Question # 1

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.

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Band spectrum

Line spectrum

Continuous spectrum

Absorption spectrum

For non-ohmic devices, the graph between V and I is

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Not a straight line

A straight line

A curve

All of above

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

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Neil Bohr

Einstein

Compton

Rutherford

Eintein's Photoelectric equation is E_k= hf -∅ in this equation E₁, refers to:

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K.E of al the emited electrons

Mean K.E of emited electrons

Maximum K.E of emited electrons

Minimum K.E of emited electrons

The unit of Magnetic flux is called.

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weber

weber/m²

NM^-1A^-1

None of above

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

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Transformer

AC generator

Amplifier

Rectifier

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

The effective way to increase the sensitivity of moving coil galvanometer is.

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Increase the area of coil

Increase the number of turn

Increase the magnetic field

Increase the value of constant C

A Current flowing towards the reader is denoted by.

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Cross

a bracket

A dot

Positive sign

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

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

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80

79

82

83

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

The conductor experience force, placed in magnetic above:

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Move towards weaker part of field

Move towards stronger part of field

Remains at rest

Move upwards in space

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