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General Science Questions and Answers | General Awareness for SSC UPSC NDA CDS Railways PSC Exams

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General Science multiple choice questions and answers for various exams like ssc, upsc, nda, cds, rrb, psc page contain 5 questions. Each General Awareness mcq has 4 possible answers. Choose your answer and check it with the given correct answer.
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(41) Which device is used to convert sound energy into electrical energy ?
[A] Solar cell
[B] Gramophone
[C] Microphone
[D] Loudspeaker

Comment

Answer: Option [C]
(42) The device dynamo is used to convert :
[A] Electrical energy into mechanical energy
[B] Electrical energy into heat energy
[C] Mechanical energy into electrical energy
[D] None of these

Comment

Answer: Option [C]

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(43) Ball pen functions on the principle of :
[A] Lenz's law
[B] Surface tension
[C] Doppler effect
[D] Gravitional force

Comment

Answer: Option [B]
(44) Because of _______ red light is used for signals ?
[A] High frequency
[B] High intensity
[C] Long wavelength
[D] High refraction

Comment

Answer: Option [C]
(45) Which of the following light rays is used for eliminating bacteria ?
[A] Alpha rays
[B] Infrared rays
[C] Ultra-violet radiation
[D] Microwave radiation

Comment

Answer: Option [C]

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