Movements of ocean water For Class 11 Important Questions

Q 1 – Seaward movement of water is known as:
(a) Undertow
(b) Ebb
(c) Current
(d) Flood

Q 2 –The most common tidal pattern, featuring two high tides and two low tides each day is called
(a) Neap tide
(b) Mixed tide
(c) semi-diurnal tide
(d) Diurnal tide

Q 3 –he factor that affects the origin and movement of currents is
(a) river flow
(b) salinity and density of water
(c) tides
(d) prevailing winds

Q 4 –______causes waves to travel in the ocean and the energy is released on shorelines.
(a) Wind
(b) Land
(c) Water
(d) Soil

Q 5 –The current of the Atlantic ocean is
(a) west wind drift
(b) Gulf stream
(c) Equatorial counter current
(d) Alaska current

Q 6 –The time between the high tide and low tide, when the water level is falling, is called:
(a) drift
(b) nab
(c) ebb
(d) current

Q 7 –Wave amplitude is:
(a) The height of the wave
(b) The breadth of the wave
(c) Half of the wave height
(d) It is the time interval between two successive waves

Q 8 –Huge masses of floating ice are known as:
(a) Current
(b) Ebb
(c) Icebergs
(d) Flood

Q 9 –Which is the main bank of the world?

(a) Doggar bank
(b) The Grand bank
(c) both of these
(d) none of these

Q 10 –How much part of the earth is covered by water?

(a) 76%
(b) 71%
(c) 7.1%
(d) 81%

Q 11 –The Thermodynamics of the ocean are:
(a) Currents
(b) Waves
(c) Tides
(d) Salinity

Q 12 –The current of the Indian Ocean is
(a) The west wind drift
(b) Labrador
(c) California
(d) Kuroshio

Q 13 –The time between the low tide and high tide, when the tide is rising, is called:
(a) drift
(b) flood
(c) ebb
(d) current

Q 14 –Wave speed is the rate at which the wave moves through the water and is measured in
(a) Knots
(b) Miles
(c) Kilometer
(d) Kilogram

Q 15 –How much is the depth of Mariana trench?

(a) 4000 m.
(b) 11033 m.
(c) 7800 m.
(d) 3640 m.

Q 16 –Abyssal plains are located at the depth of

(a) 2000-6000 m.
(b) 3000-6000 m.
(c) 2000-4000 m.
(d) 3000-7000 m.

Q 17 – What are the important mechanisms by which ocean currents are generated?

Q 18 –Name two types of waves.

Q 20 –What are tides?

Q 21 –What is a tidal bore?

Q 22 –Discuss the impact of prevailing winds on the motion of currents.

Q 23 –Why the circulation of currents in the Indian ocean is different from the Atlantic and the Pacific oceans?

Q 24 –Describe the mechanism of origin of sea waves.

Q 25 –Distinguish between progressive and oscillatory waves.

Q 26 –Discuss the properties of waves.

Q 27 –Distinguish between Swell and Surf.

Q 28 –What are the disadvantages of tides?

Q 29 –Why does the temperature of seawater decrease with depth?

Q 30 –How can the velocity of the ocean currents be measured?

Q 31 –Write a short note on the vertical circulation of ocean water.

Q 32 –Describe the currents of the Pacific ocean in brief?

Q 33 –Write a short note on a spring tide and neap tide.

Q 34 –If there were no ocean currents, what would have happened to the world? Discuss.