# Practice Test: Question Set - 09

1. The maximum sun's radiation occurs around:
(A) 0.4 μm wave length
(B) 0.55 μ wave length
(C) 0.7 μ wave length
(D) None of these

2. Orbital radius of GPS satellites is approximately:
(A) 15,200 km
(B) 26,600 km
(C) 18,400 km
(D) 36,000 km

3. If electric permittivity and magnetic permeability of the medium are respectively ‘ε’ and ‘μ’, then the velocity (Cm) of the electromagnetic wave in the medium is given by:
(A) Cm = 1/εμ
(B) Cm = 1/√8 μ
(C) Cm = 5/√εμ
(D) None of these

4. 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

5. Pick up the correct statement from the following
(A) The ratio of the up flux and down flux just above the snow surface, is called albedo
(B) Spectral albedo of snow is calculated for the semi-infinite snow thickness
(C) Water equivalent height of snow is the height of water column obtained by melting snow
(D) All of these

6. Spatial variation in horizontal and vertical directions is caused due to:
(A) Physical weathering of rocks
(B) Chemical weathering of rocks
(C) Biological weathering of rocks
(D) All of these

7. The basic requirement of any sensor system is:
(B) Spatial resolution
(C) Spectral resolution
(D) All of these

8. The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths:
(A) 0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 μm
(B) 2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 μm
(C) 4.2 to 5.0, 7.0 to 15.0 μm and 1 cm to 30 cm
(D) All of these

9. "An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as:
(A) Fresnel reflection
(B) Fresnel refraction
(C) Snell's law
(D) None of these

10. Pick up the correct statement from the following:
(A) Permeability is a measure of conducting the magnetic lines of force in the material
(B) Permeability is a measure of the extent to which magnetic lines of force can penetrate a medium
(C) Permeability is expressed as the ratio of the magnetic flux density (B) to the field strength of the magnetizing field
(D) All of these

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