Ncert Solutions for Exponents Class 8 maths Chapter 12 CBSE Part 2

In this page we have NCERT book Solutions for Class 8th Maths:Exponents and Power Chapter 12 for EXERCISE 2 . Hope you like them and do not forget to like , social share and comment at the end of the page.
Question 1
Express the following numbers in standard form.
1. 0.0000000000085
2. 0.00000000000942
3. 6020000000000000
4. 0.00000000837
5. 31860000000

1. 0.0000000000085 =8.5 ×10-12
2. 0.00000000000942 =9.42×10-12
3. 6020000000000000 =6.02×1015
4. 0.00000000837 =8.37 ×10-9
5. 31860000000 =3.186×1010
Question 2
Express the following numbers in usual form.
1. 3.02 x 10-6
2. 4.5 x 104
3. 3 x 10-8
4. 1.0001 x 109
5. 5.8 x 1012
6. 3.61492 x 106

1. 3.02 x 10-6 = .00000302
2. 4.5 x 104 =45000
3. 3 x 10-8 =.00000003
4. 1.0001 x 109 =1000100000
5. 5.8 x 1012 =5800000000000
6. 3.61492 x 106
=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

1. 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?