Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

A steel tape 1m long is correctly calibrated for a temperature of 27.0^∘C. The length of a steel rod measured by this tape is found to be 63.0 cm on a hot day when the temperature is 45.0 ^∘C. What is the actual length of the steel rod on that day? Coefficient of linear expansion of steel = 1.20 × 10⁻⁵

A
63.0146 cm

B
63.0136 cm

C
63.0126 cm

D
63.0116 cm

Solution

Δl = αlΔT = 1.20 × 10⁻⁵× 63×18 = 0.0136cm

final length =63.0136cm
Question 2
1 / -0

A hole is drilled in a copper sheet. The diameter of the hole is 4.24 cm at 27.0^oC. What is the change in the diameter of the hole when the sheet is heated to 227^oC? Coefficient of linear expansion of copper = 1.70 × 10^-5 K^–1.

A
1.44 x 10⁻² cm.

B
1.24 x 10⁻² cm

C
1.34 x 10⁻² cm

D
1.54 x 10⁻² cm

Solution

Change in diameter
Δl = αlΔT
=1.70 × 10⁻⁵× 4.24 × (227 − 27) = 1.44 × 10⁻²cm