State the rules used for significant figures while rounding off the digits.

State the number of significant figures in 86400

State the number of significant figures in 0.2300m

State the number of significant figures in 6.032 J .

State the number of significant figures in the following: 5100 kg

State the number of significant figures in each of the following :

Round off 12.115 to 4 digits

The length of the string of a simple pendulum is 102.6 cm and the diameter of the bob is 2.56 cm. What is the effective length of the simple pendulum by using the correct number of significant figures? (Rounding off is not to be considered.)

State the rule used in the operation of an OR gate