Remote Sensing Objective Questions and Answers - Set 03

Practice Test: Question Set - 03

1. Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects:
    (A) Electric waves
    (B) Sound waves
    (C) Electromagnetic waves
    (D) Wind waves

2. A reduction of nitrogen nutrient in plants:
    (A) Affects leaf color
    (B) Reduces pigment concentration
    (C) Increase the visible reflectivity
    (D) All of these

3. 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

4. The altitudinal distance of a geostationary satellite from the earth is about:
    (A) 26,000 km
    (B) 30,000 km
    (C) 36,000 km
    (D) 44,000 km

5. The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called:
    (A) Reflectance
    (B) Reflectance factor
    (C) Albedo
    (D) None of these

6. Due to scan geometry of a satellite sensor:
    (A) The off-nadir resolution is degraded
    (B) The ground distance swept by the senor, IFOV is proportional to sec2θ, where θ is the angle of scan measured from the nadir
    (C) The details towards the edge of the scan get compressed
    (D) All of these

7. Which one of the following statement is correct?
    (A) Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation
    (B) The rate of transfer of radiant energy is called flux and is expressed in watts
    (C) The radiant energy which falls upon a surface is termed as irradiance
    (D) All of these

8. Which one of the following parameters is accurate for DGPS?
    (A) Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
    (B) Positional accuracies ~ 2 - 5 m if rover is less than 2-5 km from the reference station
    (C) Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station
    (D) Positional accuracies ~ 5 - 10 m if rover is less than 25 km

9. Pick up the correct statement from the following:
    (A) The surface defined by the locus of points having same phase, is called a wave front
    (B) The wave whose surface of constant phase are parallel planes, is known as a plane wave
    (C) The relative phase difference between the waves is important and not the absolute phase of a point on the wave
    (D) All of these

10. Which one of the following statements is correct?
    (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) All of these

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