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

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

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

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

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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___________________?

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?

3 - A passive sensor uses ________________?

4 - A reduction of nitrogen nutrient in plants_______________?

5 - Critical angle of electromagnetic radiation takes place if__________________?

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___________________?

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

8 - Earth observations from a satellite platform provide____________?

9 - Economical depth of a plate girder corresponds to_________________?

10 - Electromagnetic radiation_______________?

11 - Electromagnetic spectrum contains________________?

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

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______________?

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

15 - Geodimeter is based on_________________?

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

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___________________?

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___________________?

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

20 - In GPS, receivers used are___________________?

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

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

23 - Leaf reflectance depends primarily on______________?

24 - Minimum spacing of vertical stiffeners is limited to________________?

25 - Orbital radius of GPS satellites is approximately ___________________?

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

27 - Pick up the correct statement from the following ?

28 - Pick up the correct statement from the following ?

29 - Pick up the correct statement from the following ?

30 - Pick up the correct statement from the following ?

31 - Pick up the correct statement from the following ?

32 - Pick up the correct statement from the following?

33 - Pick up the correct statement from the following_________________?

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

35 - Spatial variation in horizontal and vertical directions is caused due to_________________?

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

37 - The basic requirement of any sensor system is___________________?

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

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

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

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

42 - The most widely used antenna in GPS is_______________?

43 - The normal altitude of GPS satellite is about________________?

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

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_________________?

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________________?

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

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

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

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

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

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

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

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

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

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

57 - Which one of the following statement is incorrect regarding the electromagnetic radiation ?

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

59 - Which one the following is a correct statement ?

60 - Who coined the term, 'Remote sensing_______________?

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