| 1 |
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
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| 2 |
Which one of the following salts makes the water permanent 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>
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| 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 |
Hook warm larvae enter the body through. |
- A. Food
- B. Water
- C. Skin
- D. All of them
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| 5 |
the removal of which ion causes water softening. |
- A. Na<sup>+</sup>
- B. Mg<sup>2</sup>
- C. Li<sup>+</sup>
- D. K<sup>+</sup>
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| 6 |
Freezing point of water is: |
- A. -4°C
- B. 0°C
- C. -36°C
- D. -58°C
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| 7 |
Which element do not causes toxicity in water? |
- A. Lead
- B. Arsenic
- C. Sodium
- D. Mercury
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| 8 |
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
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| 9 |
Temporary hardness is because of . |
- A. Ca(HCO<sub>3</sub>)<sub>2</sub>
- B. CaCO<sub>3</sub>
- C. MgCO<sub>3</sub>
- D. MgSO<sub>4</sub>
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| 10 |
Which one of the following diseases severe diarrhea and can be fatal? |
- A. Joundice
- B. Cholera
- C. Dysentery
- D. Typhoid
|