Remote Sensing - Common Section - Geomatics Engineering Previous Year Questions

1

2024 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2024

Water bodies appear in dark tone in Near Infrared (NIR) image, because water ______ most of the NIR radiations incident on it.

A

absorbs

B

emits

C

reflects

D

scatters

Open complete paper

2

2024 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2024

Part of the solar radiation incident on the water surface gets refracted as per

A

Rayleigh’s law

B

Snell’s law

C

Moore’s law

D

Newton’s law

Open complete paper

3

2024 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2024

The wavelength at which maximum energy is radiated or emitted from the forest fire at temperature of 700 °C is ______ µm (rounded off to one decimal place).

Check answer

Open complete paper

4

2024 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2024

Find the best match between remote sensing sensors (Column A) with their characteristics (Column B)

A

P–1, Q–5, R–2, S–3

B

P–3, Q–2 , R–4, S–1

C

P–2, Q–3, R–1, S–5

D

P–1, Q–3, R–4, S–5

Open complete paper

5

2024 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2024

Which of the following parts of the electromagnetic spectrum is/are used in satellite remote sensing for earth observation?

A

Visible wavelengths

B

Thermal Infrared wavelengths

C

Radio wavelengths

D

Gamma wavelengths

Check answer

Open complete paper

6

2025 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2025

The reflectance geometry of white-sky albedo can be represented as_____.

A

bi-directional

B

bi-conical

C

bi-hemispherical

D

directional-conical

Open complete paper

7

2025 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2025

Clouds appear white in optical visible spectral bands of remote sensing images due to ______ scattering.

A

Rayleigh

B

Mie

C

selective

D

non-selective

Open complete paper

8

2025 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2025

If the emissivity of an object varies with wavelength, it is called as ______.

A

grey body

B

black body

C

selective radiant

D

non-selective radiant

Open complete paper

9

2025 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2025

Match the following SAR sensors to their frequency bands

A

P – 3, Q – 2, R – 4, S – 1

B

P – 4, Q – 2, R – 1, S – 3

C

P – 2, Q – 4, R – 1, S – 3

D

P – 1, Q – 4, R – 3, S – 2

Open complete paper

10

2025 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2025

If the radiant temperature of a body is 360 K and its emissivity 0.6, then the kinetic temperature of that body is __________ K (Answer in integer).

Check answer

Open complete paper

11

2025 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2025

A remote sensing instrument measures only in Green, Red and Near-Infrared frequency bands. The remote sensing index/indices that CANNOT be derived using data of this instrument is/are______.

A

Normalized Difference Vegetation Index

B

Atmospherically Resistant Vegetation Index

C

Soil Adjusted Vegetation Index

D

Enhanced Vegetation Index

Check answer

Open complete paper

12

2025 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2025

In case of normalized difference vegetation index (NDVI), which of the following statements is/are correct?

A

It is functionally equivalent to a simple ratio of red to near infra-red reflectance

B

It reduces many forms of multiplicative noise

C

It reduces additive noise

D

It is sensitive to canopy background variations

Check answer

Open complete paper

13

2022 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2022

Electromagnetic Spectrum can be broadly divided as (in order of increasing wavelength)

A

X-rays, Gamma rays, Infrared, Ultraviolet, Visible, Radiowave, Microwave

B

Gamma rays, X-rays, Radiowave, Microwave, Ultraviolet, Infrared, Visible

C

X-rays, Gamma rays, Microwave, Radiowave, Ultraviolet, Infrared, Visible

D

Gamma rays, X-rays, Ultraviolet, Visible, Infrared, Microwave, Radiowave

Open complete paper

14

2022 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2022

The relationship between wavelength (λ), frequency (ν), and velocity (c) of electromagnetic wave is

A

$c = \nu^2 / \lambda$

B

$c = \nu / \lambda$

C

$c = \nu \lambda$

D

$c = \nu \lambda^2$

Open complete paper

15

2022 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2022

Thermal Infrared images are provided by

A

LANDSAT MSS and IRS LISS-II sensors

B

SPOT and CARTOSAT

C

IKONOS and QUICKBIRD

D

LANDSAT TM and NOAA AVHRR sensors

Open complete paper

16

2023 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2023

The following digital numbers are given for a pixel of multispectral sensor. The NDWI (normalized difference water index) for this pixel is __________.(Rounded off to 1 decimal place).
Blue = 136
Green = 200
Red = 245
NIR = 150
TIR = 50

Check answer

Open complete paper

17

2026 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2026

In the following options, the spectral bands of a remote sensing image are mapped to the colours of the display system. Which one of the following combinations indicates a standard False Colour Composite (FCC)?

A

Green to Blue; Red to Green; Near Infrared to Red

B

Near Infrared to Green; Red to Blue; Green to Red

C

Blue to Green; Green to Red; Red to Blue

D

Green to Red; Red to Green; Near Infrared to Blue

Open complete paper

18

2026 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2026

Which one of the following spectral ranges is the most suitable for distinguishing snow from cloud?

A

\(1.55\ \mu m - 1.75\ \mu m\)

B

\(0.45\ \mu m - 0.52\ \mu m\)

C

\(0.52\ \mu m - 0.60\ \mu m\)

D

\(0.76\ \mu m - 0.85\ \mu m\)

Open complete paper

19

2026 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2026

Using the Modified Rayleigh Criteria, for an incidence angle of 20°, select the Root Mean Square (RMS) height (in mm) that appears smooth to an L-band microwave sensor (23.5 cm wavelength) and rough to an X-band microwave sensor (3 cm wavelength).

A

8

B

11

C

1

D

3

Open complete paper

20

2026 · Geomatics Engineering · Common Section · Remote Sensing

Geomatics Engineering (GE) 2026

Select the CORRECT option that shows the match between spectral bands and the factors affecting the spectral signature of vegetation at the leaf level.

Spectral bands	Factors affecting the spectral signature of vegetation at the leaf level
(P) Green	(i) Water content in the leaf
(Q) Red	(ii) Internal structure of the leaf
(R) Near Infrared	(iii) Absorption from chlorophyll
(S) Shortwave Infrared	(iv) Reflectance from chlorophyll

A

(P)-(iv), (Q)-(iii), (R)-(ii) and (S)-(i)

B

(P)-(iii), (Q)-(iv), (R)-(ii) and (S)-(i)

C

(P)-(iv), (Q)-(iii), (R)-(i) and (S)-(ii)

D

(P)-(iii), (Q)-(iv), (R)-(i) and (S)-(ii)

Open complete paper