Question # 1

X-rays were discovered by

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Curie

Henry Becquerel

Rontgen

None of these

The temperature of core of nuclear reactor is:

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1100°C

1200°C

1300°C

1400°C

The net charge on a capacitor magnitude of charge of charge

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Infinity

2 q

Q/2

Zero

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

Binding energy per nucleus for uranium is above:

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6.7 Mev

7.7 Mev

6.9 MeV

7.9 MeV

The unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above

The motional emf is give by

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qvB

IBL

eBL

vBL

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

The SI unit of magnetic induction Tesla is equal to

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N-1 Am

NA m2

NA-1n2

NA-1m-1

For a current carrying solenoid the term 'n' has unit as.

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No unit

m^-1

m^-2

m-3

The force of Neutron due to field of 10² N/C is.

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1.6 x 10^-17N

1.6 x 10^-19N

Zero

1.6 x 10^-21N

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

The reactance is the ratio of

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V_rms/I_rms

V_rms x I_rms

I_rms/V_rms

V_max x V_rms

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

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