Question # 1

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

The existence of positron was discovered in:

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1929

1928

1931

1933

Alpha particle carries a charge.

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-e

+2e

-2e

No charge

The first orbit in the hydrogen atom has a radius.

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0.53 nm

0.053 nm

0.0053 nm

0.00053 nm

_______ is the building block of every electronic circuit.

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Semi conductor diode

Resistor

Capacitor

Amplifier

Electric flux is a

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Vector quantity

Scalar quantity

Both (a) and (b)

None of above

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

A sensitive galvanometer is

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Unstable

Stable

Moderate

Both B and C

Useful device to measure resistance, current and voltage is an electronic instrument called.

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Volt meter

Ammeter

Ohmmeter

Digital Multimeter

Which one has the least resistance.

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Galvanometer

Ammeter

Ohm meter

Volta meter

The binding energy for_________ is maximum.

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Copper

Glass

Iron

Aluminum

An electron miroscope emplys which to one of the following particles?

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Electron ahve a wave nature

Electrons can be focused by an electric field

Electrons can be focused by a magnetic field

All of the above

Electron volt is unit of:

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Chemical energy

Potential energy

Nuclear energy

heat energy

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

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