scientist, discoveries & inventions MCQ section 3 MCQ Questions & Answers Detailed Explanation

Answer: (c)

Ethology is the scientific and objective study of animal behavior, usually with a focus on behavior under natural conditions. The term was first popularized by American myrmecologist (the study of ants) William Morton Wheeler in 1902.

Answer: (a)

The Wright brothers, Orville and Wilbur, were two American brothers, who are credited with inventing and building the world’s first successful airplane on December 17, 1903. From 1905 to 1907, the brothers developed their flying machine into the first practical fixed-wing aircraft.

Answer: (a)

Answer: (a)

Radar is an object detection system that uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.

The radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path.

In 1922 A. Hoyt Taylor and Leo C. Young, researchers working with the U.S. Navy invented Radar.

Answer: (b)

Answer: (d)

The connection between electricity and magnetism was discovered by famous Danish chemist and physicist, Hans Christian Oersted in 1819. Starting about a decade after Oersted’s discovery, Michael Faraday demonstrated essentially the opposite of what Oersted had found–that a changing magnetic field induces an electric current.

He achieved an electrical current from a changing magnetic field, a phenomenon known as electromagnetic induction. Following Faraday’s work, James Clerk Maxwell developed equations, formally unifying electricity and magnetism.

So it was Maxwell who formulated the relationship between electricity and magnetism.