| 1 |
Temporary hardness in water can he removed by. |
- A. Boiling Method
- B. Using washing soda
- C. Using sodium zeolite
- D. All of them
|
| 2 |
Which disease is caused by polluted water. |
- A. Cholera
- B. Typhoid
- C. Diarrhea
- D. All of them
|
| 3 |
The heat capacity of water is greater than rocks. |
- A. 4 times
- B. 5 times
- C. 6 times
- D. 7 times
|
| 4 |
Which one of the following salts makes the water permanently hard? |
- A. NaCO<sub>3</sub>
- B. NaHCO<sub>3</sub>
- C. CA(HCO<sub>3</sub>)<sub>2</sub>
- D. CaSO<sub>4</sub>
|
| 5 |
Density of water at 4°C is: |
- A. 0.976 gem-3
- B. 1 gem-3
- C. 0.956 gem-3
- D. 1.1 gem-3
|
| 6 |
Temporary hardness is removed by adding. |
- A. Quick lime
- B. Slaked lime
- C. Lime stone
- D. Lime water.
|
| 7 |
Which element protects teeth from decay? |
- A. Potassium
- B. Fluorine
- C. Sodium
- D. Calcium
|
| 8 |
Clark's method is used to remove the hardness of water, in this method which is used. |
- A. Ca(HCO<sub>3</sub>)<sub>2</sub>
- B. Na-Zeolite
- C. Ca-Zeolite
- D. Ca(OH)<sub>2</sub>
|
| 9 |
Water dissolves non-ionic compound by |
- A. Ion-ion forces
- B. Ion-dipole forces
- C. Dipole -dipole forces
- D. Hydrogen bonding.
|
| 10 |
Cholera is caused by |
- A. Protozoa
- B. Virus
- C. Bacteria
- D. Fungi
|