Question 1: Find the number of significant Figures in each of the following measurements:

(i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (xi) (x) (xi) (xii)

Answer:

i) has two significant figures

ii) has four significant figures

iii) has three significant figures

iv) has three significant figures

v) has four significant figures

vi) has two significant figures

vii) has six significant figures

viii) has five significant figures

xi) has eight significant figures

x) has four significant figures

xi) has four significant figures

xii) has six significant figures

Question 2: Round off each of the following measurements correct to four significant figures:

i) ii) iii)

iv) v) vi)

Answer:

i)

The measurement has significant figures.

To round it off to significant figures, we require rounding it off to places after the decimal.

Therefore rounded off to significant figures.

ii)

The measurement has significant figures.

To round it off to significant figures, we require rounding it off to places after the decimal.

Therefore rounded off to significant figures.

iii)

The measurement has significant figures.

To round it off to significant figures, we require rounding it off to places after the decimal.

Therefore rounded off to significant figures.

iv)

The measurement has significant figures.

To round it off to significant figures, we require rounding it off to places after the decimal.

Therefore rounded off to significant figures.

v)

The measurement has significant figures.

To round it off to significant figures, we require rounding it off to places after the decimal.

Therefore rounded off to significant figures.

vi)

The measurement has significant figures.

To round it off to significant figures, we require rounding it off to places after the decimal.

Therefore rounded off to significant figures.

Question 3: Round off:

i) correct to three significant figures.

ii) correct to four significant figures.

iii) correct to two significant figures.

iv) correct to three significant figures.

v) correct to one significant figure.

vi) correct to two significant figures.

Answer:

i) correct to three significant figures

ii) correct to four significant figures

iii) correct to two significant figures

iv) correct to three significant figures

v) correct to one significant figure

vi) correct to two significant figures

Question 4: Round off:

i) to the nearest rupee ii) to the nearest gram

iii) to the nearest paisa iv) to the nearest cm

Answer:

i) to the nearest rupee

ii) to the nearest gram

iii) to the nearest paisa

iv) to the nearest cm