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) Lavoisier
(b) Faraday
(c) H. Davy
(d) Roentgen
The correct answers to the above question in:
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.
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Question : 1
‘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 : 2
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 : 3
Who invented the mobile phone?
a) Martin Cooper
b) Tim–Berners–Lee
c) Chuck Hull
d) Raymond Samuel Tomlinson
Answer »Answer: (a)
Martin Cooper, an American engineer, conceived the first handheld mobile phone while at Motorola in 1973. He led the team that developed it and brought it to market in 1983. He is considered the “father of the cell phone” and is also cited as the first person in history to make a handheld cellular phone call in public.
Question : 4
A recent movie titled The Man Who Knew Infinity is based on the biography of
a) S.N. Bose
b) C.V. Raman
c) S. Ramanujan
d) S. Chandrashekhar
Answer »Answer: (c)
Question : 5
‘Telephone’ was invented by
a) Wilson
b) George Stephenson
c) Graham Bell
d) Hoffman
Answer »Answer: (c)
Question : 6
The ‘National Science Day’ is observed on
a) 28 March
b) 28 April
c) 28 January
d) 28 February
Answer »Answer: (d)
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