UPSC Prelims 2015 Question:

In which of the following activities are Indian Remote Sensing (IRS) satellites used?

1. Assessment of crop productivity
2. Locating groundwater resources
3. Mineral exploration
4. Telecommunications
5. Traffic studies
   
   

Select the correct answer using the code given below:

Explanation: 

• • Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation at a distance (typically from satellite or aircraft). Special cameras collect remotely sensed images, which help researchers "sense" things about the Earth.
    
    
  • The Indian Space programme has two significant operational systems: 
    • Indian National Satellite (INSAT) which is a geostationary satellite used for television broadcasting, telecommunication and meteorological services.
      
      
    • Indian Remote Sensing Satellite (IRS) for monitoring and management of natural resources such as mineral exploration, locating groundwater resources, disaster management support and assessment of crop productivity. So, points 1, 2 and 3 are correct.
      
      

• Telecommunications and traffic studies are not done by IRS. So, points 4 and 5 are not correct.
  
  

Therefore, option (1) is the correct answer.

Subject: Science & Technology | Space and Related Developments