Area Expansion — Practice Quiz

Question 1

A copper plate of area 100 cm², α = 17×10⁻⁶/K, heated by 100°C. ΔA:

Accepted Answer

0.34 cm²

Answer

0.17 cm²

Answer

1.7 cm²

Answer

0.034 cm²

Question 2

Relation between area-expansion β and linear-expansion α for an isotropic solid:

Accepted Answer

β = 2α

Answer

β = α

Answer

β = α²

Answer

β = α/2

Question 3

A circular hole in an iron plate is heated. The area of the hole:

Accepted Answer

Increases at the same rate as the plate

Answer

Decreases

Answer

Stays the same

Answer

Depends on hole size

Question 4

If linear coefficient is 11×10⁻⁶/K, area coefficient is:

Accepted Answer

22×10⁻⁶/K

Answer

11×10⁻⁶/K

Answer

33×10⁻⁶/K

Answer

5.5×10⁻⁶/K

Question 5

A square sheet has each side increase by 1%. Area increase:

Accepted Answer

2%

Answer

1%

Answer

0.5%

Answer

4%