Critical angle of electromagnetic radiation takes place if__________________?

Related Mcqs:

1. In case of reflection and refraction of electromagnetic radiation ?

   A. Angle of incidence = angle of refraction
   B. Angle of incidence = angle of reflection
   C. Angle of refraction = sum of the angles of incidence and refraction
   D. All the above

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

   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

3. The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called________________?

   A. Sensors
   B. Passive sensors
   C. Active sensors
   D. None of these

4. The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as__________________?

   A. Ozone hole

   B. Atmospheric window

   C. Ozone window

   D. Black hole

5. 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____________________?

   A. Passive remote sensing
   B. Active remote sensing
   C. Neutral remote sensing
   D. None of these

6. Coherence of two electromagnetic waves takes place if their phase difference is_________________?

   A. Constant in time
   B. Constant in space
   C. Constant in time and space
   D. None of these

7. The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target_________________?

   A. Reduces the contrast of the image and also its sharpness
   B. Increases the contrast of the image but reduces the sharpness
   C. Increases both the contrast and sharpness
   D. Reduces the contrast but increases the sharpness

8. Electromagnetic spectrum contains________________?

   A. Gamma rays (wave length < 10-10 m)
   B. Ultraviolet rays (wave length < 10-6 m)
   C. Infrared rays (wave length < 10 -4 m)
   D. All of these

9. The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from__________________?

   A. 10-10 to 106 m

   B. 10-8 to 106 m

   C. 10-10 to 1010 m

   D. 10-8 to 108 m

10. Electromagnetic radiation_______________?

    A. Produces a time varying magnetic field and vice versa
    B. Once generated, remains self-propagating
    C. Is capable to travel across space
    D. All of these