scientist, discoveries & inventions MCQ section 1 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) Lar Strauss
(b) Gillette
(c) Steve Job
(d) Steve Cher
The correct answers to the above question in:
Answer: (b)
King Camp Gillette, an American businessman, invented the best selling version of the safety razor in 1901. Several models were in existence before Gillette’s design.
Gillette’s innovation was the thin, inexpensive, disposable blade of stamped steel. Gillette is widely credited with inventing the so-called razor and blades business model.
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Read more scientist discoveries and inventions Based General Awareness Questions and Answers
Question : 1
An instrument used to measure the density of milk is
a) Polarimeter
b) Glactometer
c) Calciometer
d) Lactometer
Answer »Answer: (d)
Lactometer is used for measuring the density (creaminess) of milk. It is essentially a hydrometer which is an instrument used to measure the specific gravity (or relative density) of liquids; that is, the ratio of the density of the liquid to the density of water.
Question : 2
An eudiometer measures
a) Vapour pressure
b) Atmospheric pressure
c) Volume of gases
d) Time
Answer »Answer: (c)
A eudiometer is a laboratory device that measures the change in volume of a gas mixture following a physical or chemical change. Applications of a eudiometer include the analysis of gases and the determination of volume differences in chemical reactions.
It is similar in structure to the meteorological barometer.
Question : 3
Which instrument is used for photographing the Sun?
a) Spectroheliograph
b) Galvanometer
c) Spectrophotometer
d) Potentiometer
Answer »Answer: (a)
The spectroheliograph is an instrument used in astronomy which captures a photographic image of the Sun at a single wavelength of light, a monochromatic image. The wavelength is usually chosen to coincide with an spectral wavelength of one of the chemical elements present in the Sun.
Question : 4
Anemometer is an instrument meant for measuring
a) temperature
b) velocity
c) wind speed
d) air masses
Answer »Answer: (c)
An anemometer is a device used for measuring the speed of wind. Anemometers are important tools for meteorologists, who study weather patterns. They are also important to the work of physicists, who study the way air moves.
Question : 5
Who was the leader of the team that developed the ‘Web Browser’ known as Mosaic?
a) Tim Berners-Lee
b) Marc Anderssen
c) Paul Mockapetris
d) Bob Kahn
Answer »Answer: (b)
Mosaic is the web browser credited with popularizing the World Wide Web. Marc Andreessen is best known as the co-author of Mosaic, the first widely used Web browser.
He is one of only six inductees in the World Wide Web Hall of Fame announced at the first international conference on the World Wide Web in 1994.
Question : 6
Electron was discovered by
a) Albert Einstein
b) Ernest Rutherford
c) Joseph Thomson
d) Max Planck
Answer »Answer: (c)
The electron is a subatomic particle with a negative elementary electric charge. An electron has a mass that is approximately 1/1836 that of the proton.
The intrinsic angular momentum (spin) of the electron is a half-integer value in units of h, which means that it is a fermion. Like all matter, they have quantum mechanical properties of both particles and waves, so they can collide with other particles and can be diffracted like light.
The electron was identified as a particle in 1897 by J. J. Thomson and his team of British physicists.
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