Question # 1

The advantage of electron tube over semiconductor is.

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_{its efficiency}

its unlimited type

Its low consumption power

That it takes no warming up time

The critical mass of fissionable uranium -235 can be reduced by

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Adding impurities to it

Heating the material

surrounding it by neutron reflecting material

Surrounding it by neutron absorbing material

In n-p-n transistor the current flows in the direction from

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Emitter to base

emitter to collector

Base to emitter

Base to collector

The phenomenon is which the wavelength of scattered X-rays is larger than the incident X-rays is known as.

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Zeeman's effect

Photoelectric effect

Compton's effect

Annihilation of matter

What is the scale for measurement of Banbridge mass spectrograph.

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Linear

Inverse

Exponential

Logarithmic

In a transistor which one is very thin.

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Collector

Emitter

Base

Depletion region

Radioactive substances do not emit

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Alpha particles

Beta particles

Gama rays

Neutrons

Lissajou's figures are used in a Cathode Ray Oscilloscope while measuring.

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Time period

Frequency

Voltage gain

phase angle

The splitting of atomic energy levels and the associated spectrum lines when the atoms are placed in a magnetic field is called.

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The photoelectric effect

The zeeman effect

The Compton effect

Quantum effect

Which both elements are good for nuclear fission.

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Thorium an uranium

Thorium and radium

Plutonium and uranium

Plutonium and throrium

X-rays are absorbed maximum by

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Paper

Copper

Steel

Lead

Compton scattering experiment seemed to indicate that radiation had

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Wave nature

Particle nature

Wave particle nature

X-rays nature

From which radiation it is most difficult to protect oneslelf.

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Alpha radiation

Beta radiation

Gama radiation

Heat radiation

As oscillator is basically an amplifier with loop gain

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Zero

Infinity

Less than unity

More than unity

The value of principal quantum number for an ionized atom is.

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13.6 eV

27.2 eV

54.4 eV

100 eV

X-rays travel with

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The speed of light

The speed of sound

The speed of 3,000 m s-1

The speed of 3,500 m s-1

The scientific theory concerning the coming into existence of universe.

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Cosmology

Cosmogony

Cosmography

Cosmos

Neither the position nor the momentum of a particle can be predicted with arbitrarily great precision is the statement of.

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Archimede's principle.

Heisenberg uncertainty principle

Mosley's law

Schrodinger's wave equation

What is the overall gain, if three amplifiers each with a gain of 30 are cacaded.

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30

90

270

27,000

Transistor are made from

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Plastics

Metals

Insulators

Doped semiconductors

In CE amplifier phased reversal occurs when the output voltage is taken between

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Base and collector

Base and emitter

Collector and emitter

None of the terminals

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