EDUcat

  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

  The consistent beating of heart is the very basic process, which keeps all of us alive on this beautiful planet. Unfortunately, some people develop heart problems in their old age. This makes their heart beat slower and inconsistent. It happens due to problems in the sinoatrial node. Sinoatrial node is a part of heart, which sends electrical signals to heart. These electrical signals are vital to make the heart function properly. In order to make heartbeats consistent, pacemaker is used. Pacemaker is a device with the following components. 1. A battery 2. A microprocessor control switch 3. An RC circuit Let us understand how this pacemaker works. The battery charges the capacitor present in the RC circuit. Then, a computer-controlled switch disconnects the battery and connects the charged capacitor with the heart by a wire. This gives a pulse to the heart and it regains the desired beating frequency. After the capacitor is discharged, the computer-controlled switch disconnects the R