When the zero division of Head Scale is above the index line, the error and correction are :
-ve,+ve
+ve,-ve
+ve, +ve
-ve, -ve
The value of Least count ,L.C =
1mm
0.001 cm
0.01 cm
None of these
While measuring the diameter of a lead shot using a screw gauge,the reading on the pitch scale is found to be 7.5 mm and that on the head scale is 48. If the least count is 0.01 mm,the diameter of the lead shot is
0.798 mm
7.98 mm
0.0798 mm
0.00798 mm
The distance travelled by the tip of a screw for one complete rotation of its head is called the
Least count
Pitch of the screw
Rotation axis
A screw gauge moves 2 mm on 4 head rotations. The head scale is divided into 50 divisions. Give the Least Count.
1 mm
0.01 mm
0.5 mm
0.05 mm
Pitch of the screw is 1 mm. Head scale has 100 divisions. Give the Least Count.
0.0001 m
1 m
0.00001 m
.001 m
Distance between two adjacent threads on a screw gauge is
Least Count
Main Scale Reading
Pitch
Head Scale Reading
If the zeroth division of the head scale is above the index line ,the error is said to be
Negative
Positive
Neutral
A ______________ consists of a U-shaped metallic frame.
Vernier calipers
Ordinary scale
Screw guage
When a screw gauge of Least count 0.01 mm is used to measure the diameter of a nail, the P.S.R. is found to be 1.5 mm, and H.S.R is 18. Find the diameter of the nail ?
0.0168 mm
16.8 mm
0.168 mm
1.68 mm
