Question # 1

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

The colour of light emitted by a LED depends on.

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It forward biased

Its reverse biased

Unbiased

None of these

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

The unit of magnetic induction is:

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Tesla

Weber

Weber metre

NAm^-1

A pair of quark and anti quark makes a.

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Meason

harden

Lapton

Baryon

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

The substance which atom cooperates with each other in such a way so as to exhibit a strong magnetic field is called.

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Ferromagnetic

Paramagnetic

Diamagnetic

Non magnetic

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

DC generator by william Sturgeon in:

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1894

1961

1834

1961

The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

The condition of resonance is:

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XL = 1/2 Xc

X_L = X_c

X_c = 4_x2

None of above

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