Question # 1

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

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

For which material medium, force between two charged particles is maximum.

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Ammonia

Germanium

Mica

Teflon

The concept of direction is purely

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Relative

Absolute

Relative to the motion

None of these

Which material should be inserted between the plates of a capacitor in order to increase its capacitance.

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Copper

Mica

Iron

Tin

A transistor has parts:

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2

3

4

5

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

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

The potential difference between the top and bottom of a cloud chamber is of the order of

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290 v

400 v

1 kv

None of above

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

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

Self inductance of a long solenoid is given by

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None of the above

The middle region of electric field is:

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Maximum field spot

Zero field spot

Perpendicular field spot

All of above

Energy stored per uint volume inside a solenoid is called as

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energy density

Electric flux

Work

Volume charge density

Two down and one up quarks make

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Proton

Neutron

~~photon~~

Positron

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

Semiconductor diodes are called:

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Ohmic

non ohmic

Both a & b

none of above

Mutual induction has a practical role in the performance of the.

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Radio choke

Transformers

A.C. Generator

D.C. Generator

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