Earth Science MCQs (Part 17 of 21)

  1. Which one of these depositional environment will be best for the preservation of fossils?

    1. Bottom of river.

    2. Deserts.

    3. Shallow sea floor.

    4. Deep sea floor.

  2. After an earthquake, the epicenter is located by noting at various places

    1. the difference in the arrival times of S & P waves

    2. the intensity of the earthquake

    3. number of buildings damaged

    4. number of people dead

  3. The Earth's magnetic field has undergone reversals in the past. The present field is named after

    1. Gauss

    2. Brunhes

    3. Olduvai

    4. Matuyama

  4. Continental shelves are characterized by gradients in the range of

    1. 1: 1000 to 1: 1500

    2. 1: 30 to 1: 40

    3. 1: 20 to 1: 30

    4. 1: 60 to 1: 200

  5. The epicenter of a deep focus earthquake is located

    1. on the earth's surface

    2. below a depth of 70 km

    3. between 70 − 300 km

    4. below 300 km.

  6. 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.
    1. Statements I and II are correct

    2. Statement 1 is true, but II is false

    3. Statement 1 is false, but II is true

    4. Statements I and II are false.

  7. A fall in bore-level or sea-level is not responsible for an increase in

    1. channel length

    2. channel head

    3. channel slope

    4. channel sinuosity

  8. 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:

    1. deeper levels

    2. shallow levels

    3. core-mantle boundary

    4. transition zone

  9. In extensional tectonic regimes of the Earth we commonly observe

    1. normal faults

    2. thrusts

    3. vertical faults

    4. reverse faults

  10. 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:

    1. 90°

    2. More than 45°

    3. Less than 45°

    4. 45°