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 : 23 [SSC CML (Pre) 2000]
Who invented Portland Cement?
a) Percy L. Spencer
b) Leonardo da Vinci
c) Joseph Aspdin
d) Denis Gason
Answer »Answer: (c)
Joseph Aspdin, a British bricklayer from Leeds, is considered to be the originator of Portland cement. A process for the manufacture of Portland cement was patented in 1824.
This cement was an artificial cement similar in properties to the material known as "Roman cement.” Aspdin's process was similar to a process patented in 1822 and used since 1811 by James Frost who called his cement "British Cement".
Question : 24 [SSC Stenographer 2016]
Infrared radiations are detected by
a) Spectrometer
b) Pyrometer
c) Photometer
d) Nanometer
Answer »Answer: (c)
A photometer is an instrument that can be used for absorption, emission or fluorescence measurement with ultraviolet, visible or infrared radiation. It has filters for wavelength selection and a photoelectric device for measuring radiation (Detection and Analysis by E. N. Ramsden).
Question : 25 [SSC CGL (Pre) 2005]
Who is recognised as the Father of Geometry ?
a) Rene Descartes
b) Pythagoras
c) Johann Kepler
d) Euclid
Answer »Answer: (d)
Euclid, also known as Euclid of Alexandria, was a Greek mathematician, often referred to as the “Father of Geometry”.
He was active in Alexandria during the reign of Ptolemy I (323–283 BC). Euclid deduced the principles of what is now called Euclidean geometry from a small set of axioms. Euclid also wrote works on perspective, conic sections, spherical geometry, number theory and rigour.
Although many of the results in Elements originated with earlier mathematicians, one of Euclid’s accomplishments was to present them in a single, logically coherent framework, making it easy to use and easy to reference, including a system of rigorous mathematical proofs that remains the basis of mathematics 23 centuries later.
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 »