1 Mark Question

Question 11 Mark

Write 'T' for true and 'F' for false.
Area of a circle $=2\pi\text{r}^2.$

Answer

False.Solution:
Area of a circle $=\pi\text{r}^2$

Question 21 Mark

Write 'T' for true and 'F' for false.
Area of a || gm = (base × height)

Answer

True.

Question 31 Mark

Write 'T' for true and 'F' for false.
Area of a triangle = (base × height)

Answer

False.
Solution:
Area of a triangle $=\frac{1}2{}\times\text{Base}\times\text{Height}$

Question 41 Mark

Write 'T' for true and 'F' for false.
Circumference of a circle $=2\pi\text{r}.$

Answer

True.

Question 51 Mark

Fill in the blanks.
If l, b and h be the length, breadth and height respectively of a room, then area of its 4 walls = sq units.

Answer

If l, b and h be the length, breadth and height respectively of a room, then area of its 4 walls = [2h(l + b)] sq units.

Question 61 Mark

Fill in the blanks.
$1 \text { hectare }=m^2 \text {. }$

Answer

1 hectare $= 1 0 0 0 0 m ^2$.
Solution:
since 1 hecta metre $=100 m$
1 hectare $=(100 \times 100) m ^2$
$=10000 m^2$

Question 71 Mark

Fill in the blanks.
If $d_1$ and $d_2$ be the diagonals of a rhombus, then its are is sq units.

Answer

If $d_1$ and $d_2$ be the diagonals of a rhombus, then its are is $\frac{1}{2} d_1 d_2$ sq units.

Question 81 Mark

Fill in the blanks. 1 are =$m^2$.

Answer

1 are = $100m^2$.

Question 91 Mark

Fill in the blanks. If each side of a triangle is a cm, then its area = $cm^2$.

Answer

If each side of a triangle is a cm, then its area $=\frac{\sqrt{3}}{4}\text{a}^2$ $cm^2$.

Maths 1 Mark Question