# Practice Test: Question Set - 05

**1. Limiting gradient for locating the base line on evenly-sloping ground, is**

- (A) 1 in 12

- (B) 1 in 10

- (C) 1 in 8

- (D) 1 in 6

**2. The circle in which a plane tangent to the earth's surface at the point of observation, intersects the celestial sphere, is called**

- (A) Visible
horizon

- (B) Sensible
horizon

- (C) Celestial
horizon

- (D) True
horizon

**3. The great circle along which the sun appears to trace on the celestial sphere with earth as centre during the year, is called**

- (A) Equator

- (B) Celestial
equator

- (C) Ecliptic

- (D) None
of these

**4. The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as**

- (A) Isocenter

- (B) Principal
point

- (C) Perspective
centre

- (D) Plumb line

**5. In triangulation surveys**

- (A) The area is
divided into triangular figures

- (B) Control
stations are located from which detailed surveys are carried out

- (C) Sides
are not measured excepting the base line

- (D) All the
above

**6. The First Point of Aeries**

- (A) Is
the point in the celestial sphere where zero meridian crosses the celestial
equator

- (B) Is
usually denoted by the Greek letter γ

- (C) Is
located near the very conspicuous rectangle of stars in the constellations of
Pegasus and Andromeda

- (D) All the
above

**7. The longitudes of two places at latitude 60° N are 93° E and 97° W. Their departure is**

- (A) 5100
nautical miles

- (B) 5700
nautical miles

- (C) 120
nautical miles

- (D) 500
nautical miles

**8. 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- (A)

*h tan*α/

*S*

- (B)

*h tan*β/

*S*

- (C)

*h*(

*tan*α + tan β)/

*S*

- (D)

*h*(

*tan*α - tan β)/

*S*

**9. In a spherical triangle ABC right angled at**

*C*, sin*b*equals to- (A)

*sin*

*c*

*sin*

*B*

- (B)

*cos*

*c*

*cos*

*B*

- (C)

*tan*

*c*

*tan*

*B*

- (D)

*sin*

*c*

*cos*

*B*

**10. 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

**11. For plane ground the scale of a vertical photograph will be same as that of a tiled photograph along the photo parallel through**

- (A) Isocenter

- (B) Plumb point

- (C) Principal
point

- (D) None of
these

**12. Assuming human normal vision distance 25 cm, smallest measurable angle 20", and intraocular distance 6.5 cm, the smallest depth to be discerned is**

- (A) 0.1 mm

- (B) 0.5 mm

- (C) 1.00 mm

- (D) 1.1 mm

**13. The altitude of a circumpolar star is maximum when it is**

- (A) At east
elongation

- (B) At upper
culmination

- (C) At west
elongation

- (D) At
lower culmination

**14. If**

*v*,*t*and*f*/*H*are the ground speed of the aircraft, the shutter speed of the camera and the scale of the photograph respectively, then the amount of image displacement- (A)

*i*=

*v. t. H*/

*f*

- (B)

*i*=

*v. f*/

*t. H*

- (C)

*i*=

*v. t.*(

*f*/

*H*)

- (D)

*i*=

*t. H*/

*v. f*

**15. The negative sign is assigned to**

- (A) Reduction to
mean sea level

- (B) Correction
for horizontal alignment

- (C) Correction
for slope

- (D) All the
above

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