ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

Try The MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

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ECAT Physics Chapter 20 Atomic Spectra

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Question # 1

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

Question # 2

Static electricity is produced by the transfer of:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The electric field lines start from:

Question # 7

The life time of metastable state is equal to

Question # 8

The value of the metastable state for Neon is

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

A metastable stae:

Question # 15

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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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)
2 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
3 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
4 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
5 Energy required by an electron revolving in certain orbit to jump to an excited state is called:
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential
6 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
7 The range of wavelengths of colurs in the visible colours is
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
8 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
9 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
10 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state

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