Superficial Expansion

Q.

Define the coefficient of superficial expansion.

Q. A thick glass tumbler cracks when boiling hot water is poured in it.

1. True
2. False

Q. When a flat sheet of copper is heated , the increase in its area is called cubical expansion.

1. True
2. False

Q.

An increase in the surface area of a solid is called

1. linear expansion

2. cubical expansion

3. superficial expansion

Q.

How extract a tight fitting cork in the neck of a delicate glass bottle?

Q.

When boiling hot water is poured into a thick glass tumbler, it cracks because:

1. Its outer surface expands more than the inner surface

2. Its outer surface expands less than the inner surface

3. Its outer and inner surfaces expand in opposite directions

4. None of the above

Q.

Why does a thick glass tumbler crack when very hot water is poured into it?

Q. Why does a thick tumbler crack when hot water is poured into it? $\left[2\text{marks}\right]$
Can the tumbler also crack when very cold water is poured into it? If so, why? $\left[3\text{marks}\right]$

Q. The expansion in area is called__________.

1. linear expansion
2. superficial expansion
3. cubical expansion
4. chemical expansion

Q. When a flat sheet of copper is heated, the increase in its area is called cubical expansion.

1. True
2. False

Q. The increase in area of an object on heating, is known as superficial expansion.

1. True
2. False

Q. A manganese sheet of dimensions $20\text{cm}\times 30\text{cm}$ at $25{}^{\circ }\text{C}$ is heated to $75{}^{\circ }\text{C}$, if the area of the sheet is increased by $0.72{\text{cm}}^2$, what is the coefficient of superficial thermal expansion of manganese in ${10}^{-6}{}^{\circ }{\text{C}}^{-1}$?

1. 24

Q.

A thick glass tumbler cracks when hot water is poured into it.

1. True
2. False

Q. A manganese sheet of dimensions $20\text{cm}\times 30\text{cm}$ at $25{}^{\circ }\text{C}$ is heated to $75{}^{\circ }\text{C}$, if the area of the sheet is increased by $1.32{\text{cm}}^2$, what is the coefficient of superficial thermal expansion of manganese?

1. 22 $\times {10}^{-6}{}^{\circ }{\text{C}}^{-1}$
2. 30 $\times {10}^{-6}{}^{\circ }{\text{C}}^{-1}$
3. 44 $\times {10}^{-6}{}^{\circ }{\text{C}}^{-1}$
4. 24 $\times {10}^{-6}{}^{\circ }{\text{C}}^{-1}$

Q. A thick glass tumbler cracks when boiling hot water is poured in it.

1. True
2. False

Q. What is the correct relation between three coefficients of expansion?

1. 1 : 2 : 3
2. 2 : 1 : 3
3. 3 : 2 : 1
4. 1 : 3 : 2

Q. When a flat sheet of copper is heated , the increase in its area is called cubical expansion.

1. True
2. False

Q. The coefficient of superficial thermal expansion of an object is $1.5$ times that of the cubical expansion of the object.

1. True
2. False