1. An instrument used for ranging is
Answer: (b) line ranger
The instrument used for ranging is the line ranger. It's used to align points in a straight line during surveying.
2. Survey plotting can be done with an accuracy of
Answer: (a) 0.25 mm
Survey plotting can be done with an accuracy of 0.25 mm, ensuring detailed and precise measurements.
3. A chain may get elongated due to
Answer: (c) opening of rings
A chain may get elongated due to the opening of rings, which loosens the chain links.
4. A chain is made up of mild steel or galvanised iron wire of diameter
Answer: (b) 4 mm
Chains used in surveying are made from mild steel or galvanized iron wire, typically of 4 mm diameter, ensuring strength and durability.
5. Handles of chains are made up of
Answer: (c) brass
The handles of chains are made of brass, which is resistant to corrosion and wear.
6. Handles are connected to the link by
Answer: (d) swivel joint
The handles of the chain are connected by a swivel joint, allowing flexibility in movement during surveying.
7. Distance between two neighbouring brass rings is
Answer: (b) 20 cm
The distance between neighbouring brass rings on a chain is 20 cm, which helps in easier measurement.
8. The length of a link of Gunter's chain is
Answer: (c) 0.66'
The length of a link in Gunter's chain is 0.66 feet, which is part of the overall chain measurement system.
9. Indirect ranging is adopted when the two ends of chain line are
Answer: (a) mutually invisible
Indirect ranging is adopted when the two ends of the chain line are mutually invisible, such as when there are obstructions between them.
10. A 30 m chain after measuring a distance of 6000 m was found to be 10 cm more than the designated length. If the chain was standardised before the commencement of survey then the true length is
Answer: (b) 6010 m
The true length of the measured distance is 6010 meters when a chain elongation of 10 cm is accounted for after measuring a distance of 6000 meters.