Superficial Expansion

Q.

Define superficial expansion

Q. In the case of expansion of solids, match the type of expansions with the effects.

1. change in length
2. change in volume
3. change in area

Q.

The increase in length of the solid on heating is called:

1. Length expansion

2. Linear expansion

3. Superficial expansion

4. Cubical expansion

Q.

Explain thermal expansion and its types.

Q.

A room is $4m$ long and $3m50cm$ wide.

How many square meters of carpet are needed to cover the floor of the room?

Q.

A room is $13.6\text{m}$ long and $6.4\text{m}$ wide . Its floor has to cover with square tiles of side $80\text{cm}$ . How many tiles will be required

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?

1. $32\times {10}^{-6}{}^{\circ }{\text{C}}^{-1}$
2. $24\times {10}^{-6}{}^{\circ }{\text{C}}^{-1}$
3. $41\times {10}^{-6}{}^{\circ }{\text{C}}^{-1}$
4. $18\times {10}^{-6}{}^{\circ }{\text{C}}^{-1}$

Q.

The expansion in two dimensions is known as___________ expansions.

Q.

A banquet hall with a floor $25m$ long and $10m$ wide has to be covered with square-shaped shahabad stones, on each of side $50cm.$ Calculate the number of stones that will be required to cover the entire floor of the banquet hall.

Q.

You are given a square plate of side $1m$. The coefficient of linear expansion $\alpha$, obtained the relation between the coefficient of superficial expansion $\beta$ and linear expansion $\alpha$ for the unit rise in temperature.

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 hall is $8m$ long and and $8m60cm$ wide.How many square metres of carpet is needed to cover the floor of the hall?

Q.

A rectangular building lot has a width of $75ft$ and a length of $125ft$. Determine the area of this lot in square meters.

Q. A thin square aluminium sheet of side 1 cm is heated to change its temperature from 20℃ to 120℃. Find the final area of the sheet. (${\alpha }_{aluminium}=24\times {10}^{-6}{K}^{-1}$)

1. 
   $1.0048c{m}^2$
2. 
   $1.048c{m}^2$
3. 
   $1.0024c{m}^2$
4. 
   $1.024c{m}^2$