How can you measure the diameter of a cylindrical object precisely?

Choose the best apparatus from the options given below to measure each of the following distances.

• $15 \mathrm{cm}$ ruler marked in millimetres
• Metre rule marked in millimetres
• $10 \mathrm{m}$ measuring tape marked in centimetres
• $100 \mathrm{m}$ measuring tape marked in centimetres

How far you can walk in $2 \mathrm{s}$.

Choose the best apparatus from the options given below to measure each of the following distances.

• $15 \mathrm{cm}$ ruler marked in millimetres
• Metre rule marked in millimetres
• $10 \mathrm{m}$ measuring tape marked in centimetres
• $100 \mathrm{m}$ measuring tape marked in centimetres

How far you can run in $10 \mathrm{s}$?

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

When the planet Jupiter is at a distance of $824.7$ million kilometres from the earth, its angular diameter is measured to be $35.72"$ of arc. The diameter of Jupiter is $\left(y\times {10}^4\right) \mathrm{km}$. The value of number $y$ to the nearest integer is

(Take $\pi =3.14$)