Question # 1

The AC system is preferred to DC system because:

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AC voltage can be easily changed in magnitude

DC motor angular velocity is affected badly

High voltage AC transmission is less efficient

Domestic appliance require AC voltage for their operation

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

All motions are

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Absolute

Uniform

Relative

Variable

For Paschen series, the value of 'n' starts from

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2

4

6

8

A diode characteristics curve is a plot between

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Current and resistance

Voltage and time

Voltage and current

Current and time

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

The SI Unit of magnetic induction is.

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Weber

Tesla

Gauss

Newton

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

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

In an nihilation emitted photons moves in opposite directions to conserve.

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Mass

Charge

Energy

Momentum

Two resistance of 2 Ohm each are connected in parallel combination equivalent resistance will be.

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4 Ohm

2 Ohm

1 Ohm

8 Ohm

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

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0

π

-π

π/2

106 electrons are moving through a wire per second the current developed is:

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1.6 x 10-19 A

1 A

1.6 x 10-13A

106 A

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

Which of the following is one of the spectral series of atomic hydrogen?

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Brockett series

Balmer series

P fund series

All of above

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

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