Question # 1

We can excite an atom by

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Bombardment of particles

Radiating photons

Providing potential difference

All answer are true

The photocopying process is called:

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Geography

Sonography

Xerography

Zerography

None of these

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)

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

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

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

Lyman series in the spectrum of hydrogen exists in the :

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Infra-red region

Visible region

Ultraviolet region

Both(A) and (B)

None of these

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

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

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

The inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

None of these

Graph of Black body radiation is example of

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Band spectra

Continuo's spectra

Line spectra

All

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

The natural arrangement of colours in the spectrum of white light spectrum is

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VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

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

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ECAT Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers

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