Class 8, Maths, Chapter 12, Exercise 12.2 Solutions
Q.1. Express the following numbers in standard form.
(i) 0.0000000000085
(ii) 0.00000000000942
(iii) 6020000000000000
(iv) 0.00000000837
(v) 31860000000
Q.2. Express the following numbers in usual form.
(i) 3.02 ×10–6
(ii) 4.5 × 104
(iii) 3 ×10–8
(iv) 1.0001 ×109
(v) 5.8 ×1012
(vi) 3.61492 × 106
Q.3. Express the number appearing in the following statements in standard form.
(i) 1 micron is equal to $\frac{1}{1000000}$m.
(ii) Charge of an electron is 0.000,000,000,000,000,000,16 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
Q.4. In a stack there are 5 books each of thickness 20mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?
