scientist, discoveries & inventions MCQ section 1 MCQ Questions & Answers Detailed Explanation

Answer: (d)

The smallpox vaccine was the first successful vaccine to be developed. The process of vaccination was first publicised by Edward Jenner in 1796, who acted upon his observation that milkmaids who caught the cowpox virus did not catch smallpox.

Before the introduction of a vaccine, the mortality of the severe form of smallpox—variola major—was very high. Historical records show that a method of inducing immunity was already known.

A process called inoculation, also known as insufflation or variolation was practised in India as early as 1000 BC.

Answer: (b)

Robert Edwin Peary, Sr. was an American explorer who claimed to have led the first expedition, on April 6, 1909, to reach the geographic North Pole. Peary's claim was widely credited for most of the 20th century, though it was criticized even in its own day.

Answer: (b)

Answer: (b)

There are many claimants to the title of the first company to produce practical transistor radios, often it is attributed to Sony (originally Tokyo Telecommunications Engineering Corporation).

A transistor radio is a small portable radio receiver that uses transistor-based circuitry. Following their development in 1954, they became the most popular electronic communication device in history, with billions manufactured during the 1960s and 1970s.

Their pocket size sparked a change in popular music listening habits, allowing people to listen to music anywhere they went.

Answer: (b)

Answer: (d)

The North Pole is the northernmost point on the Earth, lying diametrically opposite the South Pole. It defines geodetic latitude 90° North as well as the direction of true north.

At the North Pole, all directions point south; all lines of longitude converge there, so its longitude can be defined as any degree value.

Robert Edwin Peary was an American explorer who claimed to have led the first expedition, on April 6, 1909, to reach the geographic North Pole.