Elements of Remote Sensing Most Important MCQs

1 - “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

---

Fresnel reflection

2 - A and B are two towers of equal height diametrically opposite on either side of the nadir point, at 3 km and 5 km distances. Which one of the following statements is correct?

---

A. Height displacement of A will be less than that of B

---

B. Height displacement of B will be less than that of A

---

C. Height displacement of A and B is equal

---

D. Height displacement of A and B will be towards each other

---

Height displacement of A will be less than that of B

3 - A passive sensor uses ________________?

---

A. Sun as the source of energy

---

B. Flash light as a source of energ

---

C. Its own source of energy

---

D. None of these

---

Sun as the source of energy

4 - A reduction of nitrogen nutrient in plants_______________?

---

A. Affects leaf colour

---

B. Reduces pigment concentration

---

C. Increase the visible reflectivity

---

D. All of these

---

All of these

5 - Critical angle of electromagnetic radiation takes place if__________________?

---

A. Angle of incidence is equal to angle of refraction

---

B. Angle of incidence is greater than the angle of refraction

---

C. Angle of incidence is equal to 90°

---

D. Angle of refraction is equal to 90°

---

Angle of refraction is equal to 90°

6 - DGPS is based on the concept that bias errors in the position of locations in a given local area, are same if their distances are within___________________?

---

A. 25 km

---

B. 50 km

---

C. 75 km

---

D. 100 km

---

100 km

7 - Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its_______________________?

---

A. Six ground stations

---

B. Five ground stations

---

C. Four ground stations

---

D. Three ground stations

---

Five ground stations

8 - Earth observations from a satellite platform provide____________?

---

A. Synoptic view of a large area

---

B. Constant solar zenith angles and similar illumination conditions

---

C. Repetitive observations of the same area with intervals of a few minutes to a few weeks

---

D. All of these

---

All of these

9 - Economical depth of a plate girder corresponds to_________________?

---

A. minimum weight

---

B. minimum depth

---

C. maximum weight

---

D. minimum thickness of web

---

minimum weight

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

---

All of these

11 - 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

---

All of these

12 - For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is_____________?

---

A. 130 km

---

B. 230 km

---

C. 250 km

---

D. 500 km

---

230 km

13 - For interpolation of satellite data used for monitoring dynamic changes that occurs on the earth surface, the most suitable orbit for the satellite is______________?

---

A. Circular orbit

---

B. Sun-synchronous orbit

---

C. Near polar orbit

---

D. None of these

---

Sun-synchronous orbit

14 - Formation of snow occurs if the cloud temperature is________________?

---

A. Just above the freezing point

---

B. At the freezing point

---

C. Below the freezing point

---

D. None of these

---

Below the freezing point

15 - Geodimeter is based on_________________?

---

A. Propagation of modulated light waves

---

B. Propagation of infrared radiation

---

C. The visible light as carrier with frequency of the order of 5 × 1014 Hz

---

D. High frequency radio waves

---

Propagation of modulated light waves

16 - Horizontal stiffener in a plate girder is provided to safeguard against_______________?

---

A. shear buckling of web plate

---

B. compression buckling of web plate

---

C. yielding

---

D. all of the above

---

compression buckling of web plate

17 - 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___________________?

---

A. Cm = 1/

---

B. Cm

---

C. Cm

---

D. None of these

---

Cm

18 - If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height___________________?

---

A. h = dp/(B/H)

---

B. h = (B/H) dp

---

C. h = dp/(H/B)

---

D. h = (H/B) dp

---

h = dp/(B/H)

19 - If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be______________?

---

A. 40mm

---

B. 60mm

---

C. 80mm

---

D. 100mm

---

60mm

20 - In GPS, receivers used are___________________?

---

A. Electronic clocks

---

B. Atomic clocks

---

C. Quartz clocks

---

D. Mechanical clocks

---

Quartz clocks

21 - Intermediate vertical stiffeners in a plate girder need be provided if the depth of web exceeds___________________?

---

A. 501

---

B. 851

---

C. 200 t

---

D. 2501

---

851

22 - Lacing bars in a steel column should be designed to resist_________________?

---

A. bending moment due to 2.5% of the column load

---

B. shear force due to 2.5% of the column load

---

C. 2.5% of the column load

---

D. both (A) and (B)

---

shear force due to 2.5% of the column load

23 - Leaf reflectance depends primarily on______________?

---

A. The pigments

---

B. Internal cell structur

---

C. Equivalent water content

---

D. All of these

---

All of these

24 - Minimum spacing of vertical stiffeners is limited to________________?

---

A. d/4

---

B. d/3

---

C. d/2

---

D. 2d/3

---

d/3

25 - Orbital radius of GPS satellites is approximately ___________________?

---

A. 15,200 km

---

B. 26,600 km

---

C. 18,400 km

---

D. 36,000 km

---

26,600 km

26 - Pick up the correct definition from the following with response to GIS_______________?

---

A. Common boundary between two areas of a locality is known as adjacency

---

B. The area features which are wholly contained within another area feature, is known so containment

---

C. The geometric property which describes the linkage between line features is defined as connectivity

---

D. All of these

---

All of these

27 - Pick up the correct statement from the following ?

---

A. The refractive index of a medium varies according to the wavelength of the radiation,

---

B. The variation of the refractive index with wave length, is called dispersion,

---

C. The splitting of colours of white light by passing through a prism is caused due to dispersion

---

D. All of these

---

All of these

28 - Pick up the correct statement from the following ?

---

A. For the same feature, the photograph taken from the satellite vertically above the aircraft, the height displacement is lesser than the aerial photograph

---

B. The scale of the aerial photograph depends upon the scale of the topography

---

C. The feature at the principal point has no height displacement

---

D. All of the above

---

All of the above

29 - Pick up the correct statement from the following ?

---

A. Indian space effort started in 1962 with the establishment of a rocket

---

B. Development of space (DOS) was established by the Government of India in 1972

---

C. Indian Space Research Organisation (ISRO) is responsible for the space technology and its application to various activities

---

D. All of these

---

All of these

30 - Pick up the correct statement from the following ?

---

A. In remote sensing technique, the observation place, is called a platform

---

B. Platforms may be either stationary or mobile

---

C. Spatial resolution of the imaging system becomes poorer with increase of platform height

---

D. All of these

---

All of these

31 - Pick up the correct statement from the following ?

---

A. Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system

---

B. Topological characteristics of an object are independent of scale measurement

---

C. The three elements of topology are adjacency, containment, and connectivity

---

D. All of these

---

All of these

32 - Pick up the correct statement from the following?

---

A. Frequency is the number of wave crests passing a fixed point in one second

---

B. Frequency of a wave is measured in Hertz (Hz)

---

C. Amplitude of a wave is the height of its crust from the mid-point

---

D. All of these

---

All of these

33 - Pick up the correct statement from the following_________________?

---

A. When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed

---

B. When the electric vector is in the plane of incidence, vertical polarisation is formed

---

C. When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed

---

D. All of these

---

All of these

34 - Pick up the important characteristic of a target which facilitates its identification from the following ?

---

A. Spectral variation

---

B. Spatial variation

---

C. Temporal variation

---

D. All of these

---

All of these

35 - 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

---

All of these

36 - The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called_________________?

---

A. Spectral variation

---

B. Spatial variation

---

C. Temporal variation

---

D. None of these

---

Spatial variation

37 - The basic requirement of any sensor system is___________________?

---

A. Radiometric resolution

---

B. Spatial resolution

---

C. Spectral resolution

---

D. All of these

---

All of these

38 - The changes in the reflectivity/emissivity with time, is called ?

---

A. Spectral variation

---

B. Spatial variation

---

C. Temporal variation

---

D. None of these

---

Temporal variation

39 - The code based GPS receivers are generally used for_________________?

---

A. Vehicle tracking

---

B. Land navigation

---

C. Trans movement

---

D. All of these

---

All of these

40 - The forces acting on the web splice of a plate girder are__________________?

---

A. axial forces

---

B. shear and axial forces

---

C. shear and bending forces

---

D. axial and bending forces

---

shear and bending forces

41 - The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is_______________?

---

A. 8

---

B. 12

---

C. 16

---

D. 24

---

24

42 - The most widely used antenna in GPS is_______________?

---

A. Parabolic antenna

---

B. Microstrip antenna

---

C. Horn antenna

---

D. Slotted antenna

---

Microstrip antenna

43 - The normal altitude of GPS satellite is about________________?

---

A. 16,200 km

---

B. 20,200 km

---

C. 24,400 km

---

D. 36,100 km

---

20,200 km

44 - The overlap of batten plates with the main members in welded connections should be more than____________________?

---

A. 3t

---

B. 4t

---

C. 6t

---

D. 8t where t = thickness of the batten plate

---

4t

45 - 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

---

Reduces the contrast of the image and also its sharpness

46 - 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

---

Albedo

47 - The reflection of solar energy is characterised by the water content in the leaf, in the reflective optical infrared______________?

---

A. Visible (0.4 –

---

B. Near-IR (0.7 –

---

C. Short wave-IR (1.3 –

---

D. None of these

---

Short wave-IR (1.3 –

48 - The value of energy quantum for radiation of any frequency is proportional to________________?

---

A. The frequency

---

B. The reciprocal of the energy

---

C. The square of the frequency

---

D. The square root of the frequency

---

The frequency

49 - The web crippling due to excessive bearing stress can be avoided by_________________?

---

A. increasing the web thickness

---

B. providing suitable stiffeners

---

C. increasing the length of the bearing plates

---

D. none of the above

---

increasing the length of the bearing plates

50 - Which one of the following attributes is not associated with digital maps_______________?

---

A. Colour

---

B. Symbology

---

C. Legends

---

D. South arrow

---

South arrow

51 - Which one of the following errors is produced by platform characteristics of the sensor ?

---

A. Altitude variation

---

B. Altitude

---

C. Orbit drift

---

D. All of these

---

All of these

52 - Which one of the following frequency regions is a part of sun's radiation ?

---

A. Ultraviolet frequency region

---

B. Infrared frequency region

---

C. Radio frequency region

---

D. All of these

---

All of these

53 - Which one of the following geometric errors of satellite sensors is random ?

---

A. Scan skew

---

B. Panoramic distortion

---

C. Earth rotation

---

D. Altitude variation

---

Altitude variation

54 - Which one of the following helps to identify the objects on the earth surface ?

---

A. Atmospheric window

---

B. Signature

---

C. Radiometric error

---

D. None of these

---

Signature

55 - Which one of the following quantities forms the basis of radiometry ?

---

A. Radiant energy (Q)

---

B. Radiant flux (Φe )

---

C. Radiant intensity (I)

---

D. All of these

---

All of these

56 - Which one of the following residual biases involves the GPS accuracy ?

---

A. Satellite dependent biases due to uncertainty in the orbital parameters of the satellite

---

B. Receiver -dependent biases due to clock stability with line

---

C. Signal propagation biases due to the sphere and troposphere propagation

---

D. All the above

---

All the above

57 - 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

---

None of these

58 - Which one of the following statements is correct regarding the GPS satellites ?

---

A. The nominal altitude is about 20,200 km

---

B. The inclination of axis satellite is 55°

---

C. The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)

---

D. All of these

---

All of these

59 - Which one the following is a correct statement ?

---

A. The vertical section of the soil extending into the parent material, is called profile

---

B. The layers of the soil parallel to the earth surface are called horizons

---

C. The transitional layer between two adjoining horizons is called boundary

---

D. All of these

---

All of these

60 - Who coined the term, 'Remote sensing_______________?

---

A. Evelyn L. Pruitt, a geographer

---

B. Gaspard Felix Tournachon, a French scientist

---

C. Wilbur Wright, an Italian scientist

---

D. None of these

---

Evelyn L. Pruitt, a geographer

Pages