# 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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