Humidity, Rainfall and Clouds - Practice Test 1

Attempt the quiz above first, then review every question with its correct answer and a short explanation below.

1. Q1.The amount of water vapor present in the air is called:

   • A.Humidity✓ Correct Answer
   • B.Evaporation
   • C.Condensation
   • D.Precipitation

   Explanation: Humidity is the general term for the amount of water vapor in the air.

2. Q2.Which instrument is used to measure Humidity?

   • A.Barometer
   • B.Thermometer
   • C.Hygrometer✓ Correct Answer
   • D.Anemometer

   Explanation: A Hygrometer (specifically a psychrometer) measures relative humidity.

3. Q3.Relative Humidity is expressed in:

   • A.Grams
   • B.Kilograms
   • C.Percentage✓ Correct Answer
   • D.Degrees

   Explanation: Relative Humidity is the ratio of actual water vapor to the capacity of air, expressed as a percentage.

4. Q4.The temperature at which air becomes saturated is called:

   • A.Freezing Point
   • B.Boiling Point
   • C.Dew Point✓ Correct Answer
   • D.Melting Point

   Explanation: Dew Point is the temperature at which condensation begins.

5. Q5.Which type of humidity changes with temperature even if the amount of water vapor remains constant?

   • A.Absolute Humidity
   • B.Specific Humidity
   • C.Relative Humidity✓ Correct Answer
   • D.Mixing Ratio

   Explanation: Relative Humidity is inversely related to temperature (warm air holds more moisture).

6. Q6.The actual amount of water vapor present in a unit volume of air is:

   • A.Relative Humidity
   • B.Absolute Humidity✓ Correct Answer
   • C.Specific Humidity
   • D.Vapor Pressure

   Explanation: Absolute Humidity is measured in grams per cubic meter (g/m³).

7. Q7.Evaporation is faster when the air is:

   • A.Cool and Wet
   • B.Warm and Dry✓ Correct Answer
   • C.Still and Humid
   • D.Cold and Damp

   Explanation: Warm, dry, and windy conditions promote faster evaporation.

8. Q8.The process of conversion of water vapor into water is called:

   • A.Evaporation
   • B.Condensation✓ Correct Answer
   • C.Sublimation
   • D.Precipitation

   Explanation: Condensation turns gas into liquid.

9. Q9.Which of these is NOT a form of condensation?

   • A.Dew
   • B.Frost
   • C.Fog
   • D.Rain✓ Correct Answer

   Explanation: Rain is a form of precipitation (falling down), not just condensation (floating/surface).

10. Q10.Dew forms when:

    • A.Dew point is below freezing point
    • B.Dew point is above freezing point✓ Correct Answer
    • C.Sky is cloudy
    • D.Wind is strong

    Explanation: If dew point is above freezing, water droplets form (Dew). If below, ice crystals form (Frost).

11. Q11.White frost creates icy crystals when the dew point is:

    • A.Above 0°C
    • B.At or Below 0°C✓ Correct Answer
    • C.Above 10°C
    • D.Exactly 4°C

    Explanation: Frost forms when the dew point is at or below freezing point.

12. Q12.Fog is essentially a:

    • A.Cloud at ground level✓ Correct Answer
    • B.High altitude cloud
    • C.Type of rain
    • D.Dust storm

    Explanation: Fog is a cloud with its base at or very near the ground.

13. Q13.Mist differs from Fog in that mist contains:

    • A.More moisture✓ Correct Answer
    • B.Less moisture
    • C.No moisture
    • D.Ice crystals

    Explanation: Mist has higher moisture content than fog, but fog is denser with lower visibility.

14. Q14.Smog is a combination of:

    • A.Smoke and Fog✓ Correct Answer
    • B.Snow and Fog
    • C.Smoke and Rain
    • D.Sand and Fog

    Explanation: Smog = Smoke + Fog, common in polluted industrial areas.

15. Q15.Clouds are classified based on their:

    • A.Color and Size
    • B.Height, Expanse, and Density✓ Correct Answer
    • C.Weight
    • D.Speed

    Explanation: Clouds are classified by height (High, Middle, Low) and form (Cirrus, Cumulus, Stratus).

16. Q16.Which clouds are formed at the highest altitude?

    • A.Cirrus✓ Correct Answer
    • B.Cumulus
    • C.Stratus
    • D.Nimbus

    Explanation: Cirrus clouds form at 8,000-12,000 meters and consist of ice crystals.

17. Q17.Cirrus clouds look like:

    • A.Feathers / Wispy✓ Correct Answer
    • B.Cotton wool
    • C.Sheets / Layers
    • D.Dark masses

    Explanation: They appear as thin, wispy feathers.

18. Q18.Which clouds look like cotton wool and have a flat base?

    • A.Stratus
    • B.Cumulus✓ Correct Answer
    • C.Cirrus
    • D.Alto

    Explanation: Cumulus clouds are fluffy with a flat base, forming at 4,000-7,000m.

19. Q19.Layered clouds covering large portions of the sky are called:

    • A.Cumulus
    • B.Stratus✓ Correct Answer
    • C.Cirrus
    • D.Nimbus

    Explanation: Stratus clouds are layered sheets.

20. Q20.Nimbus clouds are associated with:

    • A.Fair weather
    • B.Rain and Darkness✓ Correct Answer
    • C.High altitude
    • D.Ice crystals

    Explanation: Nimbus means 'rain'. They are dark, low clouds causing precipitation.