Water

Total Questions: 21

1 - Aqua is a latin word.what is its meaning?

A ) Earth

B ) Water ✅

C ) Fire

D ) Air

2 - Sea water contains chlorine and-----

A ) Iodine ✅

B ) Phosphorus

C ) Carbon

D ) None of these

3 - The purest form of water can be obtained from-----:

A ) Rain water ✅

B ) Acid rain

C ) Sea water

D ) None of these

4 - During winter in cold countries. the ------- is mixed to melt the ice on the icy roads

A ) Carbon dioxide

B ) Chlorine

C ) Salt ✅

D ) Water

5 - Ice melting point is-----:

A ) 28°C

B ) 30°C

C ) 32°C ✅

D ) 35°C

6 - Ice floats because ----:

A ) Density of water is greater than ice ✅

B ) Density of water is less than ice

C ) Both a and b

D ) None of these

7 - At what temperature water has maximum density?

A ) 0°C

B ) 4°k

C ) 4°F

D ) 4°C ✅

8 - Boiling point of water is----:

A ) 100°C ✅

B ) 210°C

C ) 300°C

D ) 400°C

9 - What is the boiling point (°C) of water at 1 atm?

A ) 70 degrees

B ) 90 degrees

C ) 100 degrees ✅

D ) 110 degrees

10 - What is the pH of pure water at 25°C?

A ) 6

B ) 7 ✅

C ) 8

D ) 9

11 - The potential of pure water is----:

A ) 0 ✅

B ) 1

C ) 2

D ) None of these

12 - Salinity measure in parts per------:

A ) Hundreds

B ) Thousands ✅

C ) Millions

D ) None of these

13 - Which among the following is most soluble in water?

A ) Sand

B ) Oil

C ) Sugar ✅

D ) Plastic

14 - Refractometer used for-------:

A ) Protein

B ) Fats

C ) Vitamin

D ) Sugar ✅

Explanation:

✅ Refractometer is used for 👉 measuring the refractive index of a substance.

✅ Refractometer is used for measuring 👉 sugar content in a solution, especially in liquids like fruit juice, honey, or soft drinks.

This is done by measuring the refractive index, which changes based on how much sugar is dissolved.

✅ A refractometer is an optical instrument used to measure the refractive index of liquids or solids, which helps determine concentration, purity, or composition.

📌 Key Uses:

✅ Determine sugar content (e.g., in fruit juice, honey)
✅ Check salinity (e.g., in aquariums or seawater)
✅ Measure concentration of solutions (e.g., in chemical labs)
✅ Test urine specific gravity (in medical diagnostics
✅ The sugar content is often expressed in °Brix (degrees Brix), which indicates grams of sugar per 100 grams of solution.