Question # 1

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

If the coil is wound on iron core, the flux through it.

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Decreases

Becomes zero

Increases

Remains constant

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

A diode characteristic curve is a plot between

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Current and time

Voltage and time

Voltage and current

Forward voltage and reverse voltage

Transistor was invented by:

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Bardeen

Micheal faraday

Lenz

Newton

The dimensions of magnetic flux are

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M¹L^-2T¹A¹

MLT^-2A^-1

ML²T²A^-1

ML²T^-2A^-1

In Millikan's oil drop experiment a charged particle of mass 'm' is in equilibrium in an will

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Zero

g/2

g

2g

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

The phase angle of a series RLC circult at resonant frequency is

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1/2

sigma

Zero

sigma /4

In AC system we generate sine wave form because:

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It san be easily draw

It produces least disturbance in electrical circuits

It is nature standard

Other waves cannot be produced easily

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is:

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10.2 eV

0 eV

3.4 eV

6.8 eV

The temperature of core of nuclear reactor is:

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1100°C

1200°C

1300°C

1400°C

Which is true for both alpha particle and gama rays.

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They cause ionization in air

They can be deflected by electric field

They can be deflected by magnetic field

The y can penetrate a few millimeters of aluminium

Seven resistances are connected as shown in the figures . THe equivalent resistance between A and B is:

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3Ω

4Ω

4.5Ω

5Ω

The SI unit of magnetic permeability is.

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WbA-1m-1

Wbm-2

WbmA-1

WbAm-1

In gas the charge carriers are:

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Electrons

Ions

Both a & b

None of above

The fact that electric field exist in space around an electrical charge is

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Electrical property

Gravitational property

Intrinsic property of nature

Extrinsic property of nature

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