Which one of the following is NOT true in reference to Air mass?
- A.Air mass forms either in tropical or in polar region
- B.Air mass develops on continents as well as over ocean
- C.Air mass develops in a cyclonic condition
- D.Air mass changes the weather conditions
Correct answer
Explanation
The correct answer is C, Air mass develops in a cyclonic condition. Air masses form under calm, stable, anticyclonic (high-pressure) conditions, not in cyclones.
An air mass is a huge body of air with nearly uniform temperature and humidity across it. It takes on these properties by resting for days or weeks over a large, uniform source region, which needs settled high-pressure weather with light, outward-blowing winds. Cyclones, with their converging and rising air, mix air of different origins instead. Air masses are named by source: continental or maritime, and tropical or polar, giving types such as mT and cP.
A is true: source regions are mainly in the tropical and polar belts, while the middle latitudes are where air masses meet.
B is true: continental air masses form over land and maritime ones over the sea.
D is true: as an air mass moves, it carries its heat and moisture and changes the weather of the places it reaches.
Exam tip: air mass sources = stable anticyclones; where two air masses meet, a front forms.
Practice Questions
View allConsider the following places of India :
1. Itanagar
2. Imphal
3. Agartala
4. Aizawl
Which one of the following is the correct chronological order of the above places in terms of sunrise time?
- A.3-2-1-4
- B.2-1-4-3
- C.1-4-3-2
- D.4-3-2-1
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The sun rises first in the place farthest east, so the order follows longitude: Imphal, Itanagar, Aizawl and then Agartala.
Read the full explanation →"Viticulture" is a common feature of which one of the following Australian cities ?
- A.Adelaide
- B.Darwin
- C.Hobart
- D.Brisbane
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Viticulture, the growing of grapes, is a hallmark of Adelaide, which is surrounded by Australia's best-known wine regions. Adelaide, the capital of South Australia, has a Mediterranean climate with hot, dry summers and mild, wet winters, the conditions grapevines like best.
Read the full explanation →Which of the following statements regarding Barchan is/are correct ?
1. It is a crescent shaped mound of sand, which is deposited by the wind blowing constantly from one direction in a desert.
2. The windward side has a convex steep slope with maximum height at the centre.
3. Two ends of Barchan are called horns and point opposite to the direction the wind blows.
Select the answer using the code given below :
- A.1 only
- B.1 and 2 only
- C.2 and 3 only
- D.1, 2 and 3
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A barchan is a crescent-shaped sand dune built by wind from one steady direction, but its windward slope is gentle and its horns point downwind.
Read the full explanation →Which part of India has the Kalakot tertiary coal field ?
- A.Brahmaputra river basin of Assam
- B.Damodar river basin of Jharkhand and West Bengal
- C.Himalayan mountain region
- D.Cardamom hills in Kerala
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Kalakot lies in the Reasi district of Jammu and Kashmir, in the foothills of the Himalaya. India's coal is of two ages.
Read the full explanation →National Water Academy, a centre of excellence in training and capacity building in water resource, is located at
- A.New Delhi
- B.Kolkata
- C.Pune
- D.Chennai
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The National Water Academy functions at Khadakwasla in Pune, Maharashtra, under the Central Water Commission. The academy began in 1988 as the Central Training Unit of the Central Water Commission and was renamed the National Water Academy in 1997.
Read the full explanation →