| 1 |
How many percentage to water contains oceans? |
- A. 67%
- B. 77%
- C. 87%
- D. 97%
|
| 2 |
Permanent hardness is removed by adding. |
- A. Na<sub>2</sub> zeolite.
- B. Soda lime
- C. Lime water
- D. Quick lime
|
| 3 |
Sodium zeolite is naturally occurring reason of . |
- A. NaAl (SiO<sub>3</sub>)<sub>2</sub>
- B. Na<sub>2</sub>CO<sub>3</sub>
- C. CaCO<sub>3</sub>
- D. Na<sub>2</sub>SIO<sub>3</sub>
|
| 4 |
Water become hard because of: |
- A. Ca+2
- B. Mg+2
- C. SO-24
- D. all of these
|
| 5 |
Which process is responsible for ascending of water in roots: |
- A. evaporation
- B. transpiration
- C. condensation
- D. capillary action
|
| 6 |
Example of pest is |
- A. Weeds
- B. Herbs
- C. Insect
- D. All of them
|
| 7 |
Mg<sup>2+</sup> and Ca<sup>2+</sup> ions react with soap to form calcium and magnesium salts of fatty acids called. |
- A. Gelatin
- B. Scum
- C. Paste
- D. None of them
|
| 8 |
Vibrious cholera bacteria causes the disease |
- A. Cholera
- B. Diarrhea
- C. Jaundice
- D. Hepatitis
|
| 9 |
Temporary hardness in water can he removed by. |
- A. Boiling Method
- B. Using washing soda
- C. Using sodium zeolite
- D. All of them
|
| 10 |
Freezing point of water is: |
- A. -4°C
- B. 0°C
- C. -36°C
- D. -58°C
|