Class 9 Atmospheric Pressure and Winds Mock Test (ICSE)

Topics in Atmospheric Pressure and Winds

• Pressure belts
• Planetary winds
• Periodic and local winds
• Cyclones and anticyclones

Atmospheric Pressure and Winds practice questions with answers

1. Q1Multiple choice·1 mark
   Which planetary winds blow steadily from the Sub-tropical High Pressure Belts towards the Equatorial Low Pressure Belt?

   1. (a)Westerlies
   2. (b)Monsoon winds
   3. (c)Polar Easterlies
   4. (d)Trade Winds
   Show answer and step marks

   1. Correct option: (d) Trade Winds+1

   Answer: (d)
2. Q2Multiple choice·1 mark
   Which of the following best describes the wind circulation in a tropical cyclone in the Northern Hemisphere?

   1. (a)Outward and clockwise
   2. (b)Inward and counter-clockwise (anticlockwise)
   3. (c)Outward and counter-clockwise
   4. (d)Inward and clockwise
   Show answer and step marks

   1. Correct option: (b) Inward and counter-clockwise (anticlockwise)+1

   Answer: (b)
3. Q3Multiple choice·1 mark
   The low-pressure belt formed around $60^{\circ}\text{N}$ and $60^{\circ}\text{S}$ latitudes due to the rotation of the Earth is known as:

   1. (a)Equatorial Low Pressure Belt
   2. (b)Sub-tropical High Pressure Belt
   3. (c)Sub-polar Low Pressure Belt
   4. (d)Polar High Pressure Belt
   Show answer and step marks

   1. Correct option: (c) Sub-polar Low Pressure Belt+1

   Answer: (c)
4. Q4Multiple choice·1 mark
   A periodic local wind that develops due to differential heating of land and water, blowing from the sea towards the land during the day, is called:

   1. (a)Land breeze
   2. (b)Chinook
   3. (c)Foehn
   4. (d)Sea breeze
   Show answer and step marks

   1. Correct option: (d) Sea breeze+1

   Answer: (d)
5. Q5Short answer·2 marks
   State two main differences between a cyclone and an anticyclone with respect to their atmospheric pressure at the centre and the associated weather conditions.
   Show answer and step marks

   1. Pressure system: A cyclone has low pressure at the centre and high pressure surrounding it, whereas an anticyclone has high pressure at the centre and low pressure surrounding it.+1
   2. Weather conditions: Cyclones are associated with cloudy skies, strong winds, and heavy rainfall, whereas anticyclones bring calm, clear skies, and settled weather.+1

   Answer: Pressure: a cyclone has low pressure at the centre with higher pressure around it, while an anticyclone has high pressure at the centre with lower pressure around it. Weather: a cyclone brings cloudy, stormy and rainy weather with strong winds, while an anticyclone generally brings clear skies, calm air and dry, settled weather.

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