A screw gauge gives the following reading when used to measure the diameter of a wire.

Main scale reading :

Circular scale reading : 52 divisions

Given that  on main scale corresponds to 100 divisions of the circular scale. The diameter of wire from the above data is :

A spectrometer gives the following reading when use to measure the angle of a prism.

Main scale reading : 58.5 degree

Vernier scale reading : 09 divisions

Given that 1 division on main scale corresponds to 0.5 degree. Total divisions on the vernier scale is 30 and match with 29 divisions of the main scale. The angle of the prism from the above data is:

A student measured the length of a rod and wrote it as . Which instrument did he use to measure it?

A screw gauge with a pitch of  and a circular scale with 50 divisions is used to measure the thickness of a thin sheet of Aluminium. Before starting the measurement, it is found that wen the two jaws of the screw gauge are brought in contact, the  division coincides with the main scale line and the zero of the main scale is barely visible. What is the thickness of the sheet if the main scale reading is  and the 25 th division coincides with the main scale line?

A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is , and . If the minimum division in the measuring clock is , then the reported mean time should be:

The following observations were taken for determining surface tensiton  of water by capillary method :

Diameter of capilary,  rise of water,  Using  and the simplified relation                , the possible error in surface tension is closest to :

In a simple pendulum experiment for determination of acceleration due to gravity , time taken for 20 oscillations is measured by using a watch of 1 second least count. The mean value of time taken comes out to be . The length of pendulum is measured by using a meter scale of least count  and the value obtained is . The percentage error in the determination of  is close to:

If the screw on a screw-gauge is given six rotations, it moves by  on the main scale. If there are 50 divisions on the circular scale the least count of the screw gauge is:

What is the function of a screw gauge in the experiment of determining Young's modulus of a wire?

Which of the following instrument can be used to determine the radius of curvature of a spherical surface?