work in progress! Wait for final Blog. Did you know!😯 2 questions have been asked in JEE-Main and 3 in JEE-Advanced on this concept in last 10 years . The measurement of length is necessary in almost all the experiments in Physics. There are experiments where greater accuracy is not required. In such experiments, a meter scale is used to measure distances correctly up to a millimetre. To measure a length correctly up to a fraction of a millimetre, the division must be subdivided. Hence, a meter scale cannot be used in measurements that requires greater accuracy. For accurate measurement up to or of a millimetre, there are various devices that can be used, such as (A) Vernier caliper (B) Screw gauge (I) Vernier caliper:- A Vernier caliper consists of a rectangular steel bar such that inch is marked on one edge and centimetre is on the other edge, as shown in the figure below. It consists of a main scale and over the main scale slides a small scale calle
Did you know! 1 question has been asked in JEE-Main on this concept in last 10 years. Generally, to calculate the number of significant figures in a number there are a set of rules that one has to memorize. So, let’s look into an alternate and easy way to do that. Remember this! 1. The non-zero digits [1,2,3,4,5,6,7,8,9] are always significant. 2. Zero (0) may or may not be significant depending on its occurrence. # Let’s classify different types of zero present in a term. Leading zeros: Let’s call the zeros that are present before first non-zero digit as leading zeros . Examples : 0 23, 00 411, 0.00 16 (the leading zeros are coloured), 0.0 8701 (here only first two zeros are leading zeros) Trailing zeros: Let’s call the zeros that are present after the last non-zero digit as trailing zeros. Examples : 34 0 , 11 00 , 0.0016 00 (the trailing zeros are coloured), 1.401 00 (Here only last two zeros are trailing zeros) Trapped zeros: Let’s call the zeros in between two non-zero digits