Class 9 Tides and Ocean Currents Mock Test (ICSE)

Topics in Tides and Ocean Currents

• Causes of tides
• Spring and neap tides
• Ocean currents and their causes
• Gulf Stream, North Atlantic Drift, Labrador Current, Kuroshio and Oyashio
• Effects of ocean currents

Tides and Ocean Currents practice questions with answers

1. Q1Multiple choice·1 mark
   Which of the following is a characteristic effect of cold ocean currents flowing along the western coasts of continents in tropical and subtropical latitudes?

   1. (a)Substantial rise in the average annual temperature of the region
   2. (b)Increase in relative humidity and heavy rainfall
   3. (c)Development of arid conditions or deserts along the coast
   4. (d)Melioration of climate making it warm and equable
   Show answer and step marks

   1. Correct option: (c) Development of arid conditions or deserts along the coast, as cold currents stabilise the overlying air and discourage precipitation.+1

   Answer: (c)
2. Q2Multiple choice·1 mark
   The primary cause of the occurrence of tides on the Earth's surface is:

   1. (a)The gravitational pull of the Sun and the Moon on the Earth
   2. (b)Differences in atmospheric pressure over the oceans
   3. (c)The rotation of the Earth on its own axis
   4. (d)Convection currents flowing deep within the Earth's mantle
   Show answer and step marks

   1. Correct option: (a)+1

   Answer: (a)
3. Q3Multiple choice·1 mark
   Which of the following is considered a primary planetary cause for the movement of surface ocean currents?

   1. (a)The gravitational pull of the Moon on ocean water
   2. (b)Heat released by volcanic eruptions on the ocean floor
   3. (c)Trade winds and westerlies blowing over the sea
   4. (d)Earthquakes that shake the ocean floor along plate edges
   Show answer and step marks

   1. Correct option: (c) Trade winds and westerlies blowing over the sea+1

   Answer: (c)
4. Q4Multiple choice·1 mark
   During which lunar phase do neap tides occur?

   1. (a)Full Moon and New Moon
   2. (b)Solar eclipse only
   3. (c)First quarter and third quarter Moon
   4. (d)Perigee position of the Moon only
   Show answer and step marks

   1. Correct option: (c)+1

   Answer: (c)
5. Q5Short answer·2 marks
   State two differences between the Gulf Stream and the Labrador Current with respect to their origin and temperature characteristics.
   Show answer and step marks

   1. Origin: the Gulf Stream originates in the Gulf of Mexico, whereas the Labrador Current originates in the Arctic Ocean (via Baffin Bay).+1
   2. Temperature: the Gulf Stream is a warm current, whereas the Labrador Current is a cold current.+1

   Answer: Gulf Stream is a warm current from the Gulf of Mexico; Labrador Current is a cold current from the Arctic.

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