National Standard Examination in Astronomy (NSEA) Solved Paper 2016 Part-20

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Q: 70. At the earth’s equator a satellite is observed passing directly overhead moving west to east in the sky. Exactly 12 hours later, satellite is again observed directly overhead. The altitude of the satellite is (Radius of the earth=6400 km)

(A)

(B)

(C)

(D)

Answer: (D)

Q: 71. Passage 71 to 73

Two stars, with masses are in circular orbit around their common centre of mass. The star with mass has an orbit of radius and the star with mass has an orbit of radius The correct relation is.

(A)

(B)

(C)

(D)

Answer: (A)

Q: 72. The time period of each of the star is

(A)

(B)

(C)

(D)

Answer: (B)

Q: 73. The two stars in certain binary system move in circular orbits. The first star alpha has an orbital speed of The second star, beat has an orbital speed of The orbital period of first star is 137 days. The mass of the two stars are about

(A)

(B)

(C)

(D)

Answer (B)

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