GK Question On Invention and their Inventor.

Invention
Inventor
Aeroplane
Wright brothers
Air Brake
George Westinghouse
Air Pump
Otto von Guericke
Airship (rigid)
G. Ferdinand Von Zeppelin
Aniline Dyes
Hoffman
Antiseptic Surgery
Lord Joseph Lister
Arc Lamp
C. F. Brush
Archimedean Screw
Archimedies
Atom
Neils Bohr
Atomic Number
Mosley
Atomic Physics
Enrico Fermi
Atomic Structure
Bohr and Rutherford
Atomic Theory
Dalton
Automatic gearbox
Hermann Fottinger
Automobile
Daimler
Automobiles using gasoline
Karl Benz
Avogadro’s Hypothesis
Avogadro
Bacteriology
Robert Koch
Bacteriophage
Max Delbruck
Bakelite
Leo H Baekeland
Balloon
Jacques and Joseph Montgolfier
Ball-Point Pen
John J. Loud
Barometer
Evangelista Torricelli
Behaviorism
B. F. Skinner
Beri – Beri
Eijkman
Bicycle
Kirkpatrick Macmillan
Bicycle Tyre
J.B. Dunlop
Bifocal Lens
Benjamin Franklin
Binomial Nomenclature
Carl Linnaeus
Biogenetic Principle
Ernst Haeckel
Bismuth
Valentine
Blood Circulation
Harvey
Blood Groups
Karl Landsteiner
Bomb
Edward Teller
Boson
S.N.Bose
Boyle’s law
Boyle
Braille
Louis Braille
Breaking up the Nucleus of an atom
Rutherford
Calculating machine
Pascal
Camera
George Eastman
Carburetor
Gottlieb Daimler
Carburettor
Gottlieb Daimler
Cash register
William Burroughs
Cell Doctrine
Rudolf Virchow
Celluloid
A.Parker
Cement
Joseph Aspdin
Cenema
A.L. and J.L. Lumiere
Centrigrade scale
A. Celsius
Chemical Structure
August Kekule
Chemotherapy
Paul Ehrlich
Child Development
Jean Piaget
Chloroform
James Harrison and James Young Simpson
Cholera Bacillus
Robert Koch
Chromosomal Theory of Heredity
Thomas Hunt Morgan
Chronometer
John Harrison
Cine camera
Friese-Greene
Cinematograph
Thomas Alva Edison
Cinematography
Thomas Alva Edison
Circulation of the Blood
William Harvey
Classical Field Theory
Michael Faraday
Clock (machanical)
Hsing and Ling-Tsan
Clock (pendulum)
C. Hugyens
Coloured Photography
Lippman
Computer
Charles Babbage
Continental Drift
Alfred Wegener
Cosmic Rays
R.A.Millikan
Crescograph
J.C.Bose
Crystal Dynamics
C.V.Raman
Cyclotron
Lawrence
D.D.T.
Dr.Paul Muller
Deciphering the genetic code
Dr.Hargobiad Khorana
Deuterium (Heavy Water)
H.C.Urey
Diesel Engine
Rudolf Diesel
Diesel Oil Engine
Rudolf Diesel
Difference engine
Charles Babbage
Electrons
J.J.Thomson
Laws of Planetary Motion
Kepler
North Pole
Robert Peary (1909)
Solar System
Copernicus (1540)
South Pole
Amundson (1912)
Specific Gravity
Archimedes
West Indies
Columbus (1492)
Drinker’s Chamber of Iron Lung
Dr.Philip Drinker
Dynamical theory of Heat
Lord Kelvin
Dynamite
Alfred B. Nobel
Dynamo
Michael Faraday
Effect of Pressure on trough bodies
Meghnad Saha
Eightfold Way
Murray Gell-Mann
Electric Battery
Alessandro Volta
Electric Flat Iron
H. W. Seeley
Electric Furnace
William Siemens
Electric Generator
Michael Faraday
electric guitar
Adolph Rickenbacker
Electric iron
H.W. Seeley
Electric Lamp
Thomas Alva Edison
Electric Measurement
Gauss
Electric Motor (AC)
Nikola Tesla
Electric razor
Jacob Schick
Electrical Waves
Heitz
Electricity
Faraday
Electromagnet
William Sturgeon
Electromagnetic Field
James Clerk Maxwell
Electromagnetic Theory
Maxwell
Electron
Joseph J. Thomson
Electron Theory
Bohr
Electronic Computer
Dr. Alan M. Turing
Elevator
Elisha G. Otis
Energy of the Sun
Hans Bethe
Equal sign (=)?
Robert Recorde
Ethology
Konrad Lorenz
Eugenics
Francis Galton
Evolution
Charles Darwin
Evolution (theory)
Charles Darwin
Evolutionary Theory
Ernst Mayr
Fahrenheit Scale
Fahrenheit
Film & Photographic goods
Kodak
Film (with sound)
Dr. Lee de Forest
Foundations of Biology
Jean Baptiste Lamarck
Foundations of Mathematics
Euclid
Founding of Modern Physiology
Claude Bernard
Founding of Psychology
Wilhelm Wundt
Fountain Pen
Lewis E. Waterman
Fundamental Laws of Electric Attraction
Coulomb
Galvanometer
Andre-Marie Ampere
Gas lighting
William Murdoch
Gasoline engine
Karl Benz
Genetic Code
Frederick Sanger
Geometry
Euclid
Germ Theory of Disease
Louis Pasteur
Glider
Sir George Caley
Gramophone
Thomas Alva Edison
Gun powder
Rogei Bacon
Heavens
William Herschel
Heavy Hydrogen
Urey
Helicopter
Broquett
Heliocentric Universe
Nicolaus Copernicus
Helium Gas
Lockyer
Homoeopathy
Hahnemann
Hovercraft
Christopher Cockerell
Human Sexuality
Alfred Kinsey
Hydrogen
Cavendish
Hydrophobia
Louis Pasteur
I.Q. Test
Alfred Binet
In Number Theory
Ramanujam
Incandescent Bulb
Edison
Induction Coil
Rohm Korff
Induction of Electric Current
Faraday
Insulin
F.Banting
Intelligence test
Binet
Internal Combustion Engine
Otto
Jeans
Levi Strauss
Jet Engine
Sir Frank Whittle
Jet Propulsion
Frank Whittle
Kala-azar Fever
U.N.Brahmachari
Kaleidoscope
David Brewster
Laboratory Gas Burner
Robert Wilhelm Von Bunsen
Laughing Gas
Priestley
Law of Electrolysis
Faraday
Law of gases
Gay Lussac
Laws of Electrical Resistance
Ohm
Laws of Gravitation
Newton
Laws of Heredity
Gregory Mandel
Laws of Inheritance
Gregor Mendel
Laws of Motion
Newton
Laws of Multiple Proportion
Dalton
Laws of Natural Selections
Darwin
Life Boat
Henry Great Head
Lift
E.G. Otis
Lift (Elevators)
Otis
Lightning Conductor
Benjamin Franklin
Line of demarcation (ship)
Plimsoll
Linotype
Mergenthaler
Liquid Oxygen
Dewar
Locomotive
Richard Trevithick
Logarithmic Tables
John Napier
Logarithms
John Napier
Machine Gun
Dr. Richard Gatling
Malarial Parasite
Ronald Ross
Match (safety)
J.E. Lurdstrom
Mathematical Astro Physics
Chandrasekhar
Mathematical Genius
Carl Gauss (Karl Friedrich Gauss)
Mauve dye
Perkin
Measurement of Electrical Energy
Joule, James Prescoft
Mechanical Equivalent of Heat
Joules
Mercury Thermometer
Fahrenheit
Meson
Hideki Yakawa
Microphone
Johann Phillip Reis, Alexander Graham Bell, Elisha Gray, Amos E. Dolbear, and Thomas Edison
Microscopic Anatomy
Marcello Malpighi
Modern Anthropology
Franz Boas
Modern Astronomy
Arthur Eddington
Modern Computer
John von Neumann
Modern Geology
Charles Lyell
Modern Physiology
William Bayliss
Modern Synthesis
Theodosius Dobzhansky
Modern Telescope
Edwin Hubble
Molecular Biology
Francis Crick
Molecular Scattering of light in fluid
Ramanathan
Montessori Method
Maria Montessori
Motion of the Planets
Johannes Kepler
Motor Car (petrol)
Karl Butler
Movie Projector
Thomas Alva Edison
Neon Gas
Ramsay, Travers
Neon-lamp
G. Claude
Neurophysiology
Charles Sherrington
Neutron
Chadwick
New Anatomy
Andreas Vesalius
New Astronomy
Tycho Brahe
New Science
Galileo Galilei
Newtonian Mechanics
Pierre Simon de Laplace
Newtonian Revolution
Isaac Newton
Nuclear Fission
Otto Hahn, Bohr and Fermi
Nylon
Dr. Wallace H. Carothers
Nylon Plastic
Carothers
Organic Chemistry
Emil Fischer
Origin of Species
Charles Darwin
Oxygen
Priestly
Paints
Shalimar
Paper clip
Johann Vaaler
Parking meter
Carlton Mcgee
Penicillin
Alexander Fleming
Periodic Law
Mendeleef
Periodic Table of Elements
Dmitri Mendeleev
Pharmacology
Gertrude Belle Elion
Phonograph
Edison
Photograph
Dauguerre
Photography (paper)
W.H. Fox Tablot
Phototherapy
N.R.Finsen
Pneumatic Tyres
John Boyd Dunlop
Positive Electrons
Anderson
Power Loom
Edmund Cartwright
Powerloom
Cartwright
Principle for lever (S.P.Gravity)
Archimedes
Printing for the Blind
Braille
Printing Press
Johannes Gutenberg
Psycho-analysis
Dr.Sigmund Freud
Psychology of the Unconscious
Sigmund Freud
Quanta
Max Planck
Quantum Cosmology
Stephen Hawking
Quantum Electrodynamics
Richard Feynman
Quantum Mechanics
Max Born
Quantum Theory
Werner Heisenberg
Quantum Theory
Max plank
Raazor (safety)
K.G. Gillete
Rabies Vaccine
Louis Pasteur
Radar
Dr. A.H. Taylor and L.C. Young
Radio
G. Marconi
Radio transmitter
Alexanderson
Radioactive Dating
Willard Libby
Radioactivity
Marie Curie
Radio-activity of Uranium
Henry Becquerel
Radium
Madame Curie
Railway Engine
Stephenson
Raincoat
Charles Macintosh
Raman effect
C.V.Raman
Rare Gas
Cavandish
Rayon
American Viscose Co.
Razor (electric)
Col. J. Schick
Refrigerator
James Harrison, Alexander Catlin
Replacing human heart
Christian Barnard
Revolution in Chemistry
Antoine Laurent Lavoisier
Revolver
Samuel Colt
Rise of German Science
Hermann von Helmholtz
rubber (vulcanized)
Charles Goodyear
Rubber (waterproof)
Charles Macintosh
Safety lamp
Sir Humphrey Davy
Safety Pin
William Hurst
Safety Razor
King C. Gillette
Salk Vaccine
Salk
Saxophone
Antoine Joseph Sax
Scientific astronomy
Hippalus
Scientific Thinking
Lucretius
Scooter
G. Bradshaw
Seismograph
Roberts Mallet
Sewing Machine
Thomas Saint
Sextant
Hadley
Ship (steam)
J.C. Perier
Ship (turbine)
Sir Charles Parsons
Shorthand
Sir Isaac Pitman
Sociobiology
Edward O. Wilson
Soviet Genetics
Trofim Lysenko
Space flying
Braun, Dr.Wernher Von
Spectroscope
Bunsen
Spectroscopy
Gustav Kirchhoff
Spinning frame
Sir Richard Arkwight
Spinning jenny
James Hargreaves
Stainless Steel
Harry Brearley
Steam boat
Fulton
Steam Engine
James Watt
Steam engine (condenser)
James Watt
Steam engine (piston)
Thomas Newcome
Steam Turbine
Parsons
Steel Melting Process
Bessemer
Steel production
Henry Bessemer
Stethoscope
Dr. William Stokes, Rene Laennec
Stress Concept
Hans Selye
Structural Anthropology
Claude Levi-Strauss
Structure of DNA
James Watson
Structure of the Atom
Ernest Rutherford
Submarine
David Bushnell
Sulpha Drugs
Domagk
Superconductivity
Heike Kamerlingh
Symbiosis Theory
Lynn Margulis
Symbol (x)?
William Oughtred
T.N.T.
llly Brandt
Talkies
Lee-de-Frost
Tank
Sir Ernest Swington
Telegraph
Samuel Morse
Telegraphic Code
Samuel Morse
Telephone
Sir Alexander Graham Bell
Telescope
Galileo
Television
Baird
Television (mechanical)
John Logie Baird
Tempo of Evolution
George Gaylord Simpson
Terylene
J. Whinfield and H. Dickson
The long playing microgroove record
Peter Goldmark
Theory of conditioned reflex
Pavlov
Theory of Evolution
Darwin
Theory of Relativity
Einstein
Theory of the Atom
John Dalton
Thermodynamics
Ludwig Boltzmann
Thermometer
Galileo Gallei
Thermos Flasks
Dewar
Tractor
J. Froelich
Transformer
Michael Faraday
Transistor
Bardeen, Shockley, Brattain
Typewriter
C. Sholes
Uranium fusion
Oho Hahn
Uranus (Planet)
Herschel William
Vaccination
Edward Jenner
Valve of radio
Sir J.A. Fleming
Vitamins
Hopkins and Funk
Vitamin A
Elmer V. McCollum and M. Davis
Vitamin B
Elmer V. McCollum
Vitamin B1
Casimir Funk
Vitamin B2
D. T. Smith, E. G. Hendrick
Vitamin Niacin
Conrad Elvehjem
Vitamin Folic acid
Lucy Wills
Vitamin B6
Paul Gyorgy
Vitamin C
James Lind
Vitamin D
Edward Mellanby
Vitamin E
Herbert Evans and Katherine Bishop
Vulcanised Rubber
Charles Goodyear
Washing Soda
Lablanc
Watch
A.L. Breguet
Waterproof Rubber
Charles Macintosh
Wave Mechanics
Erwin Schrodinger
Wave Theory of Light
Christiaan Huygens
Wave/Particle Duality
Louis Victor de Broglie
Wireless Communication
Oliver Lodge
Wireless Telegraphy
Marcony
World Wide Web and Hypertext Markup Language
Tim Berners Lee
X – Rays
Roentgen
X-ray
Wilhelm Reontgen
X-ray Crystallography
Max von Laue
zerox machine
Chester Carlson
Zip fastener
W. L. Judson
Zipper
B. F. Goodrich

A father said to his son I was as old as you are at the present

  1. A father said to his son, "I was as old as you are at the present at the time of your birth". If the father's age is 38 years now, the son's age five years back was:
  1. A. 14 years
  2. B. 19 years
  3. C. 33 years
  4. D. 38 years
  1. Answer & Explanation:
    Suppose the son's current age is x years. Then, (38 - x) = x
    ⇒  2x = 38.
     ⇒ x = 19.
     Son's age 5 years back (19 - 5) = 14 years
  1. Related Question:
  1. At present, the sum of ages of 4 people is 76. After 7 years, the ratio will be 7:6:5:8. Find out the present age of C?
  1. A. 12
  2. B. 11
  3. C. 17
  4. D. 13
  1. Answer : D ( 13 )

  1. In a class, there are 20 boys whose average age is decreased by 2 months, when one boy age 18 years is replaced by a new boy. The age of the new boy is
  1. A. 14 years 8 months
  2. B. 16 yews 4 months
  3. C. 15 years
  4. D. 17 years 10 months
  1. Answer : A ( 14 years 8 months )

  1. Jayesh is as much younger to Anil as he is older to Prashant. If the sum of the ages of Anil and Prashant is 48 years. What is the age of Jayesh?
  1. A. 20 years
  2. B. 24 years
  3. C. 30 years
  4. D. Cannot be determined
  1. Answer : B ( 24 years )

  1. Four years ago, the father’s age was three times the age of his son. The total of the ages of the father and the son after four years, will be 64 years. What is the father’s age at present?
  1. A. 32
  2. B. 33
  3. C. 36
  4. D. 38
  1. Answer : C ( 36 )

  1. A father's age is three times the sum of the ages of his two children, but 20 years hence his age will be equal to the sum of their ages. Then the father's age is
  1. A. 30 years
  2. B. 40 years
  3. C. 35 years
  4. D. 45 years
  1. Answer : A ( 30 years )

  1. The ratio of the ages of the father and the son at present is 7:1. After 4 years, the ratio will become 4:1. What is the sum of the present ages of the father and the son?
  1. A. 29 years
  2. B. 35 years
  3. C. 32 years
  4. D. None of these
  1. Answer : C ( 32 years )

  1. In a cricket 11, the average age of 11 players is 28 years. Out of these, the average ages of three groups of three players each are 25 years, 28 years and 30 years, respectively. If in these groups, the captain and the youngest player are not included and the captain is eleven years older than the youngest player, what is the age of the captain?
  1. A. 33 years 
  2. B. 34 years 
  3. C. 35 years 
  4. D. 36 years 
  1. Answer : C ( 35 years  )

  1. The present ages of three persons in proportions 4 : 7 : 9. Eight years ago, the sum of their ages was 56. Find their present ages (in years).
  1. A. 8, 20, 28
  2. B. 16, 28, 36
  3. C. 20, 35, 45
  4. D. None of these
  1. Answer : B ( 16, 28, 36 )

  1. The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class, thereby decreasing the average by 4 years. The original strength of the class was
  1. A. 10
  2. B. 11
  3. C. 12
  4. D. 15
  1. Answer : C ( 12 )

  1. The total age of A and B is 12 years more than the total age of B and C. C is how many years younger than A?
  1. A. C is younger than A
  2. B. 6
  3. C. 12
  4. D. 24

  1. Answer : C ( 12 )

The speed of a boat when travelling downstream is 32 km/h, whereas

  1. The speed of a boat when travelling downstream is 32 km/h, whereas when travelling upstream it is 28 km/h. What is the speed of the boat in still water?
  1. A. 27 km/h
  2. B. 29 km/h
  3. C. 31 km/h
  4. D. Cannot be determined
  1. Answer & Explanation:

    Suppose the speed of boat in still water is x km/h and speed of stream is y km/h
    Speed of boat in downstream = (x + y) km/h
    x + y = 32 …(i)
    Speed of boat in upstream = (x – y) km/h
    x – y = 28 …(ii)
    Add. Eqs. (i) and (ii),
    we get
    2x = 60 x = 30 km/h
  1. Related Question:
  1. In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
  1. A. 3 km/hr
  2. B. 5 km/hr
  3. C. 8 km/hr
  4. D. 9 km/hr
  1. Answer : C ( 8 km/hr )

  1. A boat running upstream takes 7 hours 48 minutes to cover a certain distance while it takes 4 hours to cover the same distance running downstream. What is the ratio between speed of the boat and the speed of water current respectively ?
  1. A. 37 : 14
  2. B. 41 : 16
  3. C. 52 : 18
  4. D. 59 : 19
  1. Answer : D ( 59 : 19 )

  1. A man rows a boat at 8 km upstream in 2 hours and 2 km downstream in 40 minutes. How long will he take to reach 7 km in still water?
  1. A. 2 hrs
  2. B. 4 hrs 15 min
  3. C. 6 hrs
  4. D. 7 hrs 40 min
  1. Answer : A ( 2 hrs )

  1. A man rows 40 km downstream and 22 km upstream taking 5 hours each time. What is the velocity of the current ?
  1. A. 1.8 km/h
  2. B. 1.9 km/h
  3. C. 2.3 km/h
  4. D. 2.7 km/h
  1. Answer : A ( 1.8 km/h )

  1. A boat takes 90 mins less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is
  1. A. 4
  2. B. 3
  3. C. 2.5
  4. D. 2
  1. Answer : D ( 2 )

  1. A boat goes 24 km upstream and 28 km downstream in 6 hrs. If it goes 30 km upstream and 21 km downstream in 6 hrs and 30 mins, find the speed of the steam.
  1. A. 10 km/hr
  2. B. 5 km/hr
  3. C. 4 km/hr
  4. D. 6 km/hr
  1. Answer : C ( 4 km/hr )

  1. At his usual rowing rate, Rahul can travel 12 miles downstream in a certain river in 6 hrs less than it takes him to travel the same distance upstream. But if he could double his usual rowing rate for this 24mile round trip, the downstream 12 miles would then take only one hour less than the upstream 12 miles. What is the speed of the current in miles per hour?
  1. A. 7/3
  2. B. 4/3
  3. C. 5/3
  4. D. 8/3
  1. Answer : D ( 8/3 )

  1. A and B in boat B1 challenge C and D in boat B2 in a race of 50 km. A and B take turns to row the stretches of 6 km and A begins. C and D take turns to row an hour and C begins. A and C can each row 5 km/hr, B and D each can row only 5(1/2) km/hr. Which boat wins and by what time?
  1. A. B1 wins by 2 mins
  2. B. B2 wins by 1(7/11) mins
  3. C. Both reach the finishing spot together
  4. D. B1 wins by 5(4/11)
  1. Answer : B ( B2 wins by 1(7/11) mins )

  1. In a stream that is running at 2 km/hr, a man goes 10 km upstream and comes back to the starting point in 55 mins. Find the speed of the man in still water.
  1. A. 20 km/hr
  2. B. 22 km/hr
  3. C. 24 km/hr
  4. D. 28 km/hr
  1. Answer : B ( 22 km/hr )

  1. A boatman goes 2 km against the current of the stream in 1 hr and goes 1 km along the current in 10 mins. How long will he take to go 5 km in stationary water?
  1. A. 1 hr
  2. B. 1 hr 15 mins
  3. C. 1(1/2) hrs
  4. D. 40 mins

  1. Answer : B ( 1 hr 15 mins )

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