51
In field astronomy, the quantities observed are entirely
A)
Lengths
B)
Angles
C)
Heights
D)
All of these
Answer & Solution
Answer: Option
B
52
The net ground area of a vertical photograph 20 cm × 20 cm on scale 1 : 10,000 having overlaps 60% and 30%, is
A)
0.50 sq km
B)
0.56 sq km
C)
0.60 sq km
D)
0.64 sq km
Answer & Solution
Answer: Option
D
53
Spring tides are caused when
A)
Sun and moon are in line with earth
B)
Solar tidal force acts opposite to lunar tidal force
C)
Solar tidal force and lunar tidal force both coincide
D)
None of these
Answer & Solution
Answer: Option
C
54
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
Answer & Solution
Answer: Option
D
55
The time interval between successive transits of the moon, is
A)
24 hours 10 minutes
B)
20 hours 25 minutes
C)
24 hours 50 minutes
D)
23 hours 50 minutes
Answer & Solution
Answer: Option
C
56
If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to
A)
$${\text{d}}$$
B)
$$\frac{1}{{\text{d}}}$$
C)
$${{\text{d}}^2}$$
D)
$$\frac{1}{{{{\text{d}}^2}}}$$
Answer & Solution
Answer: Option
C
57
A star in northern sphere is said to transit
A)
When its altitude is maximum
B)
When its azimuth is 180°
C)
When it is in south
D)
All the above
Answer & Solution
Answer: Option
D
58
Normal tension is that pull which
A)
is used at the time of standardising the tape
B)
neutralizes the effect due to pull and sag
C)
makes the correction due to sag equal to zero
D)
makes the correction due to pull equal to zero
Answer & Solution
Answer: Option
B
59
After fixing the plane table to the tripod, the main operations which are needed at each plane table station are
A)
(i), (ii), (iii)
B)
(i), (iii), (ii)
C)
(iii), (i), (ii)
D)
(ii), (iii), (i)
Answer & Solution
Answer: Option
B
60
For accurate work, the steel band should always be used in preference to chain because the steel band
A)
is lighter than chain
B)
is easier to handle
C)
is practically inextensible and is not liable to kinks when in use
D)
can be easily repaired in the field
Answer & Solution
Answer: Option
C
