Engineering Geology Multiple Choice Questions on “Works of Sea”.
1. The gently sloping land part that remains partly submerged under seawater is __________
a) Continental shelf
b) Continental bench
c) Beach
d) Continental slope
Answer: a
Clarification: Continental shelf is the gently sloping land part that remains partly submerged under seawater. It may be only a narrow strip or quite an extensive area stretching for hundreds of kilometres.
2. The slope starting from the farthest end of the continental shelf and continuing up to sea floor is __________
a) Continental belt
b) Continental bench
c) Beach
d) Continental slope
Answer: d
Clarification: Continental slope is the slope starting from the farthest end of the continental shelf and continuing up to sea floor. It may be gentle or very steep in gradient varying between 1 in 4 to 1 in 6.
3. The type of waves that are characteristic of deeper portions of the sea?
a) Oscillatory waves
b) Translatory waves
c) Littoral waves
d) Lateral waves
Answer: a
Clarification: Oscillatory waves are characteristic of deeper portions of the sea. In such waves, each particle moves in a circular orbit.
4. The type of waves that are characteristic of shallower portions of the sea?
a) Oscillatory waves
b) Translatory waves
c) Littoral waves
d) Lateral waves
Answer: b
Clarification: Translatory waves are typically of shallower depths in the sea and abound along the seashore. They are commonly produced after the oscillatory waves break and rush forward.
5. Bodies of seawater of considerable volume moving along and parallel to the shore are called __________
a) Oscillatory waves
b) Translatory waves
c) Littoral currents
d) Lateral currents
Answer: c
Clarification: Littoral currents are the bodies of seawater of considerable volume moving along and parallel to the shore.
6. The bodies of seawater moving backwards to sea after having reached and struck the seashore are called __________
a) Oscillatory waves
b) Translatory waves
c) Littoral currents
d) Rip currents
Answer: d
Clarification: Rip currents are bodies of seawater moving backwards to sea after having reached and struck the seashore. They often move below the surface of the sea and reach varying distance up to the middle to the sea.
7. Charles Darwin classified coral reefs into how many classes?
a) 2
b) 3
c) 4
d) 5
Answer: b
Clarification: Charles Darwin, who was the first to study and classify the reef deposits recognized the following three types: fringing reefs, barrier reefs and atolls.
8. Peculiar type of ridge-like marine deposits that have been formed due to accumulation of dead parts of certain of sea-organisms are called __________
a) Limestone
b) Coral reefs
c) Pearl
d) Gorges
Answer: b
Clarification: Coral reefs are peculiar types of ridge-like marine deposits that have been formed due to accumulation of dead parts of certain of sea-organisms.
9. The type of reefs that occur from a distance of shore and have flat-topped ridges are __________
a) Fringing reefs
b) Barrier reefs
c) Atolls
d) Deposited reefs
Answer: b
Clarification: The barrier reefs are the most common type of reefs and occur at a distance from the shore or the island running in the form of parallel, flat-topped ridges.
10. Type of reef with an annular, circular or semi-circular coral reef surrounding a lagoon is called __________
a) Fringing reefs
b) Barrier reefs
c) Atolls
d) Deposited reefs
Answer: c
Clarification: An atoll is essentially an annular, circular or semi-circular coral reef surrounding a central body of water that is as usual called a lagoon. In a typical atoll, the ring made of coral deposits may be continuous or discontinuous, more often broken at places.