Assertion (A) : The least count of a screw gauge can be decreased by increasing the pitch and decreasing the total number of divisions on circular scale.

Reason (R) : Least count of screw gauge is directly proportional to pitch of the screw gauge.

1. both A and R are true and R is the correct explanation of A
2. both A and R are true and R is not the correct explanation of A
3. assertion is false but reason is true
4. assertion is true but reason is false

Assertion (A) : A pendulum clock goes slow (i.e., the time period of oscillation increases) when it is taken to mines.

Reason (R) : This is due to increase in the value of acceleration due to gravity g.

1. both A and R are true and R is the correct explanation of A
2. both A and R are true and R is not the correct explanation of A
3. assertion is false but reason is true
4. assertion is true but reason is false

Define the terms: (i) oscillation (ii) amplitude (iii) frequency, and (iv) time period as related to a simple pendulum

Name two factors on which the time period of a simple pendulum does not depend.