Discoveries & Inventions

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61 The growth of bacteria is measured by which of the following:

A
hemacytometer
B
spectrophotometer
C
calorimeter
D
auxanometer

62 Air conditioner was discovered by

A
Edison
B
Wilson
C
Carrier
D
Roentgen

63 D.D.T. was invented by

A
Paul Muller
B
John Dalton
C
Rudolf
D
None of these

64 Who is the father of cellular phone ?

A
Linus Torvalds
B
Percy Lebaron Spencer
C
Fred Morrison
D
Martin Cooper

65 Who built the first modern motorcar ?

A
Henry Ford
B
Karl Benz
C
Daimler
D
Henry Austin

66 For which invention is Otto Hahn famous?

A
Atom bomb
B
Television
C
X-rays
D
Miner’s safety lamp

67 Who invented the Jet Engine?

A
Karl Benz
B
Sir Frank Whittle
C
Thomas Savery
D
Michael Faraday

68 Who discovered Solar System ?

A
Newton
B
John Hadley
C
Copernicus
D
Galileo

69 Who discovered electromagnetic nature of light ?

A
Snell
B
Newton
C
Maxwell
D
Young

70 Who Invented Worldwide Standard Time Zones ?

A
Charles Richard Drew
B
Henry W. Seely
C
Jesse Wilford Reno
D
Sir Sandford Fleming

71 Who discovered radioactivity?

A
Max Planck
B
James Clerk Maxwell
C
Henri Becquerel
D
Heinrich Hertz

72 ‘Cryogenics’ is the study of :

A
High temperature
B
Superconductor
C
Production of fuels
D
Low temperature

73 Radio activity was discovered by :

A
Becqueral
B
Soddy
C
Rutherford
D
Curie

74 Who invented aeroplane ?

A
Edison
B
Stevenson
C
Hoffman
D
Wright Brothers

75 The purity of Milk is determined by which of the following:

A
Hydrometer
B
Lactometer
C
Stalagmometer
D
Thermometer