Question # 1

The unit of strain is:

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Nm

Nm^-2

no unit

Nm²

Which diode works at reverse biasing.

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LED

Photo voltaic cell

Photo diode

Silicon diode

NIBA =

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cθ

θ/c

c²θ

c²/θ

Conversion of A.C into D.C is called:

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Compton effect

Rectification

Amplification

Pair production

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

Iodine -131 is used for the treatment by

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Bones

Eyes

thyroid glands

Lungs

OR gate is represented by:

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X = A+B

X=A.B

X=A+B

X=A.B

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

The Basic circuit element in a D.C. circuits which controls the current and voltage is

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Resistor

Inductor

Capisitor

Transistor

A particles equal or greater in mass than of protons are called.

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Baryons

Leptons

Mesons

Quarks

For an atom of hydrogen atom the radius of the first orbit is given by:

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H/me²

me/4h²

h2/4π² kme²

h² me²

The term invertor is used for.

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NOR gate

XNOR gate

NAND gate

NOT gate

The mass of protons is:

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1.675 x 10^-27 kg

1.693 x 10^-27 kg

1.673 x 10^-31 kg

1.673 x 10^-27 kg

Which is true for both alpha particle and gama rays.

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They cause ionization in air

They can be deflected by electric field

They can be deflected by magnetic field

The y can penetrate a few millimeters of aluminium

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

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50 V

2 V

5 V

15 V

If there is no fourth band, tolerance is shows as

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10%

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

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