INSAT series
INSAT series is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2015, 2020). Below are those real questions with their correct answers and explanations.
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Real questions that test this
_____________ च्यासाहाय्याने दूरचित्रवाणीचे कार्यक्रम सर्व जगामध्ये पाठविणे शक्य आहे. TV programmes can be transmitted all over the world, with the help of ____________ .
(a)भूस्थिर उपग्रह / geostationary satellites
(b)अंतरंग तरंग प्रसारण / space wave propagation
(c)भूतरंग प्रसारण / ground wave propagation
(d)अणू तरंग / longitudinal waves
Geostationary satellites revolve at the same speed as the Earth and cover large areas, making them ideal for telecommunication and transmitting TV programs worldwide. Ground and space wave propagations have distance limitations.
पुढील विधानांचा विचार करा : / Consider the following statements :
(a)दूरसंचार उपग्रहाची गती पृथ्वीच्या गतीशी सापेक्षकपणे शून्य असते. / The speed of telecommunication satellite relative to earth is zero.
(b)म्हणून तो उपग्रह पृथ्वीवरील माणसांस स्थिर आहे असे वाटते. / Hence it appears to be stationary to a person on the earth.
A geostationary telecommunication satellite has an angular speed equal to Earth's rotational speed, so its relative speed with respect to Earth is zero (statement a). Because its relative speed is zero, it appears stationary to an observer on Earth (statement b). Thus, (a) is true and correctly explains (b).