In this page we have ** NCERT book Solutions for Class 8th Maths:Exponents** for
EXERCISE 2 . Hope you like them and do not forget to like , social share
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**Question 1 **

Express the following numbers in standard form.

- 0.0000000000085
- 0.00000000000942
- 6020000000000000
- 0.00000000837
- 31860000000

**Answer **

- 0.0000000000085
=8.5 ×10

^{-12} - 0.00000000000942
=9.42×10

^{-12} - 6020000000000000
=6.02×10

^{15} - 0.00000000837
=8.37 ×10

^{-9} - 31860000000
=3.186×10

^{10}

**Question 2 **

Express the following numbers in usual form.

- 3.02 x 10
^{-6} - 4.5 x 10
^{4} - 3 x 10
^{-8} - 1.0001 x 10
^{9} - 5.8 x 10
^{12} - 3.61492 x 10
^{6}

**Answer**

- 3.02 x 10
^{-6}= .00000302

- 4.5 x 10
^{4}=45000

- 3 x 10
^{-8}=.00000003

- 1.0001 x 10
^{9}=1000100000

- 5.8 x 10
^{12}=5800000000000

6. 3.61492 x 10^{6}

=3614920

**Question 3 **

Express the number appearing in the following statements in standard form.

(i) 1 micron is equal to 1/1000000 m.

(ii) Charge of an electron is 0.000, 000, 000, 000, 000, 000, 16 coulomb.

(iii) Size of 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

**Answer **

- 1/1000000

=1×10^{-6}

^{ }2. 0.000, 000, 000, 000, 000, 000, 16

=1.6 ×10^{-19}

3. 0.0000005

=5 ×10^{-7}

4. 0.00001275

=1.275 ×10^{-5}

5. 0.07

=7×10^{-2}

**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?

**Answer**

Total thickness

=5×20 + 5X.016

=100 + 5× 1.6 ×10^{-2}

=100 + .08

=100.08 mm

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