| 1 |
Water become hard because of: |
- A. Ca+2
- B. Mg+2
- C. SO-24
- D. all of these
|
| 2 |
The freezing point of water is: |
- A. 10 <sup>o</sup>C
- B. 100<sup>o</sup>C
- C. 0<sup>o</sup>C
- D. 46<sup>o</sup>C
|
| 3 |
Which one of the following properties of water is responsible for rising of water in plants? |
- A. Specific heat capacity
- B. Viscosity
- C. Excellent solvent action
- D. Capillary action
|
| 4 |
Chemical form of gypsum. |
- A. MgSO<sub>4</sub>. 5H<sub>2</sub>O
- B. CaSO<sub>4</sub>. 2H<sub>2</sub>O
- C. FeSO<sub>4</sub>. 5H<sub>2</sub>O
- D. CuSO<sub>4</sub>. 5H<sub>2</sub>O
|
| 5 |
Vibrious cholera bacteria causes the disease |
- A. Cholera
- B. Diarrhea
- C. Jaundice
- D. Hepatitis
|
| 6 |
Temporary hardness can be removed by__________. |
- A. Quick lime
- B. Slaked lime
- C. Lime stone
- D. HCl
|
| 7 |
The percentage of ocean in world water is. |
- A. 50%
- B. 67%
- C. 97%
- D. 25%
|
| 8 |
Which one of the following diseases severe diarrhea and can be fatal? |
- A. Joundice
- B. Cholera
- C. Dysentery
- D. Typhoid
|
| 9 |
Rapid growth of algae in water bodies in because of detergent having. |
- A. Carbonat salt
- B. Sulphonic acid
- C. Sulphat salt
- D. Phosphate salt
|
| 10 |
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>
|
