Question # 1

Radius of first orbit of an atom is r1= 0.053 nm, Radius of second orbit r2 will be.

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0.106 nm

0.212 nm

0.053 nm

0.53 x 10^-10 nm

In photocopier, then drum is coated with layer of.

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Aluminium

Copper

Selenium

silver

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

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

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Motor

Cell

Generator

Thermo couple

Disintegration of photon on striking a nucleus into an electron and positron is known as.

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Annihilation of matter

Compton effect

Pair production

Photo electric effect

Pulsating output of full wave rectifier can be made smooth by using circuit called.

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Filter

Amplifier

Resistor

Transistor

Absorbed Dose 'D' is defined as

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m/E

E/C

C/m

E/m

Albert Einstein got noble prize in:

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1926

1921

1918

1931

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

Rectification is the process of converting.

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D.C. into A.C.

A.C. in to D.C.

Low signal to high

High signal to low

The background radiation to which we are exposed, on the average is.

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1 mSv per year

2 mSv per year

3 mSv per year

4 mSv per year

The mass of beta particle is equal to the mass

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Proton

Neutron

Electron

Photon

An AVO meter can also be called as.

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Digital multimeter

Digital voltmeter

Digital ammeter

Digital ohm meter

For normal use:

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Emitter base function is reversed biased

Collector base junction is reserved biased

Emitter base junction is forward biased

Both c and b

The condition of resonance is:

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XL = 1/2 Xc

X_L = X_c

X_c = 4_x2

None of above

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

Transistors are made from

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Plastics

Metals

Insulator

Doped semi conductors

Iodine -131 is used for the treatment by

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Bones

Eyes

thyroid glands

Lungs

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