**Exponents and Powers**

**Question 1.****Express the following numbers in standard form(i)** 0.0000000000085

**(ii)**0.00000000000942

**(iii)**6020000000000000

**(iv)**0.00000000837

**(v)**31860000000

**Solution:**

**Question 2.****Express the following(i)** 3.02 x 10

^{-6}

**(ii)**45 x 10

^{4}

**(iii)**3 x 10

^{-8}

**(iv)**1.0001 x 10

^{9}

**(v)**5.8 x 10

^{12}

**(vi)**3.61492 x 10

^{6}

**Solution:**

**Question 3.****Express the number appearing in the following statements in standard form :(i)** 1 micron is equal to m.

**(ii)**Charge of an electron is 0.00000000000000000016 coulomb.

**(iii)**Size of a bacteria is 0.0000005 m.

**(iv)**Size of a plant cell is 0.00001275 m.

**(v)**Thickness of a thick paper is 0.07 mm.

**Solution:**

**Question 4.****In a stack there are 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?**

**Solution:**

Thickness of one book =20 mm

∴ Thickness of 5 books = 5 x 20 mm = 100 mm

Thickness of 1 sheet of paper =0.016 mm

Thickness of 5 sheets of paper = 5 x 0.016 mm = 0.08 mm

Total thickness = 100 mm + 0.08 mm

= 100.08 mm = 1.0008 x 10^{2} mm