HEY....here r some questions on chapter 1 by me (priya) :)

CHAPTER 1 : STANDARD FORM EXERCISE

1. Round off each of the following numbers to 3 significant figures.

(a)   2963              = __________________

(b)   51852              = __________________

2. Round off  71.65 to

(a) 3 Significant figures = __________________

(b) 1 Significant figures = __________________

3. Round off  0.06053  to 

(a) 3 Significant figures = __________________

(b) 2 Significant figures = __________________

(c) 1 Significant figures = __________________

4. Express each of the following numbers in standard form

(a)    48000              = ___________________

(b)    9200.05              = ___________________

(c)    0.026              = ___________________

(d)    0.00000038          = ___________________

5. Convert the following numbers in standard form to a single number.

(a)   2.19×10^3 = ___________________

6. Evaluate each of the following and express your answers in standard form.

(a) 16000000 + 2500000 = ____________________

(b) 0.69 + 10.451  = ____________________

7. Evaluate each of the following and express your answers in standard form.

(a) 920000 – 87000  = ____________________

(b) 0.043 – 0.00095  = ____________________

10. Given that the mass of   a carbon atom and  an oxygen atom  are 2 x 10^-23 g and 2.7 x 10^-23   respectively,   one molecule of  carbon dioxide  gas  consist of  one carbon atom and two oxygen atoms. Calculate the mass in gram, of one molecule of carbon dioxide gas.

                                                                                            

Answer : _________________

By: Priyalini :D