Question # 1

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

When an electron in an atom goes from a lower to higher orbit its:

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K.E increases , P.E decreases

K.E increases , P.E increases

K.E decreases , P.E increases

K.E decreases , P.E decreases

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

The e/m of a neutron is

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Less than electron

The same as electron

Zero

Greater than election

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

Maximum Compton shift is observed at.

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30^oC

90^oC

45^oC

180^oC

Resistance tolerance of silver band is.

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10%

6%

7%

5%

The magnitude of motional emf is given by

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One weber is equal to:

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N.A ²/m

N.m²/A

N.A/m

N.m/A

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

For normal use:

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Emitter base function is reversed biased

Collector base junction is reserved biased

Emitter base junction is forward biased

Both c and b

Drift velocity of electrons is.

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10^-1 m/s

10^-2 m/s

10^-3 m/s

10³ m/s

The brightness of the spot of CRO screen is controlled by.

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Anode

Cathode

Grid

Deflecting plates

The unit of impedance is

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Farad

Henry

Tesla

Ohm

Average value of current and voltage over a complete cycle is.

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Positive

Negative

Zero

Infinite

The output from a full wave rectifier is

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An ac voltage

A dc voltage

Zero

A pulsating unidirectional voltage

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

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