Questions

PFD's : Personal Flotation Devices (life jackets).

It is a legal requirement for a PFD to

1. Must be in good, serviceable condition 

2. PFDs must be properly sized for the intended wearer.

3. Sizing for PFDs is based on body weight and chest size.

Hydroplaning is caused by a combination of standing water on the road, car speed, and under-inflated or worn-out tires.

Charles Macintosh (29 December 1766 – 25 July 1843) was a Scottish chemist and inventor of waterproof fabrics.He devoted all his spare time to science, particularly chemistry, and before he was twenty resigned his clerkship to take up the manufacture of chemicals. In this he was highly successful, inventing various new processes. His experiments with one of the by-products of tar, naphtha, led to his invention of waterproof fabrics.

Jayaprakash Narayan was an Indian independence activist, theorist, socialist and political leader who is popularly known as Lok Nayak.

The coding or scrambling of data so that humans cannot read them is known as encryption.

The launch of the first rocket from TERLS or Thumba Equatorial Rocket  Launching Centre.