This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “Sensors”.
1. Strength of signal doesn’t depend upon which of the following factors?
a) Energy flux
b) Dwell time
Explanation: A signal can have the capacity of recording and displaying numerical data or an image. It depends on energy flux, altitude, spectral band width, dwell time and instantaneous field of view.
2. Which of the following indicates the correct set of bands operated in LISS- III satellite?
a) Visible ray, near IR
b) Near IR, radio wave
c) Radio wave, near IR
d) Far IR, near IR
Explanation: LISS-III also known as Linear Imaging Self Scanning Sensor is mounted on Indian satellite IRS-1A. It is capable of operating three bands, which comprises one visible ray, near IR and in short wave IR regions.
3. Energy flux may affect which of the following?
b) Strength of the signal
Explanation: The value of energy flux will affect the strength of the signal as they are interconnected with each other. Not only energy flux, altitude, spectral band width will also affect the strength of the signal.
4. Which of the following can merge the imagery of LISS-III and PAN?
a) IRS 1B
b) IRS 1A
c) IRS 1C
d) IRS multi sensor
Explanation: IRS multi sensor is having the capacity to merge the imageries of LISS-III and the PAN. This will improve the quality of the output and enhance the image for better resolution.
5. Which among the following indicates the correct expansion of WiFS?
a) Wide Field Sensor
b) Wireless Fidelity Sensor
c) Wide Fidelity Sensor
d) Wireless Field Sensor
Explanation: The expansion of WiFS can be given as Wide Field Sensor, which is placed on the boards of IRS 1C and 1D satellites. These play a major role in the determination of object specifications.
6. IRS P3 satellite uses which of the following sensors?
Explanation: Modular Opto -Electronic Scanner, having a wide range capacity is mounted on the IRS P3 satellite. This is having great importance in this satellite as it having a wide coverage capacity.
7. PAN sensor uses two band operators.
Explanation: Panchromatic sensor is placed on the boards of IRS 1C and 1D. This is having the capability of handling only a single band which will be any of the waves in the EM spectrum.
8. While mapping land use and land cover, which scale is recommended?
a) 1: 25000
b) 1: 50000
c) 1: 250000
d) 1: 25
Explanation: In general, the mapping of the land use and land cover is done so as to have a detailed description about each and every aspect. For this, a scale of 1: 25000 scale is recommended as it can have better visuals.
9. The sensor used in the digital elevation model can identify contour heights greater than_____
a) 5 m
b) 30 m
c) 20 m
d) 10 m
Explanation: Every sensor is having the capacity to record and display information. The display of information is bounded within its limits. The sensors used in digital elevation model can determine the object height greater than 10m, which is useful in detailed interpretation.
10. IRS 1A and 1B satellites can carry which of the following sensors?
Explanation: The satellites IRS 1A and 1B may have the LISS-I and LISS-II sensors, which are mounted on their boards. These will enhance the capacity of the satellite and in turn increases the covering capacity.
Sanfoundry Global Education & Learning Series – Surveying.
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