Question # 1

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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Small

Greater

Equal

Sometimes

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

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Frequency

Penetrating power

Energy

Method of creation

A metastable stae:

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Is an excited state

Is that in which excited electron is stable

Is that in which excited electron is usually unstable

Means a time interval of 10^-8second

Both (A) and (C)

Photons must have energy equal to

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ev

En

hf

None of these

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

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one

two

three

four

five

Graph of Black body radiation is example of

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Band spectra

Continuo's spectra

Line spectra

All

An compared to solid matter, a crack or an air bubble allows:

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Great amount of X-rays to pass

Smallast amount of X-rays to pass

Very samall amount of X-rays to pass

Any of these

None of these

The photocopying process is called:

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Geography

Sonography

Xerography

Zerography

None of these

An electron of the hydrogen atom in the second orbit is called its:

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Ground state

Excited state

Ionized state

Any of these

None of these

We can excite an atom by

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Bombardment of particles

Radiating photons

Providing potential difference

All answer are true

The inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

None of these

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All of these

The results of spectra obtained by Blamer were expressed in 1896 by

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Bohr

Rydberg

Planck

Rutherford

Coulomb

The first shell near the neucles is

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L-shell

X-shell

N-shell

M-shell

The process of formation of spectrum is called:

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Interference

Spectroscopy

Dispersion

Reflection

Botha (A) and (D)

Balmer series lies in that region of electromagnetic wave spectrum which is called:

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Visible region

Invisible region

Infra-red region

ultraviolet region

None of these

Braking radiation causes:

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Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

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1.24 x 10^-10m

7.92 x 10^-20m

2.78 x 10^-14m

3.88 x 10^-11m

If the distance between two charges is doubled,the force between them will become:

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Double

Half

One third

One fourth

X-rays can penetrate in a solid matte through a distance of several:

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Kilo metres

Metres

Centimeters

A few angstroms

One micrometer

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

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Ultra red region

Visible region

Ultraviolet region

Any of these

None of these

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

The range of wavelengths of colurs in the visible colours is

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140 nm to 456 nm

10 nm to 56 nm

410 nm to 656 nm

910 nm to 956 nm

None of these

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

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Ionization energy

Ionization potential

Excitation energy

Excitation potential

None of these

By CAT scans, we can detect the density difference of the order of:

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1%

20%

30%

50%

70%

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

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