Earth Science MCQs (Part 17 of 21)
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- Which one of these depositional environment will be best for the preservation of fossils?
- Bottom of river.
- Deserts.
- Shallow sea floor.
- Deep sea floor.
- After an earthquake, the epicenter is located by noting at various places
- the difference in the arrival times of S & P waves
- the intensity of the earthquake
- number of buildings damaged
- number of people dead
- The Earth՚s magnetic field has undergone reversals in the past. The present field is named after
- Gauss
- Brunhes
- Olduvai
- Matuyama
- Continental shelves are characterized by gradients in the range of
- 1: 1000 to 1: 1500
- 1: 30 to 1: 40
- 1: 20 to 1: 30
- 1: 60 to 1: 200
- The epicenter of a deep focus earthquake is located
- on the earth՚s surface
- below a depth of 70 km
- between 70 − 300 km
- below 300 km.
- Read the following statements and pick out the correct option.
- Statement 1: I: Isostatically over-compensated mountainous regions are associated with a thicker crust.
- Statement 2: II: Isostatically under compensated mountainous regions are associated with a thinner crust.
- Statements I and II are correct
- Statement 1 is true, but II is false
- Statement 1 is false, but II is true
- Statements I and II are false.
- A fall in bore-level or sea-level is not responsible for an increase in
- channel length
- channel head
- channel slope
- channel sinuosity
- In the Earth, brittle rocks become more and more ductile with increasing depth. If so, frequently occurring earthquakes are likely to have their focus at:
- deeper levels
- shallow levels
- core-mantle boundary
- transition zone
- In extensional tectonic regimes of the Earth we commonly observe
- normal faults
- thrusts
- vertical faults
- reverse faults
- The effective shear stress on a frictional plane will be a maximum when the plane is inclined to the compression direction at an angle of:
- 90°
- More than 45°
- Less than 45°
- 45°