Question # 1

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

Black Body radiation spectrum is an example of:

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Atomic spectra

Line spectra

Continuous spectra

None of above

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

Charge on an atom is:

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Positive

Negative

Neutral

None of these

Resistivity at a given temperature depends upon.

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Area of cross section

Length

Nature of material of conductor

Both length and area

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 minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

Einstein was awarded Nobel prize in physics in

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1905

1911

1918

1921

If a charge Q flows through any cross section of the conductor in time t, the current I is

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I=Qt

The electric flux through closed surface depends upon

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Charge

Medium

Geometry

Charge and Medium

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

If the resistance of 500 Ohm have fourth band of silver colour then its upper maximum resistance will be.

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600 Ohm

550 Ohm

450 Ohm

400 Ohm

Greater concentration of impurity is added in.

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Base

Emitter

Collector

LED

substance which undergo plastic deformation until they break are known as.

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Brittle substances

Ductile substance

Non magnetic substance

Magnetic substance

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

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