Question # 1

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

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

Braking radiation causes:

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Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

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)

Coulomb multiplied by volt by volt gives the unit called:

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farad

Ohm

Second

joule

Watt

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

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Bohr

Rydberg

Planck

Rutherford

Coulomb

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

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1%

20%

30%

50%

70%

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 first series which was identified in the spectrum of hydrogen is called:

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Lyman series

Balmer series

Paschen series

Brackett series

Pfund series

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any 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

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

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Double

Half

One third

One fourth

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

The life time of metastable state is equal to

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Life time of excited state

Greater than by excited state

Zero

Less than by excited state

The inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

None of these

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

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Short wavelength

Large wavelength

Very large wavelenth

Low frequency

Both (B) and (C)

The first shell near the neucles is

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L-shell

X-shell

N-shell

M-shell

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

The shell closer to the nucleus is called:

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N shell

L shell

K shell

M shell

O shell

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