ISRO Technician-B Fitter Question Paper - 2016 (Set - 1) with Answer Key

Well it’s not possible to write the EXACT value of Pi as it’s an irrational number. The value of Pi is obtained by finding the value of (circumference/diameter) of any circle of radius ‘r’, r>0. Pi is an irrational number and the list would go on till infinity. For calculation purposes in daily life we use, it’s value as 3.14 or 3.1416.

An ammeter (from Ampere Meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters.

A compass points north because all magnets have two poles , a north pole and a south pole, and the north pole of one magnet is attracted to the south pole of another magnet. (You may have seen this demonstrated by a pair of simple bar magnets or refrigerator magnets pushed end to end.)
The Earth is a magnet that can interact with other magnets in this way, so the north end of a compass magnet is drawn to align with the Earth's magnetic field. Because the Earth's magnetic North Pole attracts the "north" ends of other magnets, it is technically the "South Pole" of our planet's magnetic field.

Water has its maximum density of 1g/cubic centimeter at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less then 1 g/cubic centimeter. Water has the maximum density of 1 g/cubic centimeter only when it is pure water.