Advance Surveying Section 1

The point on the celestial sphere vertically below the observer's position, is called

• zenith

• celestial point

• nadir

• pole

The parallax equation is applicable to entire overlap of the photographs only if parallax is measured

• normal to base line

• parallel to base line

• both (a) and (b)

• neither (a) nor (b)

The stereo plotting instruments are generally manufactured on the principle of

• optical projection

• optical mechanism projection

• mechanical projection

• all the above

Latitude of a place is the angular distance from

• Greenwich to the place

• equator to the poles

• equator to the nearer pole

• equator to the nearer pole along the meridian of the place

• none of these

International date line is located along

• standard meridian

• Greenwich meridian

• equator

• 180° longitude

• none of these

The shortest distance between two places measured along the surface of the earth, is

• length of the equator between their longitudes

• length of the parallel between their longitudes

• length of the arc of the great circle passing through them

• none of these

The correction for parallax, is

• - 8".8 cos α

• + .8" sin α

• + 8".8 cos α

• - 8".8 cos α

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

• 22° 30'

• 23° 27'

• 23° 30'

• 24° 0'

Perspective centre relates to

• parallel projection

• orthogonal projection

• central projection

• none of these

The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is

• altitude and azimuth system

• declination and hour angle system

• declination and right ascension system

• declination and altitude system

• azimuth and declination system