Question # 1

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

Concept of the electric field lines is introduced by

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Coulomb

Faraday

Einstein

Joseph henry

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

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Ammonia

Germanium

Mica

Teflon

Unit (S.I) of temperature coefficient of resistivity of a material is

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K

K^-1

^oC

K^-2

A radio active substance has a half life of four months. 3 -fourth of the substance will decay in:

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6 months

8 months

12 months

16 months

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

The velocity of electron moving is 1st orbit of hydrogen atom is:

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2.09 x 10⁶ ms^-1

2.18 x10⁶ ms^-1

2.19 x 10⁶ ms^-1

3.18 x10⁶ ms^-1

An A.C. voltmeter reads 220 V, its peak value will be

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225 V

240 V

311.12 V

300 V

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

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

By modern system of NAVSTAR, the speed any where on the earth can be determined to accuracy about.

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20 ms-1

10 ms-1

2 cms-1

2 ms-1

Main reason for world wide use of A.C. is

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It is cheaper

Transmitted

Botha a and b

Reaches in short time

OR gate is represented by:

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X = A+B

X=A.B

X=A+B

X=A.B

The induction can be increased by winding the wire around a core made of.

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Copper

Silicon

Iron

Aluminum

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

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