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Civil Engineering :: Elements of Remote Sensing

  1. Which one of the following statements is correct?

  2. A.

    The function of an information system is to improve ones ability to make decisions

    B.

    The information system is the chain of operations

    C.

    A map is a collection of stored, analysed data, its stored information is suitability used in making decisions

    D.

    All the above


  3. The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called:

  4. A.

    passive remote sensing

    B.

    active remote sensing

    C.

    neutral remote sensing

    D.

    None of these


  5. The normal altitude of GPS satellite is about

  6. A.

    16, 200 km

    B.
    20, 200 km
    C.
    24, 400 km
    D.

    36, 100 km


  7. Repetitive observations of the same area at equal interval of time, are useful to monitor the dynamic phenomena :

  8. A.

    Cloud evolution

    B.

    Vegetative cover

    C.

    Snow cover

    D.

    Forest fires

    E.

    All of these


  9. Orbital radius of GPS satellites is approximately:

  10. A.

    15,200 km

    B.

    26,600 km

    C.
    18,400 km
    D.

    36,000 km


  11. Which one of the following statement is incorrect regarding the electromagnetic radiation?

  12. A.

    These are produced by the motion of electric charge

    B.
    The oscillation of charged particles sets up changing electric fields.
    C.

    The changing electric fields induce the changing magnetic fields in the surrounding medium

    D.
    None of these

  13. Consider the following statements regarding the satellite imaging :
    1. The satellite orbit is fixed in the inertial space
    2. During successive across-track imaging, the earth rotates beneath the sensor
    3. The satellite images a skewed area
    Which one of the following statements is/are correct ?

  14. A.

    1, 2, 3

    B.

    1, 3

    C.

    2, 3

    D.

    1, 2


  15. Which one of the following statements is correct?

  16. A.

    π radians equal to 180°.

    B.

    The cone subtended by an area on the sphere at the centre, is called the solid angle.

    C.

    The solid angle is equal to the ratio of the area on the sphere and the square of the radius of the sphere.

    D.

    The unit of the solid angle is steradian (Sr)

    E.

    All of these


  17. If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height

  18. A.

    B.

    C.

    D.

    h = B H dp


  19. In GPS, receivers are used are ;

  20. A.

    electronic clocks

    B.
    atomic clocks
    C.
    quartz clocks
    D.

    mechanical clocks