Class 9 Humidity Mock Test (ICSE)

Topics in Humidity

• Absolute and relative humidity
• Condensation and its forms
• Precipitation
• Convectional, orographic and cyclonic rainfall

Humidity practice questions with answers

1. Q1Multiple choice·1 mark
   Which of the following best defines relative humidity?

   1. (a)The actual mass of water vapour present in a unit volume of air
   2. (b)The ratio of the actual amount of water vapour in air to the maximum capacity of air to hold water vapour at that temperature
   3. (c)The mass of water vapour per unit mass of dry air
   4. (d)The total pressure exerted by water vapour in the atmosphere
   Show answer and step marks

   1. Correct option: (b) The ratio of the actual amount of water vapour in air to the maximum capacity of air to hold water vapour at that temperature+1

   Answer: (b)
2. Q2Multiple choice·1 mark
   Which form of condensation occurs as tiny water droplets deposited on cold ground surfaces and vegetation on a clear, calm winter night?

   1. (a)Frost
   2. (b)Mist
   3. (c)Dew
   4. (d)Fog
   Show answer and step marks

   1. Correct option: (c) Dew+1

   Answer: (c)
3. Q3Multiple choice·1 mark
   Which type of rainfall is characterized by heavy downpours accompanied by thunder and lightning, commonly experienced daily in the equatorial regions?

   1. (a)Orographic rainfall
   2. (b)Convectional rainfall
   3. (c)Frontal rainfall
   4. (d)Cyclonic rainfall
   Show answer and step marks

   1. Correct option: (b) Convectional rainfall+1

   Answer: (b)
4. Q4Multiple choice·1 mark
   What is the term for precipitation consisting of hard, rounded pellets or lumps of ice ranging from $5\text{ mm}$ to $50\text{ mm}$ in diameter, produced during violent thunderstorms?

   1. (a)Snow
   2. (b)Hail
   3. (c)Drizzle
   4. (d)Sleet
   Show answer and step marks

   1. Correct option: (b) Hail+1

   Answer: (b)

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