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| 61. |
A French cross-staff has a magnetic compass at the top. |
Answer: Option B
Explanation:
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| 62. |
An open cross-staff is commonly used for setting out |
| A. |
short offsets |
B. |
long offsets |
| C. |
oblique offsets |
D. |
none of these |
Answer: Option B
Explanation:
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| 63. |
An optical square is used for the same purpose as the cross-staff, but it is more accurate. |
Answer: Option A
Explanation:
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| 64. |
The angle of intersection of the horizon glass and index glass in an optical square is |
Answer: Option B
Explanation:
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| 65. |
The horizon glass in an optical square is |
| A. |
wholly silvered |
B. |
wholly unsilvered |
| C. |
one-fourth silvered and three-fourth unsilvered |
D. |
half silvered and half unsilvered |
Answer: Option D
Explanation:
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| 66. |
The index glass in an optical square is |
| A. |
wholly silvered |
B. |
wholly unsilvered |
| C. |
one-fourth silvered and three-fourth unsilvered |
D. |
half silvered and half unsilvered |
Answer: Option A
Explanation:
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| 67. |
The optical square is used to measure angles by |
| A. |
refraction |
B. |
reflection |
| C. |
double refraction |
D. |
double reflection |
Answer: Option B
Explanation:
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| 68. |
The instrument, belonging to a class of reflecting instrument, is |
| A. |
line ranger |
B. |
box sextent |
| C. |
prismatic compass |
D. |
all of these |
Answer: Option D
Explanation:
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| 69. |
In an optical square, the angle between the first incident ray and the last reflected ray is |
Answer: Option B
Explanation:
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| 70. |
When the object lies on the left hand side of the chain line, then while taking offset with an optical square, it is held in |
| A. |
left hand upside down |
B. |
right hand upside down |
| C. |
left hand upright |
D. |
right hand upright |
Answer: Option D
Explanation:
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