Physical Geography - Geophysical Phenomena - MCQs with answers - Part I
1. The place of occurrence of an earthquake is calleda. Focus
b. Epicentre
c. Fault
d. None of the above
View Answer / Hide AnswerANSWER: a. Focus
Earthquake refers to the vibration of the earth due to the rapid release of energy. The energy released moves from the focus which is a source point in all the directions in the form of waves.
i. The intensity of an earthquake is greater over rocky areas.
ii. The destruction caused by an earthquake is greater over soft soil regions.
a. i only
b. ii only
c. Both
d. None of the above
View Answer / Hide AnswerANSWER: b. ii only
The intensity and destruction caused by an earthquake is generally greater over soft soil regions. For example, the alluvial soil regions. The intensity of an earthquake is lesser over rocky terrain.
a. Short wavelength
b. High frequency
c. Compression wave
d. All the above
View Answer / Hide AnswerANSWER: d. All the above
There are three major division of the seismic waves. Seismic waves are the pulses of energy generated by earthquakes and they can pass through the entire Earth. The 3 divisions are primary waves, secondary waves and long waves.
a. Earthquakes
b. Volcanoes
c. Continental drift
d. Atmospheric pressure
View Answer / Hide AnswerANSWER: a. Earthquakes
This theory explains the mode and cause of the earthquakes. The Elastic Rebound Theory is given by Harry Fielding Reid. This theory was one of the first satisfactory theory related to earthquakes.
a. Focus
b. Eye
c. Fault
d. Epicentre
View Answer / Hide AnswerANSWER: d. Epicentre
The place of the occurrence of an earthquake or the source point is called as focus. Faults denote weaker zones in the Earth's crust. Epicentre is the place where the seismic event is first experienced.
i. P waves can travel only through solid crust.
ii. The speed of P waves is the highest.
a. i only
b. ii only
c. Both
d. None
View Answer / Hide AnswerANSWER: b. ii only
P waves are longitudinal waves that travel through the solid crust and mantle. They also travel through the liquid part of the Earth's core. Also, the speed of the Primary waves is the highest.
a. P waves
b. S waves
c. L waves
d. P or S waves
View Answer / Hide AnswerANSWER: a. P waves
P waves are compression waves. Because the speed of the primary waves is the highest, P waves reaches the surface of the Earth faster than the secondary waves or the long waves.
i. Secondary waves are also called as distortional waves.
ii. They travel through both solid and liquid part of the core.
a. i only
b. ii only
c. both
d. None
View Answer / Hide AnswerANSWER: a. i only
S waves do not travel through the liquid part of the core. S waves are transverse waves that have short wavelength and high frequency. These waves are also called as distortional waves.
a. Long wavelength
b. Low frequency
c. Confined to skin of the Earth's crust
d. All the above
View Answer / Hide AnswerANSWER: d. All the above
Long waves or the L waves cause structural damages as they are confined to the skin of the earth’s crust. Long waves are also called as long period waves. They have long wavelength and low frequency.
i. L waves have high frequency
ii. L waves cover the shortest distance of all seismic waves.
a. i only
b. ii only
c. Both
d. None
View Answer / Hide AnswerANSWER: d. None
L waves have low frequency and long wavelength. They cover the longest distance than all other seismic waves. Long waves are called long period waves.
