# Surveying Questions and Answers – Remote Sensing – Basic Principles

This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “Remote Sensing – Basic Principles”.

1. The relation between velocity, wavelength and frequency can be given as _________
a) λ = c / r
b) λ = c / f
c) λ = c / h
d) λ = h*c / f

Explanation: Photons are the main constituent particles in the electromagnetic energy. The relation between velocity, wavelength and frequency is determined as λ = c / f, where λ represents wavelength, f is the frequency of the wave and c represents the velocity of the wave, which is equal to speed of light.

2. Remote sensing uses which of the following waves in its procedure?
a) Electric field
b) Sonar waves
c) Gamma- rays
d) Electro-magnetic waves

Explanation: Electro-magnetic waves are used in case of remote sensing. The different waves present in this spectrum enables us to use a variety of waves based on the condition present and can be able have a better output.

3. Which of the following is not a principle of remote sensing?
a) Interaction of energy with satellite
b) Electromagnetic energy
c) Electro-magnetic spectrum
d) Interaction of energy with atmosphere

Explanation: Remote sensing involves certain principles which are applied for having a good result of the desired output. The principles are electromagnetic energy, electro-magnetic spectrum, interaction of energy with atmosphere etc.

4. Which among the following waves is having less wavelength range?
a) 0.03mm
b) 0.03nm
c) 0.03m
d) 0.03km

Explanation: A wide range of waves are present in case of electromagnetic spectrum, off which the gamma-rays are having a nano level wave length capacity i.e., less than 0.03nm.

5. In visible region, the blue light is having a wave length range of __________
a) 0.42-0.52 micrometer
b) 0.24-0.52 micrometer
c) 0.42-0.92 micrometer
d) 0.22-0.32 micrometer

Explanation: Visible region consist of three color waves red, blue and green remaining are the combination of those. The blue light is having a wavelength range of 0.42-0.52 micrometer.
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6. Which of the following field is used by the EM waves?
a) Solar field
b) Polarized field
c) Electric field
d) Micro field

Explanation: EM waves used two major sources of fields i.e., electric and magnetic fields. Both are placed orthogonal to each other in a wave pattern. The electric components are placed in vertical manner and magnetic components in horizontal manner.

7. Among the following, which describes Stefan- Boltzmann formula?
a) M = σ/T4
b) M = σ-T4
c) M = σ+T4
d) M = σ*T4

Explanation: Stefan- Boltzmann law is based on the radiation produced and emitted by the body. This can be mathematically represented by M = σ*T4. Here, α is the Stefan- Boltzmann constant, T is the absolute temperature, M is the spectral existence of the body.

8. Which of the following is not a classification of scattering principle?
b) Rayleigh scattering
c) Mie scattering
d) Non-selective scattering

Explanation: Scattering involves in distribution of the light ray in more than two directions. It can be further classified as Rayleigh scattering, Mie scattering, non-selective scattering.

9. Which of the following can act as an example for air-borne platform?
a) LISS-III
b) Dakota
c) MOS
d) LISS-II

Explanation: At present, the air-borne platforms in use are Dakota, AVRO and beach-craft. A sensor is mounted on them and is placed at an altitude which can be able to access the specified object.

10. Polar orbiting satellites are generally placed at an altitude range of __________
a) 7-15km
b) 7000-15000km
c) 700-1500km
d) 70-150km

Explanation: Polar orbiting satellites are also known as sun-synchronous satellites, which are generally placed at an altitude range of 700-1500km from the ground level. These are able to deliver accurate information about the object which we need access to.

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