Who discovered Arsenic?

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KPTCL Assistant Exam (Mescom) SLOT1 2017 click here to view all questions

Who discovered Arsenic?

AGlenn Seaborg

BAlbert Einstein

CMarie Curie

DAlbertus Magnus

Akilesh Kharvi ? Jul 26 '2017 at 22:4

Answer is : Albertus Magnus

Explanation:

History and Uses: Although arsenic compounds were mined by the early Chinese, Greek and Egyptian civilizations, it is believed that arsenic itself was first identified by Albertus Magnus, a German alchemist, in 1250.

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Vaccination is invented by-

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RRB TC CC Exam (Bangalore) 2006 click here to view all questions

Vaccination is invented by-

AEdward Jennar

BLeuis Pastuer

CWating

DNone of these

Sachin Khr ? Nov 18 '2016 at 20:26

Answer is : Edward Jennar
Smallpox vaccine, the first successful vaccine to be developed, was introduced by Edward Jenner in 1796. He followed up his observation that milkmaids who had previously caught cowpox did not later catch smallpox by showing that inoculated cowpox protected against inoculated smallpox.

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The concept of 'survival of the fittest' was first advocated by-

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RRB ASM Exam (Ajmer) 2007 click here to view all questions

The concept of 'survival of the fittest' was first advocated by-

AOparin

BDarwin

CSpencer

DHaeckel

Sachin Khr ? Nov 19 '2016 at 16:7

Answer is : Spencer

Herbert Spencer first used the phrase, after reading Charles Darwin's On the Origin of Species, in his Principles of Biology (1864), in which he drew parallels between his own economic theories and Darwin's biological ones: \"This survival of the fittest, which I have here sought to express in mechanical terms, is that which Mr. Darwin has called 'natural selection', or the preservation of favoured races in the struggle for life.

Reference: https://en.wikipedia.org/wiki/...

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Who invented optical fibre?

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RRB TA Exam (Chennai) 2008 click here to view all questions

Who invented optical fibre?

ASamuel Cohen

BNarinder Kapany

CPercy L. Spencer

DT.H. Maimah

Nithin K ? Dec 6 '2016 at 22:8

Answer : Narinder Kapany

Explanation:

Kapany was born to a Sikh family in Moga, Punjab, India and was educated in India. In 1952 Kapany conducted studies that led to the invention of optical fibre.

Reference: https://en.wikipedia.org/wiki/Narinder_Singh_Kapany

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