Practice Test: Question Set - 09
1. The zenith is the point on the celestial sphere
- (A) East
of observer
- (B) West
of observer
- (C) North
of observer
- (D) South
of observer
2. Rotation of the camera at exposure about its vertical axis, is known as
- (A) Swing
- (B) Tilt
- (C) Tip
- (D) None of
these
3. In a spherical triangle ABC, right angled at C, sin b equals
- (A) sin a cos A
- (B) cos a sin A
- (C) tan a cot A
- (D) cot A tan a
4. 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
5. Sidereal day
- (A) Is
the period of time taken by the earth in making a complete rotation with
reference to stars
- (B) Is slightly
shorter than an ordinary solar day
- (C) Is
divided into the conventional hours, minutes and seconds
- (D) All the
above
6. If θ and δ be the latitude of an observer and declination of a heavenly body respectively, the upper culmination of the body will be south of zenith if its zenith distance, is
- (A) δ - θ
- (B) θ - δ
- (C) θ + δ
- (D) ½ (θ - δ)
7. With standard meridian as 82° 30' E the standard time at longitude 90° E is 8 h 30 m. The local mean time at the place will be
- (A) 7 h 00 m
- (B) 7 h 30 m
- (C) 8 h 00 m
- (D) 9 h 00 m
8. The scale of a vertical photograph of focal length ‘f’ taken from height of ‘H’ metres above M.S.L., at a point of reduced level ‘h’, is
- (A) f/H
- (B) f/(H
+ h)
- (C) f/(H
- h)
- (D) (H - h)/f
9. The latitude of a place was obtained by subtracting the declination of a star from its zenith distance, the observed star was between
- (A) Horizon and
equator
- (B) Zenith and
pole
- (C) Equator and
zenith
- (D) Pole and
horizon
10. Systematic errors
- (A) Always
follow some definite mathematical law
- (B) Can
be removed by applying corrections to the observed values
- (C) Are also
known as cumulative errors
- (D) All the
above
11. Pick up the correct statement from the following:
- (A) The
principal point coincides with plumb point on a true vertical photograph
- (B) The top of a
hill appears on a truly vertical photograph at greater distance than its bottom
from the principal point
- (C) The top of a
hill is represented on a vertical photograph at larger scale than the area of a
nearby valley
- (D) All the
above
12. The position of a heavenly body on the celestial sphere can be completely specified by
- (A) Its altitude
and azimuth
- (B) Its
declination and hour angle
- (C) Its
declination and right ascension
- (D) All the
above
13. A star is said to elongate
- (A) When the
star momentarily moves vertically
- (B) When the
angle at the star of the spherical triangle is 90°
- (C) When the
star's declination is greater than the observer's latitude
- (D) All the
above
14. The elevation of the star at elongation is obtained by
- (A) sin α = sin φ cosec δ
- (B) sin α = sin φ sec δ
- (C) sin α = cos φ sec δ
- (D) sin α = cos φ cosec δ
15. If the altitudes of a star at its upper and lower transits are 60° 30' and 19° 30' respectively, the latitude of the place, is
- (A) 30°
- (B) 35°
- (C) 30°
- (D) 45°
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