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Physics

Physics
Electrical Energy is the energy of

Protons
All listed here
Electrons
Neutrons

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Physics
A television channel is characterised by

Physical dimension of television screen
Frequency of transmitted signal
Velocity of transmitted signal
Size of picture tube

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Physics
A good conductor while carrying current is

Positively charged
Alternately charged positive and negative
Negatively charged
Electrically neutral

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Physics
A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is :

0.21111111111111
0.12777777777778
0.20902777777778
0.12638888888889

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Physics
The GPS device in an automobile uses which communication channel?

Radio frequency
Satellite
Microwave
Infrared

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Physics
Which of the following is the unit of perceived loudness of sound ?

Sone
Hertz
Decibel
Phon

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