Earth Science MCQs (Part 16 of 21)

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  1. In a narrow channel, water is flowing in a laminar manner. The flow will turn turbulent if

    1. the Reynolds number exceeds a critical number

    2. the viscosity of water increases

    3. the Rayleigh number decreases down to a critical value

    4. the Reynolds number drops below a critical value

  2. A small pebble is dropped into the deep sea from a floating glacier mass. The pebble falls down, and is then likely to hit the sea bottom with

    1. an accelerating velocity

    2. a decelerating velocity

    3. a uniform velocity

    4. a pulsating velocity

  3. The landmasses overlain by thick glacier masses slowly move up following the phase of deglaciation. This indicates that the Earth's interior is

    1. perfectly elastic

    2. perfectly plastic

    3. visco-elastic

    4. Newtonian

  4. In the Earth's crust the radioactive element Rb is likely to concentrate preferentially in

    1. K-feldspar

    2. quartz

    3. Ca-feldspar

    4. olivine

  5. A mineral with monoclinic crystal symmetry is observed under ab optical microscope. The observations indicate that the mineral is optically

    1. bi-axial

    2. uni-axial

    3. isotropic

    4. tri-axial

  6. Crustal rocks below the Atlantic ocean are dated systematically across the midoceanic ridge. The maximum of age of the rocks is:

    1. > 200 Ma

    2. = 50 Ma

    3. < 200 Ma

    4. < 100 Ma

  7. A scientist measured the shear stress and shear rates in a magma flowing out of an active volcano, and prepared the following graph The magma is:

    1. Newtonian

    2. Non-Newtonian

    3. Plastic

    4. Bingham

  8. The temperature at the centre of the Earth is estimated to be:

    1. < 3000oC

    2. > 4000oC

    3. > 1000oC

    4. 2000oC

  9. What is the rationale central to the following processes, e. g. rusting of iron, conversion of graphite to diamond within the earth, and NaCl dissolving in water?

    1. The presence of fluid.

    2. All reactions involve volume increase.

    3. Free energy becomes more negative.

    4. No change in volume.

  10. Permanent ice sheet over Antarctica developed in a early Cenozoic as a result of

    1. intense glaciation over the earth

    2. separation of Antarctica from other continents leading to its thermal isolation

    3. Complete stoppage of solar radiation

    4. Extensive volcanism on earth

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