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  • Question

  • In the derivation of Thiem's formula In the derivation of Thiem's formula , the following assumption is not applicable The aquifer is hom, the following assumption is not applicable


  • Options
  • A. The aquifer is homogeneous and isotropic
  • B. Flow lines are radial and horizontal
  • C. The slope of the water surface is too small
  • D. The well has been sunk up to the surface of the unconfined aquifer
  • E. None of these.

  • Correct Answer
  • The well has been sunk up to the surface of the unconfined aquifer 

    • More questions

    • 1. For the design of major hydraulic structures on the canals, the method generally preferred to, is based on

    • Options
    • A. Bligh's theory
    • B. Electrical analogy method
    • C. The relaxation method
    • D. Khosla's method of independent variables.
      • Discuss
    • 2. The length of runway is increased per 300 m rise above M.S.L.

    • Options
    • A. 3%
    • B. 4%
    • C. 5%
    • D. 6%
    • E. 7%
      • Discuss
    • 3. In sewers the velocity of flow should not be

    • Options
    • A. more than the self-cleansing velocity
    • B. less than the self-cleansing velocity
    • C. less than 10 m/sec
    • D. more than 20 m/sec.
      • Discuss
    • 4. If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water at T°C, according to Stoke's law, is

    • Options
    • A.
    • B.
    • C.
    • D.
    • E. none of these.
      • Discuss
    • 5. Pick up the correct statement from the following:

    • Options
    • A. A wire wound in spiral form, is called a helical spring
    • B. The pitch of a close coil spring, is very small
    • C. The angle made by the coil with horizontal, is called the angle of helix
    • D. In the open coil helical spring, the angle of helix is comparatively large
    • E. All the above.
      • Discuss
    • 6. Side slopes generally kept for canals in loam soil, are :

    • Options
    • A. 1 : 1 in cutting and : 1 in filling
    • B. : 1 in cutting and 2 : 1 in filling
    • C. Neither (a) nor (b)
    • D. Both (a) and (b)
      • Discuss
    • 7. Pick up the correct statement from the following:

    • Options
    • A. Duty of canal water is defined as the total area irrigated by the discharge averaging one unit during the base period of the duty
    • B. Duty of canal water is usually calculated at the head discharge of a channel
    • C. Duty of canal water at the head of a channel and at the outlet of a distributary, differ considerably due to progressive losses of water
    • D. Duty of canal water at the outlet of a distributary, is generally known as outlet factor or outlet discharge factor
    • E. All the above.
      • Discuss
    • 8. The damp proof course (D.P.C.) is measured in

    • Options
    • A. Cub.m
    • B. Sq m
    • C. Metres
    • D. None of these
      • Discuss
    • 9. The top of the capillary zone

    • Options
    • A. lies below the water table at every point
    • B. lies above the water table at every point
    • C. coincides the water table at every point
    • D. none of these.
      • Discuss
    • 10. The void ratio of a soil sample decreases from 1.50 to 1.25 when the pressure is increased from 25 tonnes/m2 to 50 tonnes/m2, the coefficient of compressibility is

    • Options
    • A. 0.01
    • B. 0.02
    • C. 0.05
    • D. 0.001
      • Discuss

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