Physics
Identify the incorrect statement from the following :
(a) A screw gauge is used to measure very small dimensions like the thickness of a wire or sheet.
(b) Vernier callipers is used to measure larger dimensions like the diameter of a sphere, internal or external diameter lengths, etc.
(c) Vernier callipers works on the principle of a sliding scale to measure fractional parts of a main scale.
(d) Vernier callipers has a higher precision with a larger least count whereas screw gauge has a lower precision with a smaller least count.
Answer
Vernier callipers has a higher precision with a larger least count whereas screw gauge has a lower precision with a smaller least count.
Reason — A screw gauge has higher precision (smaller least count) than vernier callipers, not lower and screw gauge can typically measure up to 0.01 mm or 0.001 cm, whereas a vernier caliper usually has a least count of 0.1 mm or 0.01 cm. So, the screw gauge is more precise.
Related Questions
Identify the correct use of the thimble of a screw gauge:
- To read length correct up to 0.01 mm
- To read length correct up to 1 mm
- To mark main scale and base line
- To mark circular scale.
The circular head of a screw gauge is divided into 50 divisions and the screw moves 1 mm ahead in two revolutions of the circular head. Its pitch would be:
- 0.05 cm
- 0.001 cm
- 0.5 cm
- 0.01 cm
Define the least count of an instrument.
How can you decrease the least count of a vernier callipers?