Physics - General Knowledge Questions and Answers

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Super conductors are substances that

Offer minimum resistance to flow of electric current

Conduct electricity at low temperature

Conduct electricity at high temperature

Offer high resistance to the flow of electric current

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A galvanometer can be converted to a voltmeter by connecting

A high resistance in parallel

A high resistance in series

A low resistance in series

A low resistance in parallel

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Certain substances loose their electrical resistance completely at super low temperature. Such substances are called.

Superconductors

Semi conductors

Dielectrics

Perfect conductors

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The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?

8.5 A

24 A

10 A

12 A

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Which of the following experiments analyzed the Fraunhofer lines of the solar spectrum?

Barkla's experiment on scattering of X-rays

Lamb-Rutherford experiment

Geiger and Marsdens experiment on scattering of alpha particles

Bunsen and Kirchhoff's experiment

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Erg cross Sec is the unit of

Angular momentum

Linear Momentum

Planck's constant

Energy

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A dynamometer wattmeter can be used for

Only Direct Current

Only Active Current

Both A & B

None of the above

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Kirchhoff's laws are applicable to

D.C. circuits only

A.C. circuits only

D.C. and A.C. circuits both

None of the above

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The device which converts AC to DC is

Oscillator

Amplifier

Rectifier

None of these