Measurement Measuring Devices

A student measured the diameter of a small steel ball using a screw gauge of least count cm. The main scale reading is mm and zero of circular scale division coincides with divisions above the reference level. If the screw gauge has a zero error of cm, the correct diameter of the ball is:

1.	cm	2.	cm
3.	cm	4.	cm

The angle of (minute of an arc) in radian is nearly equal to:
1.
2.
3.
4.

A screw gauge gives the following readings when used to measure the diameter of a wire:
Main scale reading: mm
Circular scale reading: divisions
Given that mm on the main scale corresponds to divisions on the circular scale, the diameter of the wire that can be inferred from the given data is:

1.	cm	2.	cm
3.	cm	4.	cm

In a vernier callipers, divisions of the vernier scale coincide with divisions of the main scale. If represents , the vernier constant (in ) is:

1.		2.
3.		4.

Consider the diameter of a spherical object being measured with the help of a Vernier callipers. Suppose its Vernier Scale Divisions (V.S.D.) are equal to its Main Scale Divisions (M.S.D.). The least division in the M.S. is and the zero of V.S. is at when the jaws of Vernier callipers are closed. If the main scale reading for the diameter is and the number of coinciding vernier division is the measured diameter after zero error correction, is:
1.
2.
3.
4.