Question # 1

The continuous x rays spectrum is obtained due to

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Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

The process by which nuclei emit a ,b and gama rays in order to attain stability is called.

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Radioactive disintegration

Radio activity

B decay

Radioactive transmulation

The absorption of X-rays in a given material follows.

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A parabola path

Is straight line

An exponential curve

A circle

Lines of Balmer series are emitted by hydrogen atom when the electron jumps from

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The first orbit to any other orbit

Higher orbits to second orbit

Higher orbits to first orbit

The third orbit to higher orbit

If we use two diodes and a centre tapped transformer we eill get

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Transistor

Amplifier

Half wave rectifier

Full wave rectifier

When of the following radiations are not emitted by electron transitions in atoms.

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Visible rays

Ultraviolet rays

Infrared radiations

Alpha particles

The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is.

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Directly proportional to n

Directly proportional to n2

Inversely proportional to n

Inversely proportional to n2

In electromagnetic spectrum X-rays are next to.

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Water waves

Radio waves

ultraviolet waves

Infrared waves

The best shield against Gama rays would be of

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Heavy water

Aluminium

Iron

Lead

Which of the following is not a mode of radioactive decay

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Nuclear fusion

Alpha decay

Electron capture

Positron emission

The converse of pair production is

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Annihilation of matter

Materialization

Compton effect

Photo electric effect

The division and germier experiment relates to

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Diffusion

interference

Polarization

Electron diffraction

Which of the following is deflected by an electric field.

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Alpha particles

X rays

Gama rays

Neutrons

LED is a p-n junction that emits

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Visible light

X- rays

Ultraviolet light

electromagnetic waves

The maximum K.E of photo electrons depends upon

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Energy of incident radation

Frequency of incident radiation

Wavelength of incident radiation

Mass of incident radiation

Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits

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Radiowaves

Alpha particles

Beta particles

gama particles

The particles equal in mass or greater than protons are called.

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Mesons

Bosons

Baryons

Nucleons

In CC configuration voltage gain is.

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Less than one

More than one

One

Zero

An example of continuous spectrum is.

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Black body radiation spectrum

Molecular spectra

Atomic spectra

All of the above

Which one of the following has maximum frequency.

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Visible light

Gama rays

Ultraviolet rays

Infrared rays

In which reaction two or more small light nuclei nuclei come together or fuse to form a large nucleus.

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Radioactivity

Radioactivity dating

Nuclear fusion

Nuclear fission

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