ECAT Pre General Science Physics Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 20 Atomic Spectra

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ECAT Pre General Science Physics Chapter 20 Atomic Spectra

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Question # 1

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

Question # 2

Graph of Black body radiation is example of

Question # 3

Gaussian surface is always:

Question # 4

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

Question # 5

Lyman series in the spectrum of hydrogen exists in the :

Question # 6

The process of formation of spectrum is called:

Question # 7

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

Question # 8

The life time of metastable state is equal to

Question # 9

The first shell near the neucles is

Question # 10

Photons must have energy equal to

Question # 11

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

Question # 12

Spectrum represents the number of component colours present in certain light in terms of:

Question # 13

Selenium is:

Question # 14

The electric field lines start from:

Question # 15

The inkjet printer eject a thin stream of:

Question # 16

Balmer series lies in that region of electromagnetic wave spectrum which is called:

Question # 17

CT scanning is the abbreviated name of

Question # 18

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

Question # 19

The spectrum emitted from hydrogen filled discharge tube is:

Question # 20

Balmer series was identified in:

Question # 21

The range of wavelengths of colurs in the visible colours is

Question # 22

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

Question # 23

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

Question # 24

The He-Ne laser discharge tube is filled with:

Question # 25

X-rays produced in a tube operating at 105V. The speed of X-rays produced is

Question # 26

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

Question # 27

An electron of the hydrogen atom in the second orbit is called its:

Question # 28

Coulomb multiplied by volt by volt gives the unit called:

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
2 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
3 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
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure
4 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
5 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
6 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
7 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four
8 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
9 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second
10 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape

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