Question # 1

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

The work done is bringing a unit positive charge from infinity to that point in an electric field is called.

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Potential

Potential difference

Absolute potential

All of these

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

When platinum wire is heated, it changes to cherry red at temperature.

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500^oC

900^oC

1100^oC

1300^oC

In a pure inductive A.C. circuit the current.

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Lags behind voltage by 90 ^o

Leads the voltage by 90 ^o

In phase with voltage

Leads the voltage by 270 ^o

Antiparticle of electron is.

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proton

Photon

Positron

Neutron

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

I amu =

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9.31 MeV

931 MeV

9.031 MeV

None of above

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

Nuclear fission was discovered by:

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Otto Hahn

Friz strassmann

Both a and b

Michaelson

The first theory about the structure of an atom was introduced by

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Neil Bohr

Einstein

Compton

Rutherford

NC-1 is the SI unit is

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Force

Charge

Current

Electric intensity

The first atomic reactor was introduced by

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Currie

Enrico Fermi

Newton

Bohr

An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:

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50 Hz

25Hz

100 Hz

75 Hz

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

Gauss's law can only be applied to.

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A curved surface

A flat surface

A closed surface

A surface of any shape

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