Question # 1

When a motor is over loaded then the magnitude of back emf.

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Increases

Decreases

Remain constant

Zero

Binding energy per nucleus for uranium is above:

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6.7 Mev

7.7 Mev

6.9 MeV

7.9 MeV

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

The domain theory of magnet is important to explain the behaviour of

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Diamagnets

Paramagnets

Ferromagnets

All of these

The reverse saturation current in a PN junction diode is only due to:

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Majority carriers

Minoritycarriers

Acceptor ions

Donor ions

If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be

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136.0 volt

3.0 volt

13.6 volt

None of these

The P.D develop in case of germanium is:

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0.3

0.7

0.5

0.9

Number of electros emitted in photo electric effect depend upon.

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Intensity of incident light

Frequency of incident light

Energy of incident light

Wavelength of incident of light

The energy of photon is givne by

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mv2/2

hf

Va e

mac¹

In case of inductor , energy is stored in the

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Electric field

Magnetic field

Potential field

Gravitational field

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

Potentiometer is used to.

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Compare emf of two cells

Detect internal resistance of cell

Measure P.D.

All of these

Sensitivity of a galvanometer can be increased by

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Decreasing the value of torsional couple

Decreasing number of turns

Decreasing area of plane of coil

Decreasing magnetic field

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

At 0 K a piece of silicon is a

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Conductor

Semi-conductor

Insulator

All

The basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

Which one of the following bulbs has the least resistance.

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100 W

200 W

500 W

1000 W

Very weak magnetic field produced by brain can be detected by

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MRI

CAT scans

Squid

CRO

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