Thermal Expansion, Thermometry And Calorimetry Test -2

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Thermal Expansion, Thermometry And Calorimetry Test -2

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Question 1
1 / -0

Liquid is filled in a flask up to a certain point. When the flask is heated, the level of the liquid

A
Immediately starts increasing

B
Initially falls and then rises

C
Rises abruptly

D
Falls abruptly

Solution

Since both the liquid and the flask undergoes volume expansion and the flask expands first therefore the level of the liquid initially falls and then rises.
Question 2
1 / -0

In cold countries, water pipes sometimes burst, because

A
Pipe contracts

B
Water expands on freezing

C
When water freezes, pressure increases

D
When water freezes, it takes heat from pipes

Solution

In anomalous expansion, water contracts on heating and expands on cooling in the range 0°C to 4°C. Therefore water pipes sometimes burst, in cold countries.
Question 3
1 / -0

Two metal strips that constitute a thermostat must necessarily differ in their

A
Mass

B
Length

C
Resistivity

D
Coefficient of linear expansion

Solution

Thermostat is used in electric apparatus like refrigerator, Iron etc for automatic cut off. Therefore for metallic strips to bend on heating their coefficient of linear expansion should be different.