Introduction to Water

Q.

Water is called the universal solvent.

1. True

2. False

Q.

The molecular mass of water is ___.

1. 9 u

2. 10 u

3. 18 u

4. 33 u

Q.

Why is water useful to life on the earth?
(i) It maintains ecological balance.
(ii) It sustains life.
(iii) It is necessary for respiration in aquatic organisms.

1. Only (i) and (ii)

2. Only (ii) and (iii)

3. Only (i) and (iii)

4. (i), (ii) and (iii)

Q.

Water is

1. An element

2. A compound.

3. A mixture.

4. Both an element and a compound

Q.

Why are salts dissolved in water important?

1. They are essential for the growth and development of plants.

2. They add taste to water.

3. All of the above

4. They supply essential minerals that our body needs.

Q.

What is the chemical name of water?

1. Hydrogen monoxide

2. Dihydrogen monoxide

3. Dihydrogen oxide

4. Hydrogen oxide

Q.

Water exists in which of the following form(s):

1. Liquid

2. Gas

3. All of the above

4. Solid

Q.

Which of the following is not a property of pure water?

1. Colourless

2. Odourless

3. Tasteless

4. Massless

Q.

The human body contains water up to ___ .

1. 90%

2. 40%

3. 60%

4. 80%

Q.

Triple point of water is:-

1. ${273}^{\circ }C$ or 0 K

2. ${0.01}^{\circ }C$ or 273.16 K

3. ${273.16}^{\circ }C$ or 0.01 K

4. $0^{\circ }C$ or 273 K