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) Curie
(b) Becqueral
(c) Rutherford
(d) Soddy
The correct answers to the above question in:
Answer: (b)
French physicist Henri Becquerel discovered radioactivity by accident in 1896 when a piece of uranium left in a dark desk drawer made an image on photographic plates.
The husband and wife team of Pierre and Marie Curie became interested in Becquerel’s discovery. While experimenting with their own uranium-containing ore, they came up with the term “radioactivity” to describe the spontaneous emissions that they studied.
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Question : 1
Match List-I with List-II and select the correct answer using the code given below the lists.
| List I | List II |
| A. Dr Raja Ramanna | 1. Plant Chemistry |
| B. Dr M.S. Swaminathan | 2. Nuclear Physics |
| C. Prof. U.R. Rao | 3. Thermodynamics and astrophysics |
| D. Prof. Meghnad Saha | 4. Space research |
| 5. Agricultural science |
a) 2 5 4 3
b) 2 1 4 3
c) 3 5 2 1
d) 2 1 4 3
Answer »Answer: (a)
Question : 2
The National Science Day is observed on February 28 every year to commemorate
a) The successful launch of ASLV
b) Homi J. Bhabha’s birthday
c) Raman-effect day
d) The launch of the first artificial satellite Aryabhatta
Answer »Answer: (c)
Question : 3
Who invented Steam Engine?
a) William Harvey
b) None of the above
c) Robert Watson
d) James Watt
Answer »Answer: (d)
Question : 4
Which of the following machines was designed by Charles Babbage?
a) Punched card
b) Analytical engine
c) Tabulating machine
d) Arithmetic engine
Answer »Answer: (b)
The Analytical Engine was a proposed mechanical general-purpose computer designed by English mathematician Charles Babbage. It was first described in 1837 as the successor to Babbage's Difference Engine, a design for a mechanical computer.
The Analytical Engine incorporated an arithmetic logic unit, control flow in the form of conditional branching and loops, and integrated memory, making it the first design for a general-purpose computer that could be described in modern terms as Turing-complete.
Question : 5
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.
Question : 6
Who among the following is the inventor of ‘X’ rays?
a) Maxwell
b) Torricelli
c) Rutherford
d) Roentgen
Answer »Answer: (d)
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