Question # 1

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

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

The electric field in some region of of space is uniform in magnitude and direction. Which one of the following five statements best desccribes the volume charge density (ρ) , in this region of space?

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ρ = 0

ρ decreases linearly in the direction of the electric field

ρ increases linearly in the direction of the electric field

ρ has a uniform value throughout the region

Induced emf in A.C. generator can be increased by

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Decreasing area of coil

Decreasing magnetic field

Increasing area of coil

Slowing down speed of coil

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

The reactance is the ratio of

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V_rms/I_rms

V_rms x I_rms

I_rms/V_rms

V_max x V_rms

substance which undergo plastic deformation until they break are known as.

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Brittle substances

Ductile substance

Non magnetic substance

Magnetic substance

The net charge on a capacitor magnitude of charge of charge

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Infinity

2 q

Q/2

Zero

In metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

The Balmer series is obtained when all the transition of electrons terminate on

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1^st orbit

2nd orbit

3rd orbit

4th orbit

Electric power:

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Vx1

V²x1

V/1

V/1²

One weber is equal to:

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N.A ²/m

N.m²/A

N.A/m

N.m/A

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

Which series lies in the ultraviolet region.

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Balmer series

Bracket series

Ptund series

Lyman series

A device which converts low voltage or current to high voltage or current is called.

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Transformer

AC generator

Amplifier

Rectifier

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