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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]

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