Earth Science MCQs (Part 15 of 21)
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- The Earth would have one side always facing the sun if the
- Earth went around the sun but did not rotate.
- period of rotation and revolution were equal
- period of rotation was half that of the period of revolution
- period of rotation was twice that of the period of revolution.
- Assuming the altitude of all the continents to be the same, the range of temperature would be greatest at the
- centre of the largest mass at high latitude
- centre of the largest mass at low latitude
- western part of the largest mass in southern hemisphere
- eastern part of the largest mass in northern hemisphere
- Ocean surface currents are mainly caused by
- wind
- tides
- salinity differences
- density differences
- The stress at which rocks begin to strain permanently is the
- yield strength
- ultimate strength
- fracture strength
- tensile strength
- A scientist runs an experiment to test the deformation behaviour of a rock in the atmospheric condition and plots the compressive stress (s) as a function of strain (e) . She finds that
- s a 1⟋e
- s a e
- s a e2
- s a 1⟋e2
- In the Himalayan mountain belt one can find abundant
- normal faults and folds
- thrusts and folds
- strike-slip faults and bending of rock strata
- gravity-induced sag structures
- Natural earthquakes are generated due to
- plastic flow of rocks and release of plastic strain energy
- folding of rock layers
- sudden release of elastic strain energy during fracture propagation
- sudden release of viscous strain accumulated in rocks.
- The Mohorovicic discontinuity below the Himalayan orogen is at a depth greater than that below the Indian Craton. This is because of:
- isostatic mass adjustment
- lateral density variation
- upwelling material below the Indian craton
- less tectonic activity in the Himalayan region.
- P-wave shadow zones recorded by seismologists indicate the boundary between the
- lower and upper crusts
- inner core and outer core
- lower mantle and outer core
- transition zone and lower mantle
- In the mantle, heat flow on long time scales takes place by convection. With increase in the Rayleigh number, the mantle convection would
- stop
- become vigorous
- propagate laterally
- be pulsating