MPSC PYQ
Science & Technology

Polar Orbit

Polar Orbit is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2018, 2020). Below are those real questions with their correct answers and explanations.

Real questions
2
Years tested
2 · 2018–2020
In context
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Asked in

20202018

Real questions that test this

खालीलपैकी काय जिओस्टेशनरी ऑर्बिट (GEO) चे अचूकपणे वर्णन करते ? / Which of the following describes the Geostationary Orbit (GEO) correctly ?

1)समुद्रसपाटीपासूनची उंची 20,000 कि.मी. व एक कक्षा परिभ्रमणास 12 तास लागतात. / Altitude of 20,000 km above the sea level and the orbital period is 12 hours.
2)समुद्रसपाटीपासूनची उंची 36,000 कि.मी. व एक कक्षा परिभ्रमणास 24 तास लागतात. / Altitude of 36,000 km above the sea level and the orbital period is 24 hours.✓ Correct
3)समुद्रसपाटीपासूनची उंची 400 कि.मी. व एक कक्षा परिभ्रमणास 90 मिनिटे लागतात. / Altitude of 400 km above the sea level and the orbital period is 90 minutes.
4)यापैकी कुठलेही नाही / None of the above

A Geostationary Orbit (GEO) is located at an altitude of approximately 36,000 km above the Earth's equator, and its orbital period matches the Earth's rotational period of 24 hours.

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.

1)दोनों विधाने चूक आहेत. / Both statements are false
2)(a) विधान बरोबर आणि ते (b) ची कारणमीमांसा आहे. / (a) is true and is a reason of (b)✓ Correct
3)(a) विधान बरोबर आणि ते (b) ची कारणमीमांसा नाही. / (a) is true and is not a reason of (b)
4)(a) बरोबर परंतु (b) चूक आहे. / (a) is correct, (b) is not

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).

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