -0

Relationship for converting the Fahrenheit and Celsius scales is

A

B

C

D

Solution
Question 8
1 / -0

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

A
first decreases and then increases

B
goes on increasing

C
remains constant up to 15°C and then increases

D
goes on decreasing

Solution

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.
Question 9
1 / -0

The relation between coefficient of volume expansion and coefficient of linear expansion is

A
α_v = 2α₁

B
α₁ = 3α_v

C
α_v = 3α₁

D
α₁ = 2α_v

Solution

This is simple because the coefficients of linear expansion α_L, areal expansion α_A, and volume expansion α_v, are in the ratio of 1: 2: 3 i.e.:
α_L: α_A: α_v :: 1: 2: 3
Hence, α_v = 3α_L
Question 10
1 / -0

Water contract on heating between the temperatures

A
0°C to 4°C

B
0°K to 4°K

C
0^o K to 273 K

D
0°F to 4°F

Solution

When water is heated from 0^oC, its volume decreases because its density increases and you can see this effect upto 4^oC. Since the density of ice is maximum at 4^oC, 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.