Questions

The man has 12 sons and the 12 sons has each one sister.

=> 12 sons + 1 sister = 13 children.

An area of dead myocardial tissue is called an infarct.

Penchant means habitual liking for something which is nearest in meaning to liking.

RADAR stands for Radio Detection and Ranging.

Radar is a detecting system that uses radio waves to determine the range, angle, or velocity of objects. It operates in the ultra-high-frequency of the radio-frequency (RF) spectrum.

Uses ::

To detect

aircraft,

ships,

spacecraft,

guided missiles,

motor vehicles,

weather formations, and

terrain.