Geographical Investigation on water- Using of instruments

Turbidity measures the (a)   of water.

Choose the correct steps to measure turbidity.

• 1) Fill in the cylinder with water.

  2) Place the secchi disk sticker on the bottom of the cylinder.

  3) Use the turbidity chart to compare results.

• 1) Stick the secchi disk sticker on the bottom of the cylinder.

  2) Fill in the cylinder with water.

  3) Use the turbidity chart to compare and record results.

Dissolved oxygen is measured in _______.

• JTU

• Litres

• parts per million (ppm)

• No units

Ensure there is visible air bubbles when testing for dissolved oxygen.

• True

• False

When testing for dissolved oxygen, how long do you need to shake the test tube?

_______ the viable up-down to dissolve tablet when testing for pH.

• Mix with spatula

• Shake

• Tilt