651. The great circle along which the sun appears to trace on the celestial sphere with earth as centre during the year, is called
A. equator
B. celestial equator
C. ecliptic
D. none of these.

652. The angle between the plane of the equator and the plane of the ecliptic, is known as obliquity of the ecliptic and its value is
A. 22?30′
B. 23?27′
C. 23?30′
D. 24?0′.

653. At the first point of Aeries, the sun moves
A. northward
B. southward
C. from south to north of the equator
D. from north to south of the equator.

654. The point at which sun’s declination changes from north to south, is known as
A. first point of Aeries
B. first point of Libra
C. vernal Equinox
D. both (b) and of the above.

655. The position of the sun when its north declination is maximum is known as
A. vernal equinox
B. Autumnal equinox
C. summer solstice
D. winter solstice.

656. The declination and right ascension of the sun are each equal to zero on
A. March 21
B. June 21
C. September 21
D. December 22.

657. The declination and right ascension of the sun becomes 23? 27′ N and 900 respectively on
A. March 21
B. June 21
C. September 21
D. December 22,

658. The declination and right ascension of the sun becomes 23? 27′ S and 270? respectively on
A. March 21
B. June 21
C. September 21
D. December 22.

659. Assertion A : Basin walls have to be of much grater height than dock walls. Reason R : Tidal basins are subject to fluctuations of levels due to tidal variations?
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.

660. Which of the following are repair docks ?
A. marine railways, dry docks, floating docks, wet docks
B. dry docks, wet docks, floating docks, lift docks
C. wet docks, floating docks, lift docks, marine railways
D. wet docks, lift docks, marine railways, dry docks

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