Tag: science & technology

Subrahmanyan Chandrasekhar shared the 1983 Nobel Prize in Physics with William Alfred Fowler for their theoretical and experimental studies of the physical processes of importance to the structure and evolution of the stars.

Marie Curie was the first woman to win a Nobel Prize in 1903 for Physics, shared with her husband Pierre Curie and Henri Becquerel for their work on radioactivity. Barbara McClintock won much later (1983, Medicine).

Standard aviation rules state that an aircraft must overtake another aircraft from the right side. This is a fundamental safety rule in aviation to ensure predictable aircraft positioning and avoid collisions. The statement is True.

RADAR, VOR (VHF Omnidirectional Range), and GPS are all commonly used navigation aids in modern aircraft. SONAR (Sound Navigation and Ranging) is used underwater for submarines and ships, not for aircraft navigation. Therefore, SONAR (Option C) is the correct answer as it is NOT an aircraft navigation aid.

This statement refers to wake turbulence - the disturbed air left behind an aircraft. When a plane takes off, it creates wake vortices. If another plane takes off shortly after and encounters these vortices, it can experience unexpected movements or responses. This is a real aviation hazard, and proper separation times are maintained between takeoffs to avoid this. The statement is True.

When landing gear is retracted in an aircraft, the wheels and struts fold up into the wheel wells. To maintain aerodynamic smoothness, the undercarriage doors (which cover these wheel wells) must close after the gear is fully retracted. This completes the retraction process. The flaps, slats, and gear itself are separate components. Option B (Closing of Under Carriage door) is correct.

The Concorde crash (Flight 4590 on July 25, 2000) was caused by a titanium strip debris on the runway from a Continental Airlines DC-10 that punctured a Concorde tire, sending debris into the fuel tank and igniting a fire. None of the listed options (Reverse Thrust Generator Failure, Fuel Cross Feed Failure, or Horizontal Stabilizer Failure) describe the actual cause.

Brass is a metallic alloy composed primarily of copper and zinc, widely used in musical instruments, plumbing fixtures, and decorative items due to its durability and gold-like appearance.

Fish breathe through gills, which are specialized organs that extract dissolved oxygen from water and release carbon dioxide, allowing them to survive underwater.

Woodpeckers have zygodactyl feet with two toes facing forward and two backward, providing the grip and leverage needed to climb vertical tree trunks while searching for insects.