Question # 1

For an atom of hydrogen atom the radius of the first orbit is given by:

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H/me²

me/4h²

h2/4π² kme²

h² me²

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

Which of the following are not hadrons.

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Muons

Mesons

Positrons

Neutrons

The effective value of any sinusoidal alternating current or voltage is

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None of the above

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The process of copying is:

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Axillugraphy

Chromatography

Xerography

Spectrography

A charged conductor has charge on its.

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Inner surface

Outer surface

Middle surface

Surrounding space

The charge on Beta particle is

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+e

-e

-2e

None of these

Albert Einstein got noble prize for service in:

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Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

Which material should be inserted between the plates of a capacitor in order to increase its capacitance.

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Copper

Mica

Iron

Tin

An AVO meter can also be called as.

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Digital multimeter

Digital voltmeter

Digital ammeter

Digital ohm meter

A soft iron cylinder is placed inside coil galvanometer to:

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Make field circular and strong

Make field radial and weak

Make field radial and strong

All of above

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

Minority carriers in P-Types , substances are.

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Electrons

Protons

Holes

Neutrons

Which factor does not affect the conductivity of PN-Junction diode.

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Doping

Temperature

Voltage

Pressure

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

Glass and high steel carbon are example of.

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Ductile substances

Brittle substances

Soft substances

Hard substances

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