Question # 1

The holes created in the L and M shells are occupied by transitions of:

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Electrons from lower states

Electrons from higher state

Positrons from higher states

Electrons from K shell

Both (A) and (B)

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

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1%

20%

30%

50%

70%

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

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Bohr

Rydberg

Planck

Rutherford

Coulomb

The photocopying process is called:

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Geography

Sonography

Xerography

Zerography

None of these

The inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

None of these

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

CT scanning is the abbreviated name of

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Computed Technology

Computed Technique

Computed Technology

Computerized Technique

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

The first shell near the neucles is

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L-shell

X-shell

N-shell

M-shell

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

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VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

None of these

The lasing or active medium in He-Ne laser discharge tube is:

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Nitrogen

Helium

Hydrogen

Neon

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

Coulomb multiplied by volt by volt gives the unit called:

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farad

Ohm

Second

joule

Watt

The shell closer to the nucleus is called:

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N shell

L shell

K shell

M shell

O shell

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

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

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

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

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

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

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

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

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

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

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ECAT Pre General Science Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers

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