Question # 1

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

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Current

Power

Voltage

Direction of winding

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

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2

The symbol of p-n-p transistor is

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The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

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

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Threshold energy

Threshold frequency

Work function

Work ability

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

The number of electrons emitted depends upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

Which pair belongs to hadrons.

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Protons and Neutrons

Neutrons and electrons

Photons and electrons

positrons and electrons

Three resistors of resistance R each are combined in various ways, Which of the following cannot be obtained?

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3 RΩ

2R /4Ω

R/3Ω

2R /3Ω

Which of the following has bulk modulus?

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Water

Gas

Honey

All

For an atom of hydrogen atom the radius of the first orbit is given by:

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H/me²

me/4h²

h2/4π² kme²

h² me²

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

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