Question # 1

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

An electromagnetic wave goes from air to glass which of the following does not change?

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Radio waves

X-rays

Ultra violet radiation

Ultra sond waves

The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220 V. The ratio of resistance of their filament will be:

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1:2

2:1

1:3

4:3

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

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

If force in the direction of velocity of conductor, then induced current is directed,

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Anti clockwise

Clock wise

At equilibrium

None of above

The energy of photon is givne by

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mv2/2

hf

Va e

mac¹

Balmer series lies in

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Visible region

Invisible region

Ultraviolet region

Infrared region

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

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

Intensity of field inside a hollow charged sphere will be.

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Negative

Unaffected

Zero

Maximum

The semi conductor diode has the property of

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Two way conduction

Zero conduction

One way conduction

Amplification

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

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

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

Kx -Xrays are produced due to transition of electron from.

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K to L shell

L to K shell

M to K shell

M to L shell

If a charged body is moved against the electric field it will gain.

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P.E.

K.E.

Mechanical energy

Electrical potential energy

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