Test: Water (Oceans)

QUESTION: 1

A major portion of sea level is found at:

A.
10-12 kms below sea level
B.
6-9 kms below sea level
C.
3-6 kms below sea level
D.
1-2 kms below sea level

Solution:

Ocean floor has varied and complex features.

QUESTION: 2

Along the coasts, salinity is:

A.
Lowered
B.
Increased
C.
Stable
D.
Unaffected

Solution:

Surface salinity is lowered in coastal regions because of the inflow of fresh water from rivers.

QUESTION: 3

Salinity refers to the total amount of

A.
sediments in the water.
B.
impurities present in the water.
C.
salt present in the water.
D.
heat present in the water.

Solution:

Salinity is the saltiness or dissolved salt content of a body of water. It is a general term that is used to describe the levels of different salts, such as sodium chloride, magnesium and calcium sulfates and bicarbonates.

QUESTION: 4

The relief feature of oceanic floor shown in the given picture is

A.
atoll.
B.
guyots.
C.
trench.
D.
submarine canyon.

Solution:

Submarine canyons have been found carving deep cracks that extend from near shore to deep sea edge of the oceanic shelf.

QUESTION: 5

The salinity increases with depth and there is a distinct zone called

A.
isohaline.
B.
halocline.
C.
salocline.
D.
thermocline.

Solution:

Salinity, generally, increases with depth and there is a distinct zone called the halocline, where salinity increases sharply. Other factors being constant, increasing salinity of seawater causes its density to increase.

QUESTION: 6

A mid-ocean ridge is an underwater mountain system formed by

A.
plate tectonics.
B.
earthquake.
C.
ocean currents.
D.
submarine landslides.

Solution:

A mid-ocean ridge is an underwater mountain system formed by plate tectonics and consequently is termed a divergent plate boundary.

QUESTION: 7

The factor affecting the distribution of temperature of ocean water is

A.
evaporation.
B.
precipitation.
C.
hydration.
D.
ocean currents.

Solution:

The factor affecting the distribution of temperature of ocean water is latitude, unequal distribution of land and water,prevailing winds ocean currents.

QUESTION: 8

The Coral reefs are a major characteristic of:

A.
Indian Ocean
B.
Pacific Ocean
C.
Atlantic Ocean
D.
Mediterranean Sea

Solution:

The Pacific Ocean has the most coral reefs amongst all the oceans. There are about twice as many coral species in Pacific Ocean reefs as in Atlantic Ocean reefs.

QUESTION: 9

Which one of the following is the smallest ocean: