(a) Diamond is used as an abrasive. (b) Al alloy are used to make aircraft body.

The allow 'Alnico' is used for making permanent magnets. It is an alloy of aluminium, nickel, cobalt and iron.

It is indeed very true that precise measurements of physical quantities are essential for the development of science. For example, ultra-shot laser pulses (time interval ∼ 10–15 s) are used...

(a) 1.5 × 1010 cm/sec

(i) Infrared rays (ii) Microwaves.

(d) Mach number, a useful quantity in aerodynamics, is the ratio of air speed to the local speed of sound. The speed of sound varies with temperature. Since temperature and...

(c) Hindustan Aeronautics Limited (HAL) has developed the Dhruv advanced light helicopter (ALH), a light (5.5t class) multirole and multimission helicopter for army, air force, navy, coastguard and civil operations...

(d) INS Sindhughosh (S55) is the lead ship of her class of diesel-electric submarines of the Indian Navy. INS Viraat is a Centaur-class aircraft carrier in service with the Indian...

(d) of the absence of clouds and other weather phenomena

Once on board a flight, Bryson leaned over to tie his shoelaces. At the same moment, someone in the seat in front of him threw his seat back into full...

(a) An alloy is a homogeneous mixture of two or more metals or a metal and a non-metal, mixed in the molten state. Amalgam is an alloy of a metal with...