Question # 1

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

The moderator used in a nuclear reactor

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Sodium

Uranium

Graphite

Cadmium

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

The galvanometer can be made sensitive by making the factor BAN/C

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Large

Small

Constant

Zero

Recentaly a complex crystalline structure known as yttrium barium copper oxide (Yba₂Cu₃O₃) have reported to become super conductor at

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163 K

169 K

200 K

100 K

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The current through a resistance of 100 Ohm when connecting across a source of 220 V is.

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22000 A

22 A

2.2 A

0.45 A

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

The value of Rydberg constant is

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1.0974 x 10⁷ m^-1

1.0974 x 10^-7 m^-1

1.0974 x 10⁶ m^-1

1.0974 x 10^-6 m^-1

Which component of the transistor has greater contrition of impurity.

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Base

Emitter

Collector

Emitter and collector

The output voltage of a rectifier is.

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Smooth

Pulsating

Alternating

Per featly direct

The output of two input is zero only when its.

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Both inputs are zero

Either input is zero

Both inputs are one

Either input is one

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

What is difference is isotopes

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Number of protons

Number of neutrons

Number of electrons

Charge number

The relative permitivity of air is

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79.5

1.006

1.06

1.0006

Various types of cancer are treated by

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Carbon -14

Nickel -63

Cobalt -60

Strontium -90

An alternating quantity (voltage or current) is completely known if we know its:

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Maximum

Frequency and phase

Effective value

Both (a) & (b)

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