Question

State 'T' for true and 'F' for false.
(P) Length of ribbon required to cover the semicircular disc of radius $10cm$ is $51.4cm$.
(Q) Ratio of circumference of a circle to its radius is always $2\pi :1$
(R) $500m^2=5hectares$
(S) If $1m^2=xm{m}^2$, then the value of $x$ is $100000$.

• A. T F F F
• B. F F T F
• C. T F F T
• D. T T F F

Answer 1

Answer: (D)

T T F F

(P) We have, Radius of disc $=10cm$
Length of ribbon required $=(\frac{1}{2}\times 2\pi r+2r)$
$=\frac{22}{7}\times 10+2\times 10=51.42cm$
(Q) $\frac{\text{Circumference of circle}}{\text{Radius of circle}}=\frac{2\pi r}{r}=\frac{2\pi }{1}$
(R) $1hectare=10000m^2$
$\therefore 1m^2=\frac{1}{10000}hectare$
$\Rightarrow 500m^2=\frac{500}{1000}hectare=\frac{1}{20}hectare$
(S) $1m^2=(1000\times 1000)m{m}^2=xm{m}^2$
$\therefore x=1000000$.