While  measuring the length of a piece of a chalk by Vernier calipers. The main scale reading is found  to be  between 5.2cm and the 5th division of a vernier scale is found to coincide with a division on the  main scale.  Find the length of the chalk if the least count  of the vernier is 0.01cm and zero error is  0.02cm.

To find the weight of a person ______________ balance is used.

Second is the time taken for  9,192,631,770 vibrations of a _____________ atom of atomic mass number 133.

If an instrument gives nearly equal values in repeated measurements, it possesses

Time of one vibration or  1/2 oscillation of a seconds pendulum is 

The time period of a simple pendulum  is directly proportional to the _________ of the length of the pendulum.

A mechanical device which combines a main scale and vernier scale is called 

In railway stations __________ balances are used.

If the  zeroth division of the vernier is on the left of the zeroth division of the main scale,  then the  zero error and zero correction are as follows.

The number of oscillations that the  bob makes per second is called its