1. The earth's atmosphere contains about:
A 80% oxygen, 20% carbon dioxide and 20% of other gases
B 50% hydrogen and 50% helium
C 4⁄5 nitrogen and 1⁄5 oxygen |
2. Our weather occurs mostly in the atmospheric layer called the:
A thermosphere
B troposphere
C stratosphere |
3. The atmospheric pressure at sea level is 1 atmosphere. This is equal to:
A 1000 hectopascals
B 1013 hectopascals
C 1230 hPa |
4. Hot moist air:
A rises
B remains stationary
C falls or sinks |
5. Humidity is the:
A maximum amount of water that the air can support before rain
B uncomfortable sensation humans experience before summer rain
C amount of water vapour in the air |
6. The process which forms clouds from evaporated water vapour is:
A evaporation
B condensation
C precipitation |
7. Falling rain, snow, sleet, hail, fog, mist, dew and frost are all forms of:
A precipitation
B evaporation
C saturation |
8. Moving air is called:
A wind
B mist
C sleet |
9. Stratus, cumulus and nimbus are all forms of:
Arain
Bclouds
Ctornadoes |
10. What forms when a moving mass of cold or cool air moves under a still mass of warm air?
Aa cyclone
Ba cold front
Ca tornado |
11. In the southern hemisphere, cyclones:
Arotate counter-clockwise
Bcreate winds with a maximum speed of 50 km/h
Cform over tropical oceans in summer |
12. On a synoptic chart or weather map, lines joining areas of equal air pressure are called:
Aisobars
Btroughs
Cfronts |
13. An anticyclone or high pressure system is usually associated with:
Aintense rain for short periods
Bdrizzling showers for long periods
Cfine weather |
14. The instrument used to measure wind speed is the:
Abarometer
Bthermometer
Canemometer |
15. The instrument used to measure atmospheric pressure is the:
Abarometer
Bthermometer
Cwind vane |