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General Science multiple choice questions and answers for Staff Selection Commission Exam page contain 5 questions. Each GK mcq has 4 possible answers. Choose your answer and check it with the given correct answer.
(21)
In a filament type light bulb most of electric power consumed appears as :
[A]
LED light
[B]
Infra red rays
[C]
Ultra violet rays
[D]
Fluorescent light
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(22)
The purpose of using Diode is :
[A]
amplification
[B]
purification
[C]
modulation
[D]
demodulation
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(23)
What is the minimum escape velocity of rocket to be launched into space ?
[A]
4KM/Sec
[B]
8KM/Sec
[C]
11KM/Sec
[D]
13KM/Sec
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(24)
Who invented Electron Microscope ?
[A]
Galileo
[B]
Knoll and Ruska
[C]
Robert Koch
[D]
Leeuwenhook
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(25)
What is the wavelength of visible spectrum ?
[A]
1300A0 - 3000A0
[B]
3900A0 - 7600A0
[C]
7800A0 - 8000A0
[D]
8500A0 - 9800A0
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