Questions and answers for exam Preparation

MCQs

Total Questions : 687 | Page 68 of 69 pages

Question 671. If electric permittivity and magnetic permeability of the medium are respectively and , then the velocity (Cm) of the electromagnetic wave in the medium is given by___________________?

Cm = 1/εμ
Cm = 1/√8 μ
Cm = 5/√εμ
None of these

Discuss Question

Answer: Option B. -> Cm = 1/√8 μ
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 672. Spatial variation in horizontal and vertical directions is caused due to_________________?

Physical weathering of rocks
Chemical weathering of rocks
Biological weathering of rocks
All of these

Discuss Question

Answer: Option D. -> All of these
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 673. The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target_________________?

Reduces the contrast of the image and also its sharpness
Increases the contrast of the image but reduces the sharpness
Increases both the contrast and sharpness
Reduces the contrast but increases the sharpness

Discuss Question

Answer: Option A. -> Reduces the contrast of the image and also its sharpness
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 674. “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___________________?

Fresnel reflection
Fresnel refraction
Snell’s law
None of these

Discuss Question

Answer: Option A. -> Fresnel reflection
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 675. The basic requirement of any sensor system is___________________?

Radiometric resolution
Spatial resolution
Spectral resolution
All of these

Discuss Question

Answer: Option D. -> All of these
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 676. A passive sensor uses ________________?

Sun as the source of energy
Flash light as a source of energ
Its own source of energy
None of these

Discuss Question

Answer: Option A. -> Sun as the source of energy
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 677. The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called________________?

Sensors
Passive sensors
Active sensors
None of these

Discuss Question

Answer: Option C. -> Active sensors
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 678. Who coined the term, ‘Remote sensing_______________?

Evelyn L. Pruitt, a geographer
Gaspard Felix Tournachon, a French scientist
Wilbur Wright, an Italian scientist
None of these

Discuss Question

Answer: Option A. -> Evelyn L. Pruitt, a geographer
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 679. The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as__________________?