Question # 1

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

When gama rays are emitted, the nuclear mass.

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Decreases by 4 units

Does not change

Increases by 2 units

Increase by 1 unit

Automatic function of street light can be done by the use of.

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Inductor

Rectifier

Comparator

emf

A battery move a charge of 40 C around a circuit at constant rate in 20 Sec. The current will be.

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2 A

0.5 A

80 A

800 A

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

Coulomb /volt is called.

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Farad

Ampere

Joule

Henry

The color code of "Green"

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8

3

5

7

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

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Two times

Eight times

Four times

Remain same

The electric flux through closed surface depends upon

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Charge

Medium

Geometry

Charge and Medium

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

The natural frequency of L.C circuit is equal to

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The gain of transistor amplifier depends upon

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Resistance connected with collector

Resistance connected with base voltage

Input voltage

Output voltage

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

Logic gate can control some physical parameters like.

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Temperature, Pressure

Resistance, Inductance

Capacitance, Impedance

Current, voltage

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

Wave nature of particle was given by:

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Clemensen

Louis de Broglie

Laster H. Germer

Clinton S. Davisson

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