Question # 1

A° is the unit of:

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Energy

Length

Nuclear energy

Work

In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp

In Wilson cloud chamber, ß-particles leave

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Thin and continuous tracks

Thick and continuous tracks

No tracks

Thin and discontinuous tracks

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

The charge of an alpha particle is equal to

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-e

+e

-2e

2e

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

Intensity of field inside a hollow charged sphere will be.

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Negative

Unaffected

Zero

Maximum

Colour codes are used to calculate the.

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Nature of resistor

Numerical value of resistance

Potential difference

Current

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

In three phase A.C supply coils are inclined at an angle of.

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0^o

90^o

120^o

80^o

The drift velocity is of order:

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10^-13m/s

10³ m/s

10^-3m/s

10^-4m/s

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

The force on a charge particle moving parallel to magnetic field is:

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Maximum

Minimum

Zero

None of these

The ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

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