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Ncert Solutions for Exponents Class 8 CBSE Part 2



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 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

Answer
  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

Answer
  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

Answer
  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?

Answer
Total thickness
=5×20  + 5X.016
=100  + 5× 1.6 ×10-2
=100  + .08
=100.08 mm

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