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21.

If x is the smallest division on the main scale and n are the number of divisions on the vernier, then the least count of the vernier is

A.	x + n	B.	x - n
C.	x x n	D.	x ? n

22.

An average length of a pace is

A.	60 cm	B.	80 cm
C.	100 cm	D.	120 cm

23.

The method of measuring distance by pacing is chiefly used in

A.	reconnaissance surveys	B.	preliminary surveys
C.	location surveys	D.	all of these

24.

A metallic tape is made of an alloy of nickel and steel.

True

False

25.

An invar tape is generally used for accurate measurement of distance because it possesses

A.	zero	B.	low
C.	high

26.

The instrument attached to the wheel of a vehicle in order to measure the distance travelled, is called

A.	passometer	B.	pedometer
C.	odometer	D.	speedometer

27.

It is more convenient and gives better results while measuring horizontal distance

A.	down the hill	B.	up the hill
C.	in plane areas

28.

Which of the following statement is correct?

A.	The line ranger is used for fixing intermediate points on the chain lines.	B.	The indirect ranging is resorted to when the ends of a line are not intervisible due to high ground.
C.	The chainman at the forward end of the chain is called leader.	D.	all of the above

29.

The correction to be applied to each 30 m chain for a line measured along a slope of ? is

A.	30 (1 - sin ?)	B.	30 (1 - cos ?)
C.	30 (1 - tan ?)	D.	30 (1 - cot ?)

30.

Direct ranging is possible only when the end stations are

A.	close to each other	B.	not more than 100 m apart
C.	mutually intervisible	D.	located at highest points in the sea