Elements of Remote Sensing Online Test – Multiple Choice Questions and Answers 1. Which one of the following statement is incorrect regarding the electromagnetic radiation? The changing electric fields induce the changing magnetic fields in the surrounding medium These are produced by the motion of electric charge The oscillation of charged particles sets up changing electric fields None of these 2. In GPS, receivers are used are ; quartz clocks atomic clocks mechanical clocks electronic clocks 3. Repetitive observations of the same area at equal interval of time, are useful to monitor the dynamic phenomena : Snow cover Vegetative cover Forest fires All of these 4. Formation of snow occurs if the cloud temperature is just above the freezing point at the freezing point below the freezing point None of these 5. For interpolation of satellite data used for monitoring dynamic changes that occure on the earth surface, the most suitable orbit for the satellite is : near polar orbit circular orbit sun-synchronous orbit None of these 6. Consider the following statements regarding the satellite imaging : 1. The satellite orbit is fixed in the inertial space 2. During successive across-track imaging, the earth rotates beneath the sensor 3. The satellite images a skewed area Which one of the following statements is/are correct ? 1,2 1,3 2,3 1,2,3 7. The altitudinal distance of a geostationary satelite from the earth is about: 26, 000 km 30, 000 km 36, 000 km 44, 000 km 8. For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length lcoh is: 130 km 230 km 500 km 250 km 9. Orbital radius of GPS satellites is approximately: 15,200 km 18,400 km 26,600 km 36,000 km 10. Crop Acreage and Production Estimation (CAPE) was funded and taken up in 1983 by: India Russia European Union USA Loading … Question 1 of 10
