scientist, discoveries & inventions MCQ section 4 Practice Questions Answers Test with Solutions & More Shortcuts
scientist, discoveries & inventions PRACTICE TEST [4 - EXERCISES]
scientist, discoveries & inventions MCQ section 1
scientist, discoveries & inventions MCQ section 2
scientist, discoveries & inventions MCQ section 3
scientist, discoveries & inventions MCQ section 4
Question : 11 [SSC MTS 2014]
Meteorology is the science of:
a) Earthquakes
b) Weather
c) Metals
d) Mateors
Answer »Answer: (d)
Meteorology is the scientific study of the atmosphere or weather. Meteorological phenomena are observable weather events which are explained by the science of meteorology. Those events are bound by the variables that exist in Earth’s atmosphere; temperature, air pressure, water vapor, etc.
Question : 12 [SSC CGL 2011]
Who invented the Jet Engine?
a) Michael Faraday
b) Karl Benz
c) Thomas Savery
d) Sir Frank Whittle
Answer »Answer: (d)
Dr Hans von Ohain and Sir Frank Whittle are both recognized as being the co-inventors of the jet engine. Each worked separately and knew nothing of the other’s work. Hans von Ohain is considered the designer of the first operational turbojet engine.
Frank Whittle was the first to register a patent for the turbojet engine in 1930. Hans von Ohain was granted a patent for his turbojet engine in 1936. However, Hans von Ohain’s jet was the first to fly in 1939. Frank Whittle’s jet first flew in 1941.
Question : 15 [SSC MTS 2014]
The purity of Milk is determined by
a) Thermometer
b) Hydrometer
c) Stalagmometer
d) Lactometer
Answer »Answer: (d)
Lactometer is used to check the purity of milk. The specific gravity of milk does not give a conclusive indication of its composition since milk contains a variety of substances that are either heavier or lighter than water.
The device works on the principle of Archimedes’s principle that a solid suspended in a fluid will be buoyed up by a force equal to the weight of the fluid displaced.
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