Physical Geography - Geophysical Phenomena - MCQs with answers - Part I

Physical Geography - Geophysical Phenomena - MCQs with answers - Part I

1. The place of occurrence of an earthquake is called

a. Focus
b. Epicentre
c. Fault
d. None of the above

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.

2. Consider the following statements and identify the right ones.

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

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.

3. Which of the following are features of a primary wave?

a. Short wavelength
b. High frequency
c. Compression wave
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.

4. The Elastic Rebound Theory is associated with

a. Earthquakes
b. Volcanoes
c. Continental drift
d. Atmospheric pressure

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.

5. The place which experiences the seismic event first is called

a. Focus
b. Eye
c. Fault
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.

6. Consider the following statements and identify the right ones.

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

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.

7. Which of the following waves reach the surface of the Earth first?

a. P waves
b. S waves
c. L waves
d. P or S 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.

8. Consider the following statements and identify the right ones.

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

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.

9. Which of the following are the features of long waves?

a. Long wavelength
b. Low frequency
c. Confined to skin of the Earth's crust
d. All the above

Long waves or the L waves cause structural damages as they are confined to the skin of the earthâ€™s crust. Long waves are also called as long period waves. They have long wavelength and low frequency.

10. Consider the following statements and identify the right ones.

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