Earth Science MCQs (Part 14 of 21)

  1. When moisture-laden winds are blocked by a mountain chain, intense rainfall happens as in the Western Ghat and Himalayan regions-the Orographic effect. In such cases which one of the following factors is dominantly responsible for intense precipitation?

    1. Mountain heights

    2. Mountain orientation with respect to wind direction

    3. Ascent induced by latent heat of condensation of water vapour

    4. Vegetation on the mountain slopes.

  2. By which one of the following decay schemes does the decay of 40K? 40Ar take place?

    1. emission of a-particles

    2. electron capture by 40K nucleus

    3. emission of β--particles

    4. emission of β ± particles

  3. Quantitative chemical analysis of a rock revealed its MgO content to be 10.0 wt. %. If the atomic weight of Mg and O are 24 and 16 respectively, then how much is the Mg content of the rock?

    1. 6.0 wt. %

    2. 16.0 wt. %

    3. 10 wt. %

    4. 24 wt. %

  4. During storms, thatched roofs of huts are lifted and are carried away by wind. The basic principle that governs the process is

    1. Bernoulli's principle

    2. Coriolis force

    3. Pascal's law

    4. Archimedes principle

  5. A geostationary satellite orbiting at an attitude of 36, 000 km has a period of 24 hours. What is the orbital period of a satellite orbiting at an altitude of 1000 km (take the radius of the Earth as ~6000 km)

    1. 4/v6 hr

    2. ⅔ hr

    3. 3/2 hr

    4. ⅑ hr

  6. Age of the earth is estimated to be about 4.5 billion years based on isotopes, such as 238U, whose half life is about 4.5 billion years. If the half-life of 238U were 9.0 billion years, then the age of the Earth would be

    1. 4.5 billion years

    2. 9.0 billion years

    3. 4.5 − 9.0 years

    4. 9.0 − 4.5 years

  7. Assuming that the earth's atmosphere is made of 80% N2 and 20% O2 by volume, what is the ratio of their partial pressures (partial pressure is based on molecular weight)?

    1. 7: 2

    2. 4: 1

    3. 1: 4

    4. 2: 7

  8. Moon's gravity is about ⅙ of that on earth. What is the period of a seconds pendulum on the Moon (Neglect thermal contraction/expansion)?

    1. 2v6 sec.

    2. 2v3 sec.

    3. 2 sec.

    4. 1 sec.

  9. In the rain shadow area (leeward side of a mountain), the air mass is characterized by

    1. warm and stable conditions

    2. warm and unstable conditions

    3. cold and stable conditions

    4. cold and unstable conditions

  10. Which of the following soil properties determines the rate at which water can pass through porous material?

    1. Porosity

    2. Permeability

    3. Capillarity

    4. Infiltration

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