Question : Blue Revolution is related to:

Option 1: Space research

Option 2: Poultry

Option 3: Drinking water

Option 4: Fisheries

Question : Fill in the blank with an appropriate option.

Do you ____ your tap water before drinking?

Option 1: flush

Option 2: filter

Option 3: flirt

Option 4: flicker

Question : When an iron nail is dipped into a coloured copper sulphate solution, its colour changes to_____.

Option 1: green, blue

Option 2: blue, green

Option 3: blue, yellow

Option 4: yellow, blue

Question : A mixture of 70 litres of wine and water contains 10% of water. How much water must be added to make the water $12 \frac{1}{2}\%$ of the resulting mixture?

Option 1: 5 litres

Option 2: 3 litres

Option 3: 2 litres

Option 4: 4 litres

Question : The largest reservoir of fresh water is:

Option 1: Glaciers

Option 2: Ground water

Option 3: Ponds

Option 4: Lakes

Question : Heavy water is used as a coolant in nuclear reactors. Heavy water is

Option 1: Water rich in minerals

Option 2: Ozonised water

Option 3: Water containing minerals of heavy metal

Option 4: Water containing heavy isotope of hydrogen