Question # 1

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

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

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

The P.D develop in case of silicon is:

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0.7V

0.3V

0.5V

0.9V

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

Power dissipation in A.C circuit is expressed as:

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P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

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

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Threshold energy

Threshold frequency

Work function

Work ability

When charge particle enter perpendicular to magnetic field, the path followed by it is:

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A helix

A circle

Straight line

Ellipes

If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

The brightness of the spot of CRO screen is controlled by.

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Anode

Cathode

Grid

Deflecting plates

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

In metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

The Weber is unit of measure of:

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Conductance

Electric current

Magnitic flux

Electric flux

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

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