Quiz for Thermal expansion

Q1: Which of the following expands least for equal rise in temperature?

A. Solids B. Liquids C. Gases D. All expand equally

Q2: Which quantity remains unchanged during linear expansion?

A. Length B. Volume C. Mass D. Density

Q3: Which metal has the highest coefficient of linear expansion?

A. Copper B. Aluminum C. Iron D. Lead

Q4: A metal rod is heated. Which of the following increases?

A. Mass B. Density C. Length D. Number of atoms

Q5: If α is the linear expansion coefficient, the area expansion coefficient is approximately:

A. α B. 2α C. 3α D. α²

Q6: Thermal expansion in liquids is generally measured in terms of:

A. Linear expansion B. Areal expansion C. Volume expansion D. Mass expansion

Q7: Which of the following is most affected by temperature change?

A. Volume B. Mass C. Specific heat D. Refractive index

Q8: Which statement is correct about expansion of gases?

A. Linear expansion B. Area expansion C. Only mass increases D. Volume expansion occurs

Q9: Invar is used in precision instruments due to its:

A. High conductivity B. Zero expansion C. Low expansion D. High specific heat

Q10: A wire of length L is heated by ΔT. Increase in length is proportional to:

A. L only B. ΔT only C. LΔT D. 1/ΔT

Q11: What happens to the density of a substance when it expands?

A. Increases B. Decreases C. Remains constant D. Becomes infinite

Q12: The expansion of solids is mainly due to:

A. Breaking of bonds B. Increase in mass C. Vibration of atoms D. Formation of new atoms

Q13: The unit of volume expansion coefficient is:

A. K B. K⁻¹ C. m³/K D. kg/K

Q14: Which of the following substances contracts on heating?

A. Water (0°C–4°C) B. Mercury C. Copper D. Lead

Q15: Which device works on the principle of differential expansion?

A. Thermometer B. Calorimeter C. Barometer D. Bimetallic strip

Q16: A substance has α = 1×10⁻⁵ K⁻¹. Its length increases by 0.2%. What is the temperature change?

A. 200 K B. 100 K C. 20 K D. 2 K

Q17: The formula for volumetric expansion is:

A. ΔV = αVT B. ΔV = βVT C. ΔV = γT D. ΔV = α²T

Q18: In general, how does expansion vary among solids, liquids, and gases?

A. Solids > Liquids > Gases B. Gases > Liquids > Solids C. Liquids > Gases > Solids D. All equal

Q19: Thermal expansion is a result of:

A. Thermal conduction B. Kinetic energy decrease C. Increased atomic vibration D. Change in mass