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

Questions

41 Which device is used to convert sound energy into electrical energy ?

A Solar cell

B Gramophone

C Microphone

D Loudspeaker

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

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

Answer: Option [B]

44 Because of _______ red light is used for signals ?

A High frequency

B High intensity

C Long wavelength

D High refraction

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

Answer: Option [C]