scientist, discoveries & inventions MCQ section 3 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 : 6 [SSC CHSL 2015]
The term Ecosystem was proposed by:
a) Thienemann
b) Vernadsky
c) A.G. Tansley
d) S.A. Forbes
Answer »Answer: (c)
The term “ecosystem” was first coined by Roy Clapham in 1930, but it was ecologist Arthur Tansley who fully defined the ecosystem concept.
In his classic article of 1935, Tansley defined ecosystems as “The whole system,… including not only the organism complex but also the whole complex of physical factors forming what we call the environment.”
Question : 7 [SSC CHSL 2015]
Who discovered the link between electricity and magnetism ?
a) Michael Faraday
b) Volta
c) Diesel
d) Maxwell
Answer »Answer: (d)
The connection between electricity and magnetism was discovered by famous Danish chemist and physicist, Hans Christian Oersted in 1819. Starting about a decade after Oersted’s discovery, Michael Faraday demonstrated essentially the opposite of what Oersted had found–that a changing magnetic field induces an electric current.
He achieved an electrical current from a changing magnetic field, a phenomenon known as electromagnetic induction. Following Faraday’s work, James Clerk Maxwell developed equations, formally unifying electricity and magnetism.
So it was Maxwell who formulated the relationship between electricity and magnetism.
Question : 9 [SSC CGL 2000]
Who invented Radar?
a) A. H. Taylor and Leo C. Young
b) J. H. Van Tassel
c) P. T. Farnsworth
d) Wilhelm K. Roentgen
Answer »Answer: (a)
Radar is an object detection system that uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.
The radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path.
In 1922 A. Hoyt Taylor and Leo C. Young, researchers working with the U.S. Navy invented Radar.
Question : 10 [SSC CGL 2015]
Who discovered the first antibiotic ?
a) A Fleming
b) W Fleming
c) Louis Pasteur
d) C Waksman
Answer »Answer: (a)
Sir Alexander Fleming discovered the world’s first antibiotic— benzylpenicillin (Penicillin G)—from the mould Penicillium notatum in 1928. For this discovery, he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Boris Chain.
IMPORTANT general awareness mcq EXERCISES
scientist, discoveries & inventions Shortcuts »
Click to Read...scientist, discoveries & inventions MCQ section 3 Online Quiz
Click to Start..scientist, discoveries & inventions Shortcuts and Techniques with Examples
indian general awareness MCQ CATEGORIES
RECENT BLOGS
Recently Added Subject & Categories For All Competitive Exams
100+ Quadratic Equation Questions Answers PDF for Bank
Quadratic Equation multiple choice questions with detailed answers for IBPS RRB SO. more than 250 Attitude practice test exercises for all competitive exams
Continue Reading »
IBPS Aptitude Linear Equations MCQ Questions Answers PDF
Linear equations multiple choice questions with detailed answers for IBPS RRB SO. more than 250 Attitude practice test exercises for all competitive exams
Continue Reading »
New 100+ Compound Interest MCQ with Answers PDF for IBPS
Compound Interest verbal ability questions and answers solutions with PDF for IBPS RRB PO. Aptitude Objective MCQ Practice Exercises all competitive exams
Continue Reading »
100+ Mixture and Alligation MCQ Questions PDF for IBPS
Most importantly Mixture and Alligation multiple choice questions and answers with PDF for IBPS RRB PO. Aptitude MCQ Practice Exercises all Bank Exams
Continue Reading »