| 1 |
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
|
| 2 |
Hook warm larvae enter the body through. |
- A. Food
- B. Water
- C. Skin
- D. All of them
|
| 3 |
Which of the following in insoluble in water. |
- A. Benzene
- B. NaCl
- C. KCl
- D. All of them
|
| 4 |
The removal of Mg<sup>+2</sup> and Ca<sup>+2</sup> Ion which are responsible for the hardness of water is called. |
- A. Temporary hardness
- B. Permanent hardness
- C. Water softening
- D. Hydrogen bonding
|
| 5 |
Permanent hardness can be removed by using . |
- A. Soda lime
- B. Sodium Zeolite
- C. Quick lime
- D. Lime water
|
| 6 |
Mercury poisoning cause: |
- A. neurological damage
- B. high blood pressure
- C. kidney damage
- D. gastro
|
| 7 |
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>
|
| 8 |
The density of water is ................. at 4<sup> o</sup>C |
- A. 1 gcm<sup>-1</sup>
- B. 2 gcm<sup>-1</sup>
- C. 3 gcm<sup>-1</sup>
- D. 4 gcm<sup>-1</sup>
|
| 9 |
Boiling point of water is: |
- A. 0<sup>o</sup>C
- B. 25<sup>o</sup>C
- C. 80<sup>o</sup>C
- D. 100<sup>o</sup>C
|
| 10 |
The process by which water rises up from the roots of plants to leaves is called. |
- A. Photosynthesis
- B. Respiration
- C. Surface tension
- D. Capillary action
|