471. Systematic errors are those errors
A. which cannot be recognized
B. whose character is understood
C.whose effects are cumulative and can be eliminated
D. none of these.
472. If the smallest division of a vernier is longer than the smallest division of its primary scale, the vernier is known as
A. direct vernier
B. double vernier
C. retrograde vernier
D. simple vernier.
473. The least count of a vernier scale is
A. sum of the smallest divisions of main and vernier scales value of one division of the primary scale divided by total number of divisions of vernier scale
B. value of one division of vernier scale divided by total number of divisions of primary scale
C. all the above.
D. none of these.
474. On a diagonal scale, it is possible to read up to
A. one dimension
B. two dimensions
C. three dimensions
D. four dimensions.
475. In case of a direct vernier scale
A. graduations increase in opposite direction in which graduations of the main scale increase
B. smallest division is longer than smallest division of the main scale
C. graduations increase in the same direction in which graduations of the main scale increase
D. none of these.
476. Short offsets are measured with
A. an ordinary chain
B. an invar tape
C. a metallic tape
D. a steel tape.
477. Greater accuracy in linear measurements, is obtained by
A. tacheometry
B. direct chaining
C. direct taping
D. all the above.
478. It is more difficult to obtain good results while measuring horizontal distance by stepping
A. up-hill
B. down-hill
C. in low undulations
D. in plane areas.
479. The distance between steps for measuring down hill to obtain better accuracy
A. decreases with decrease of slope
B. increases with increase of slope
C. decreases with increase of slope
D. decreases with decrease of weight of the chain.
480. The correction to be applied to each 30 metre chain length along 00 slope, is
A. 30 (sec 0 ? 1) m
B. 3-0 (sin 0 ? 1) m
C. 30 (cos 0 ? 1) m
D. 30 (tan 0 ? 1) m
NOTE
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