1.

The most precise reading of the mass of an objectamong the following is(1) 20g(2) 20.0g(3) 20.01 g(4) 20 x 10° gThe most accurate reading of the length of6.28 cm long fibre is(1) 6 cm(2) 6.5 cm(3) 5.99 cm(4) 6.0 cm6.7.

Answer»

6.. option 3 is correct... as 3 is having most no..of significant figues

7. option 2.

The most accurate reading of the length of a 6.28cm long fibre is 6.5 cm

First note down the difference

(1) 6.28-6 = 0.28

2) 6.5- 6.28 = 0.22

3)6.28-5.99= 0.27

4) 6.28 - 6.0 = 0.28

So, Now compare which is very less difference.

so the nearest accurate to 6.28 is 6.5



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