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- 1. Multiple Choice
1. About _____% of the earth surface is covered by water.
(a) 70%
(b) 60%
(c) 80%
- 2. Multiple Choice
2. The up and down movements seen on the surface of ocean water are known as ____ .
(a) Tides
(b) Ocean Currents
(c) Waves
- 3. Multiple Choice
3. The _____ of the winds blowing over the ocean is the most important cause of the waves.
(a) Pulling action
(b) Pushing action
(c) friction
- 4. Multiple Choice
4. Tides are caused mainly by _____.
(a) attraction of the moon
(b) gravitation of the earth
(c) friction of winds
- 5. Multiple Choice
5. Select from the following a warm current of the Atlantic Ocean.
(a) Gulf stream
(b) Kuroshio Current
(c) Labrador current
- 6. Multiple Choice
6. Which of the following is the source of fresh water?
(a) Seas
(b) Oceans
(c) Snow and ice
- 7. Multiple Choice
7. The raised part of the wave is called the _____ of the wave and lower part is called the ____ of the wave.
(a) trough and crest
(b) crest and trough
(c) crest and tough
- 8. Multiple Choice
8.North Western Europe is warmer than north- eastern America due to_______.
(a) lower latitude
(b) ocean current
(c) lower altitude
- 9. Multiple Choice
9. The cyclones produce very high waves in the sea, so __________ coast of India experiences such high waves during the summer months.
(a) Eastern
(b) Western
(c) Southern
- 10. Multiple Choice
10.The periodic rising and falling of sea waters.
(a) Waves
(b) Tides
(C) Ocean Currents
- 11. Multiple Choice
11._____ occur when the sun, the moon and the earth are in a straight line.
(a) Spring tides
(b) Neap Tides
(c) Bore Tides
- 12. Multiple Choice
12. ______ occur when the sun, the moon and the earth form three corners of a triangle, the attraction of the sun and Moon neutralize each other.
(a) Bore Tides
(b) Spring tides
(c) Neap Tides
- 13. Multiple Choice
13.____ currents are those that originate near the equator and flow towards the poles.
(a) Warm
(b) Cold
- 14. Multiple Choice
14. Ocean Currents are formed by the difference in the density of sea water. This difference is because of variation in _____ and salinity.
(a) Pressure
(b) Temperature
(c) Force
- 15. Multiple Choice
15.The mixing of warm and cold currents helps in the production of __
(a) reefs
(b) planktons
(c) red algae
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