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4

According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of

A. Tangents of two adjacent parts

B. Sines of two adjacent parts

C. Cosines of two adjacent parts

D. Both (a) and (b) above

Correct Answer :

D. Both (a) and (b) above


Related Questions

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4

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

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4

The nautical mile is the length of

A. 1 minute of latitude

B. 1 minute of longitude

C. 1 degree of latitude

D. 1 degree of longitude

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4

In field astronomy, the quantities observed are entirely

A. Lengths

B. Angles

C. Heights

D. All of these

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4

Pick up the in-correct statement from the following:

A. Correction for refraction is always negative

B. Correction for parallax is always positive

C. Correction for semi-diameter is always negative

D. Correction for dip is always negative

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4

The method of surveying by triangulation was first introduced by the Dutchman Snell in

A. 1600

B. 1615

C. 1630

D. 1650

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4

The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude:

A. Mean sun

B. True sun

C. Vernal equinox

D. All the above

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4

The angular distance of a heavenly body from the equator, measured along its meridian, is called

A. Declination

B. Altitude

C. Zenith distance

D. Co-latitude

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4

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)

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4

The latitude (λ) of a place and the altitude (α) of the pole are related by

A. λ = α

B. λ = 90° - α

C. λ = α - 90°

D. λ = 180° - α

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4

Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year

A. Once

B. Twice

C. Thrice

D. Four times

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4

An aerial photograph may be assumed as

A. Parallel projection

B. Orthogonal projection

C. Central projection

D. None of these

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4

The scale of the photography taken from a height of 300 m, with a camera of focal length 15 cm, is

A. 1 : 10,000

B. 1 : 15,000

C. 1 : 20,000

D. 1 : 30,000

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4

The distance between the projection centre and the photograph, is called

A. Principal distance

B. Principal line

C. Isocentric distance

D. Focal length

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4

If E is the spherical excess and R the radius of the earth, the surface area of the triangle, is

A. πR²E/90°

B. πR²E/180°

C. πR²E/270°

D. πR²E/360°

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4

The distance between the minor control point and the principal point should be equal to

A. Base line of the left photograph of stereo pair

B. Base line of the right photograph of stereo pair

C. Sum of the base lines of stereo pair

D. Mean of the base lines of the stereo pair

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4

If the general ground level of any area is 10% of the flying height, the principal points may be used as the centres of radial directions for small scale mapping even in tilted photograph up to

A.

B.

C.

D.

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4

The nearest star is so far away from the earth that the directions to it from two diametrically opposite points on the earth differs less than

A. 0.01 second

B. 0.001 second

C. 0.0001 second

D. None of these

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4

The scale of a tilted photograph of focal length f, taken from an altitude H, along the plate parallel through plumb point, is

A. f/H sec θ

B. f sec θ/H

C. f/H

D. f/H cos ½θ

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4

The sun's declination remains north between

A. March 21 to June 21

B. June 21 to September 21

C. September 21 to December 21

D. Both (a) and (b) of above

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4

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

A. Length of the equator between their longitudes

B. Length of the parallel between their longitudes

C. Length of the arc of the great circle passing through them

D. None of these

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4

The solar tidal force divided by lunar tidal force is

A. 1/3

B. 1/2

C. 3/4

D. 5/4

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4

The length of a parallel of λ latitude between two meridians is equal to difference in longitudes multiplied by

A. sin λ

B. cos λ

C. tan λ

D. cot λ

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4

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. 40°

D. 45°

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4

The difference of height of two points whose parallax difference is 0.8 mm on a pair of stereo pair taken from a height H is 100 m. If mean photo base is 95.2 mm, the flying height is

A. 8,000 m

B. 10,000 m

C. 12,000 m

D. 14,000 m

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4

The stereo plotting instruments are generally manufactured on the principle of

A. Optical projection

B. Optical mechanism projection

C. Mechanical projection

D. All the above

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4

The main object of the astronomer to obtain

A. Astronomical latitude

B. Astronomical longitude

C. Astronomical bearing

D. All of these

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4

Longitude of a place is the angular distance between the meridian of the place and

A. The standard meridian

B. The international date line

C. That of Greenwich

D. Both (a) and (c) of above

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4

The angle between the direction of star and the direction of earth's axis of rotation is called

A. Co-declination

B. Co-latitude

C. Declination

D. Latitude

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4

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 (d) of the above

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4

If α, H, A and δ be the altitude, hour angle, azimuth and declination of a circumpolar star at its elongation, in latitude λ, the following relation holds good

A. cos H = tan λ/tan δ

B. sin α = sin λ/sin δ

C. sin A = cos δ/cos λ

D. All the above