Question # 1

In a transistor which one is very thin.

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Collector

Emitter

Base

Depletion region

What do we study by crystallography.

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The analysis of X ray spectra of elements and study of crystal structure.

Visible spectra of sources and crystal study

Ultraviolet spectra of sources and crystal study

Characteristics of X-rays

The most suitable material for moderator in a nuclear reactor is.

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B

Cd

D2O

Uranium

The decay to form other nuclides by emitting particles and electromagnetic radiations by unstable nuclides is called.

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Nuclear stability

Radioactivity

Carbon dating

Spontaneously

An operational amplifier have how many input terminals.

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One

Two

Three

Four

An Alpha particle is the same as

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A helium nucleus

A high speed electron

A hydrogen nucleus

Electromagnetic radiation of short wavelength

Why hydrogen atom does not emit x-rays.

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its size is very small

It contains only single electron

In it energy levels are for apart

In it energy levels are close to each other

Which configuration is used to connect high impedance source to a low impedance lead.

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CE

CB

CC

BE

Which of the following propagates at the same speed as velocity of light.

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Heat waves

Sound waves

Shock waves

Beta particles

Mosley's law establishes the X-rays fluorescence of target element with is.

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Atomic weight

Atomic number

Density

Lattice constant

X-rays are good for imagining

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Tendons

Brain

Bones

Heart

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

The simple form of particle accelerator is.

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Cathode ray tube

Oscillator

_Amplifier

Phase locked loop

A transistor consists of.

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One p-n junction

Two p-n junctions

Three p-n junctions

Four p-n junction

The electrons behave as waves, because they can .

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Produce ions in gases

Diffracted by a crystal

Be deflected by electric fields

Be deflected by magnetic fields

Which one of the following gates in a a universal gate.

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OR

AND

NOT

NAND

The process of energy generation in sun and stars is.

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Fusion of heavy nuclei

fusion of light nuclei

Fission of light nuclei

Solar panels

Which term given below refers to the concept moving clocks run slower than clocks at rest w.r.t an observer.

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Simultaneously

Mass variation

time dilation

Length contraction

In annitilation of matter, positron and electron pair disappears into two

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Alpha particles

Beta particles

Game particles

X-rays

The phenomenon of Compton's effect process that right has

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Wave nature

Particle nature

Dual nature

Corpuscular nature

The most abundant isotope of neon is.

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Neon -20

Neon -21

Neon -22

Both a and c

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