Question # 1

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

The electric field created by positive charge is

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Radially inward

Zero

Circular

Radially outward

When platinum wire is heated, it changes to cherry red at temperature.

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500^oC

900^oC

1100^oC

1300^oC

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

Young's modulus for water's is

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Zero

1

2

3

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

The condition of resonance is:

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XL = 1/2 Xc

X_L = X_c

X_c = 4_x2

None of above

A wire uniform cross-section. A length L and resistance R is cut into two equal parts. The resistivity of each part will be:

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Doubled

Halved

Remain the same

One fourth

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

The e/m of a neutron is

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Less than electron

The same as electron

Zero

Greater than election

For ohmic device the graph between V and I is.

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A straight line

Curve

Hyperbola

Parabola

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

The permeability of free space is measured in

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wb A/m

Am/wb

wb/Am

m/wbA

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

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