1.1 Express the following quantities using prefixes. 
(a) 5000 g                                     (b) 2000 000 W 
(c) 52 x10⁻¹⁰ kg                              (d) 225x10⁻⁸ s 
Ans. {(a) 5 kg (b)2MW (c) 5.2 µg (d) 2.25 µs }


1.2 How do the prefixes micro, nano and pico relate to each other?

1.3 Your hair grow at the rate of 1 mm per day. Find their growth rate in nms⁻¹. Ans (11.57 nms⁻¹)


1.4 Rewrite the following in standard form. 
(a) 1168x10⁻²⁷                        (b) 32x10⁵ 
(c) 725 x10⁻⁵ kg                     (d) 0.02 x10⁻⁸

Ans {(a) 1.168x10⁻²⁴ (b) 3.2x10⁶ (c)7.25g (d) 2x10⁻¹⁰}


1.4: Rewrite the following in standard form. 
(a) 6400 Km                         (b) 380,000 Km 
(c) 300,000,000 ms⁻¹             (d) seconds in day

Ans {(a) 6.4 ï½˜ 10³ Km (b) 3.8 ï½˜ 10⁵ Km (c)3ｘ 10⁸ Km (d) 8.64 x10⁴}


1.6: On closing the jaws of a Vernier Calipers, zero of the Vernier scale is on the right to its main scale such that 4th division of its Vernier scale coincides with one of the main scale division. Find its zero error and zero correction. Ans. (+0.04 cm, -0.04 cm)


1.7: A screw gauge has 50 divisions on its circular scale. The pitch of the screw gauge is 0.5 mm. What is its least count? Ans. (0.001 cm)


1.8:  Which of the following quantities have three significant figures? 
(a) 3.0066 m                 (b) 0.00309 kg 
(c) 5.05ｘ10⁻²⁷ kg         (d) 301.0 s 
Ans. {(b) and (c)}

1.9: What are the significant figures in the following measurements? 
(a) 1.009 m                       (b) 0.00450 kg 
(c) 1.66 ï½˜ 10⁻²⁷ Kg            (d) 2001 s 

Ans. {(a) 4 (b) 3 (c) 3 (d) 4}


1.10: A chocolate wrapper is 6.7 cm long and 5.4 cm wide. Calculate its area upto reasonable number of significant figures. Ans. (36 cm²)