scientist, discoveries & inventions MCQ section 4 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general awareness mcq - 4 EXERCISES
The following question based on scientist, discoveries & inventions topic of general awareness mcq
(a) S.N. Bose
(b) C.V. Raman
(c) S. Ramanujan
(d) S. Chandrashekhar
The correct answers to the above question in:
Answer: (c)
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Read more scientist discoveries and inventions Based General Awareness Questions and Answers
Question : 1
X-rays were discovered by –
a) Lavoisier
b) Faraday
c) H. Davy
d) Roentgen
Answer »Answer: (d)
X-radiation (composed of X-rays) is a form of electromagnetic radiation. X-rays have a wavelength in the range of 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and energies in the range 100 eV to 100 keV.
They are shorter in wavelength than UV rays and longer than gamma rays.
In many languages, X-radiation is called Röntgen radiation, after Wilhelm Röntgen, who is usually credited as its discoverer, and who had named it X-radiation to signify an unknown type of radiation.
Question : 2
‘Cryogenics’ is the study of
a) Low temperature
b) High temperature
c) Production of fuels
d) Superconductor
Answer »Answer: (a)
In physics, cryogenics is the study of the production and behaviour of materials at very low temperatures.
It is not well-defined at what point on the temperature scale refrigeration ends and cryogenics begins, but scientists assume it starts at or below - 150°C (123 K; -238 °F).
Question : 3
Crescograph was invented by
a) P.C. Mahalanobis
b) S.N. Bose
c) J.C. Bose
d) P.C. Roy
Answer »Answer: (c)
A crescograph is a device for measuring growth in plants. It was invented in the early 20th century by Sir Jagadish Chandra Bose - an Indian polymath, physicist, biologist, botanist, and archaeologist.
Question : 4
‘Telephone’ was invented by
a) Wilson
b) George Stephenson
c) Graham Bell
d) Hoffman
Answer »Answer: (c)
Question : 5
The ‘National Science Day’ is observed on
a) 28 March
b) 28 April
c) 28 January
d) 28 February
Answer »Answer: (d)
Question : 6
Who invented vaccination for 'Small Pox'?
a) Louis Pasteur
b) Sir Fredrick Grant Banting
c) Edward Jenner
d) Sir Alexander Fleming
Answer »Answer: (c)
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.
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