Total Surface Area of a Cuboid

Q. The external dimensions of a wooden box are 18 cm, 10 cm and 6 cm respectively and thickness of the wood is 5 mm. If the empty box weighs 3.15 kg, then the weight of $1c{m}^3$ of wood is ________.

1. 7 grams

2. 10 grams

3. 1 grams

4. 15 grams

Q. A small indoor greenhouse is made entirely of glass panes held together with tape. It is $30cm$ long, $25cm$ wide and $25cm$ high. How much of tape is needed for all the 12 edges?.............[ 2 marks]

Q.

What is the surface area of the cuboidal box which is open at the top, if:
$l=$ length of the cuboid,
$b=$ breadth of the cuboid and
$h=$ height of the cuboid

1. $2(lb+bh+lh)$

2. $2lb+2bh+hl$

3. $2lb+bh+2hl$

4. $lb+2bh+2hl$

Q. A match box measures $4\text{cm}\times 2.5\text{cm}\times 1.5\text{cm}.$ Volume of a packet containing 12 such boxes (no space is left in the packet) is ____________.

1. $170{\text{cm}}^3$
2. $150{\text{cm}}^3$
3. $180{\text{cm}}^3$
4. $120{\text{cm}}^3$

Q.

Which among the following will have the largest value?

1. Surface area of a cube with side $6\text{cm}$.

2. Surface area of a cuboid with $l=7\text{cm},b=6\text{cm}$ and $h=5\text{cm}$.

3. Surface area of the walls of a cube having side $8\text{cm}$.

4. Surface area of the walls of a cuboid having $l=10\text{cm},b=5\text{cm}$ and $h=6\text{cm}$.

Q.

The surface area of a cuboid is 1372 $c{m}^2$. If its dimensions (l:b:h) are in the ratio 4 : 2 : 1, then its length(in cm) is:

1. $14cm$

2. $28cm$

3. $21cm$

4. $24cm$

Q.

A Cuboid has length, breadth and height of 6 cm, 4 cm and 2 cm respectively. Find the total surface area of Cuboid.

1. $22{\text{cm}}^2$

2. $88{\text{cm}}^2$

3. $176{\text{cm}}^2$

4. $44{\text{cm}}^2$

Q.

The length of a cuboid is twice its breadth. The breadth is twice its height. Find the ratio of the lateral surface area to the total surface area of the cuboid. Given that the height of the cuboid is $2\text{cm}$.

1. $7:2$

2. $7:4$

3. $3:7$

4. $3:8$

Q. If each edge of a cube is increased by $50\%$, then find the percentage increase in its surface area.

1. $125\%$
2. $150\%$
3. $175\%$
4. $110\%$

Q.

The total surface area of a cuboid with dimensions of $26m,14m$ and $6.5m$ respectively is ___ $m^2$.