SURVEYING QUIZ

α and β are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being ‘S’ and ‘f’ respectively. Parallax displacement of the point due to relief, is

h tan β/S

h (tan α - tan β)/S

h tan α/S

h (tan α + tan β)/S

TRUE ANSWER : ?
YOUR ANSWER : ?

The altitudes of a circumpolar star at culminations are 70° and 10°, both culminations being north of zenith. The declination of the star, is

80°

70°

60°

50°

TRUE ANSWER : ?
YOUR ANSWER : ?

If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference toi) altitude bubble on index frameii) altitude bubble on index frame if it is to be used as a leveliii) altitude bubble on telescopeiv) altitude bubble on telescope if it is to be used as a level The correct answer is

both (ii) and (iii)

both (i) and (iv)

only (i)

only (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?

The suitable contour interval for a map with scale 1 : 10000 is

5 m

2 m

20 m

10 m

TRUE ANSWER : ?
YOUR ANSWER : ?

G.M.T. corresponding to given mean time, equals

L.M.T. + East longitude in time

L.M.T. - West longitude in time

None of these

L.M.T. - East longitude in time

TRUE ANSWER : ?
YOUR ANSWER : ?

The latitude of a place was obtained by subtracting the declination of a star from its zenith distance, the observed star was between

Equator and zenith

Horizon and equator

Pole and horizon

Zenith and pole

TRUE ANSWER : ?
YOUR ANSWER : ?

Subtense bar is an instrument used for

measurement of angles

measurement of horizontal distances in undulated areas

measurement of horizontal distances in plane areas

levelling

TRUE ANSWER : ?
YOUR ANSWER : ?

The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be

closer to the higher station

as far as possible from the line AB

equidistant from A and B

closer to the lower station

TRUE ANSWER : ?
YOUR ANSWER : ?

In a spherical triangle ABC right angled at C, sin b equals to

sin c cos B

tan c tan B

cos c cos B

sin c sin B

TRUE ANSWER : ?
YOUR ANSWER : ?

The correction for sag is

always subtractive

always zero

always additive

sometimes additive and sometimes subtractive

TRUE ANSWER : ?
YOUR ANSWER : ?

↑