Question # 1

We can excite an atom by

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Bombardment of particles

Radiating photons

Providing potential difference

All answer are true

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

Graph of Black body radiation is example of

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Band spectra

Continuo's spectra

Line spectra

All

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

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Double

Half

One third

One fourth

Balmer series was identified in:

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1685

1785

1885

1985

1585

Photons must have energy equal to

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ev

En

hf

None of these

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

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

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1%

20%

30%

50%

70%

Tick the series which lie/s in. the infra-red region.

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Pfund series

Brackett series

Paschen series

All of these

None of these

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

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

The spectrum emitted from hydrogen filled discharge tube is:

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Line spectrum

Discrete spectrum

And spectrum

Absorption spectrum

Both (A) and (B)

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

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 He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

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

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

The results of spectra obtained by Balmer were expressed in 1896 by:

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Bohr

Rydberg

Planck

Rutherford

Coulomb

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

CT scanning is the abbreviated name of

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Computed Technology

Computed Technique

Computed Technology

Computerized Technique

The process of formation of spectrum is called:

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Interference

Spectroscopy

Dispersion

Reflection

Botha (A) and (D)

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

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Less than atmospheric pressure

Much less than atmospheric pressure

Greater than atmospheric pressure

Much greater than atmospheric pressure

Both C and D

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