Atmosphere - Practice Test 5

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

1. Q1.Which layer is characterized by Auroras (Aurora Borealis)?

   • A.Thermosphere / Ionosphere✓ Correct Answer
   • B.Troposphere
   • C.Stratosphere
   • D.Mesosphere

   Explanation: Charged particles interact in the Ionosphere/Thermosphere creating lights.

2. Q2.The dry, dusty wind blowing from Sahara to Guinea coast is:

   • A.Harmattan✓ Correct Answer
   • B.Sirocco
   • C.Khamsin
   • D.Simoom

   Explanation: Harmattan is the specific wind.

3. Q3.In meteorology, 'Lapse Rate' refers to:

   • A.Fall in temperature with altitude✓ Correct Answer
   • B.Fall in pressure with altitude
   • C.Wind speed change
   • D.Humidity change

   Explanation: Temperature decreases as you go up.

4. Q4.Which gas is used by plants for photosynthesis?

   • A.Carbon Dioxide✓ Correct Answer
   • B.Oxygen
   • C.Nitrogen
   • D.Argon

   Explanation: Plants absorb CO2.

5. Q5.Which gas is essential for burning (combustion)?

   • A.Oxygen✓ Correct Answer
   • B.Nitrogen
   • C.Hydrogen
   • D.Carbon Dioxide

   Explanation: Oxygen supports combustion.

6. Q6.The ozone layer protects us from which cancer?

   • A.Skin Cancer✓ Correct Answer
   • B.Lung Cancer
   • C.Blood Cancer
   • D.Bone Cancer

   Explanation: UV radiation causes skin cancer (melanoma).

7. Q7.Cyclonic rainfall is common in:

   • A.Temperate regions (UK, Europe)✓ Correct Answer
   • B.Deserts
   • C.Equatorial regions
   • D.Polar regions

   Explanation: Frontal/Cyclonic rain occurs where warm/cold air meets.

8. Q8.Frontal Rainfall is caused by:

   • A.Meeting of warm and cold air masses✓ Correct Answer
   • B.Mountains
   • C.Convection
   • D.Tides

   Explanation: Warm air rises over cold air at a front.

9. Q9.Which instrument measures atmospheric pressure continuously?

   • A.Barograph✓ Correct Answer
   • B.Barometer
   • C.Thermograph
   • D.Hythergraph

   Explanation: Barograph records pressure over time.

10. Q10.Norwesters are local storms in:

    • A.Bengal and Assam (India/Bangladesh)✓ Correct Answer
    • B.USA
    • C.Australia
    • D.China

    Explanation: Called Kalbaisakhi in Bengal.

11. Q11.Mango Showers help in ripening of mangoes in:

    • A.Kerala and Karnataka✓ Correct Answer
    • B.Punjab
    • C.Bengal
    • D.Odisha

    Explanation: Pre-monsoon showers in South India.

12. Q12.The instrument used to measure rainfall is:

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

    Explanation: Rain Gauge collects and measures rain.

13. Q13.Temperature inversion is most likely to occur on:

    • A.Long winter nights with clear sky✓ Correct Answer
    • B.Cloudy nights
    • C.Summer days
    • D.Windy days

    Explanation: Rapid ground cooling traps cold air under warm air.

14. Q14.The zone of Trade Winds is also called:

    • A.Hadley Cell✓ Correct Answer
    • B.Ferrel Cell
    • C.Polar Cell
    • D.Walker Cell

    Explanation: Trade winds circulate in the Hadley Cell (0-30°).

15. Q15.Westerlies circulate in which cell?

    • A.Ferrel Cell✓ Correct Answer
    • B.Hadley Cell
    • C.Polar Cell
    • D.None

    Explanation: Westerlies are in the Ferrel Cell (30-60°).

16. Q16.Sea smoke is a type of:

    • A.Fog✓ Correct Answer
    • B.Rain
    • C.Cloud
    • D.Wind

    Explanation: It is steam fog over water.

17. Q17.Which layer reflects radio waves?

    • A.Ionosphere✓ Correct Answer
    • B.Mesosphere
    • C.Exosphere
    • D.Troposphere

    Explanation: Repeated concept: Ionosphere.

18. Q18.Clouds are formed by the process of:

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

    Explanation: Water vapor condenses into droplets.

19. Q19.The instrument to measure wind speed is:

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

    Explanation: Repeated concept: Anemometer.

20. Q20.Which phenomenon causes the sky to appear blue?

    • A.Scattering of light✓ Correct Answer
    • B.Reflection
    • C.Refraction
    • D.Absorption

    Explanation: Rayleigh scattering scatters blue light more than red.