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  • Question
  • There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.


  • Options
  • A. 0.05
  • B. 1
  • C. 6.5
  • D. 15

  • Correct Answer
  • 6.5 


  • More questions

    • 1. NPK fertiliser is a __________ fertiliser.

    • Options
    • A. complex
    • B. mixed
    • C. nitrogenous
    • D. phosphatic
    • Discuss
    • 2. Pick out the correct statement.

    • Options
    • A. In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity.
    • B. With increase in temperature, the selectivity of the solvent used in solvent extraction decreases.
    • C. The selectivity of solvent used in solvent extraction is unity at the plait point.
    • D. all (a), (b) and (c).
    • Discuss
    • 3. Reducing atmosphere is maintained in a

    • Options
    • A. calcination kiln
    • B. blast furnace
    • C. soaking pit
    • D. L.D. converter
    • Discuss
    • 4. Crude oil is pumped by a __________ pump.

    • Options
    • A. gear
    • B. centrifugal
    • C. screw
    • D. reciprocating
    • Discuss
    • 5. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.

    • Options
    • A. 1
    • B. 5
    • C. 50
    • D. 500
    • Discuss
    • 6. Except for monoatomic gases, the molal heat capacity at constant volume for all gases is __________ Kcal/Kg mole.° K.

    • Options
    • A. 3
    • B. > 3
    • C. < 3
    • D. < 1
    • Discuss
    • 7. The reaction A + B ? C has been conducted in a reactor as shown below.

      The number of balances (material) that can be made around the reactor are

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
    • Discuss
    • 8. In classification, particles are said to be equal settling, if they have the same terminal velocities in the

    • Options
    • A. different fluids
    • B. same fluid
    • C. same field of force
    • D. both (b) and (c)
    • Discuss
    • 9. __________ are used for the separation of coarse particles from a slurry of fine particles.

    • Options
    • A. Thickeners
    • B. Classifiers
    • C. Hydrocyclones
    • D. Decanters
    • Discuss
    • 10. Polymerisation of poly functional monomers produces polymers having

    • Options
    • A. good machanical strength
    • B. low viscosity
    • C. low melting point
    • D. none of these
    • Discuss


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