Solved Numerical Problem No. 6 ( Unit-1: Measurements ); HSSC-I (Class-11); Physics (Baluchistan Textbook Board, Quetta) With Verified Answers

The radius of a rod is 0.24 cm. Find its cross-sectional area with appropriate significant figures. Ans. (0.18 cm²)  

Given:

Radius of the rod = r = 0.24 cm 

To Find:

The cross-sectional area of the rod = a = ?

Solution:

The cross-sectional area of the rod is given by a formula

a = ㄫ r ²

by putting the values

a = 3.1416 ｘ (0.24 cm)²

a = 3.1416 ｘ 0.0576 cm²

a = 0.18095616

a = 0.18 cm²  ------------------Ans.

According to the rules of significant figures, the answer should be rounded off to 2 decimal places as the given value of radius is 2 DP. 

Similar Questions:

1. (b) Express the following values in terms of scientific notation,

(I) 0.000036. (II) 140000, (III) 107000000

2. Calculate the answer up to appropriate numbers of significant digits 

(a) 246.24 + 238.278 + 98.3 

(b) 1.4 x 2.639 + 117.25

3. Add the given values 12, 13.5, 15.432. Give the answer to correct significant figures. Ans. (41)

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