chapter 2 form 3(standard form)

The number of significant figures of 0.4200 is?

• 2

• 3

• 4

• 5

Express 0.000405 in standard form.

• 0.405 x 10^-4

• 4.05 x 10^-3

• 4.05 x 10^-4

• 4.05 x 10^-5

Write 2.73 x 10⁵ as single number.

• 2730

• 27300

• 273000

• 2730000

Diagram shows a cylindrical water tank. calculate the volume, in  $mm^3$  , of the tank.

 $\ \left[use\ \pi\ =\frac{22}{7}\right]$  

•  $2.31\ \times10^6$  

•  $2.31\times10^7$  

•  $2.31\ \times10^8$  

•  $2.31\times10^9$  

 $4.16\times10^{-4}\ -5.88\times10^{-5}=$  

•  $3.572\times10^{-4}$  

•  $3.572\times10^{-3}$  

•  $1.72\times10^{-4}$  

•  $1.72\times10^{-3}$  

50 x 50 x 50 x 50 = m x 10⁵.

What is the value of m?

• 1.25

• 6.25

• 62.5

• 125

 $\frac{8.4\times10^{-5}}{0.0007}=$  

•  $1.2\times10^{-9}$  

•  $1.2\times10^{-2}$  

•  $1.2\times10^{-8}$  

•  $1.2\times10^{-1}$  

Evaluate $\left(3-0.168\right)\div40.$  Give the answer correct to 2 significant figures.

• 0.07

• 0.070

• 0.071

• 0.078

What is the value of 0.1246 nanogram in microgram?

• 1.246 x 10^-4

• 1.246 x 10^-15

• 1.246 x 10³

• 1.246 x 10¹⁵

Which of the following is true?

• giga (1 000 000 000 000)

• tera (1 000 000 000 000 000)

• centi (0.01)

• nano (0.000 001)