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 inkjet printer eject a thin stream of:

Question # 2

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

Question # 3

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

Question # 4

Coulomb multiplied by volt by volt gives the unit called:

Question # 5

Graph of Black body radiation is example of

Question # 6

The life time of metastable state is equal to

Question # 7

The He-Ne laser discharge tube is filled with:

Question # 8

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

Question # 9

The range of wavelengths of colurs in the visible colours is

Question # 10

Selenium is:

Question # 11

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

Question # 12

The first shell near the neucles is

Question # 13

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 # 14

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

Question # 15

Tick the series which lies in the visible region:

Question # 16

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

Question # 17

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

Question # 18

We can excite an atom by

Question # 19

A metastable stae:

Question # 20

Gaussian surface is always:

Question # 21

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

Question # 22

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

Question # 23

The spectrum emitted from hydrogen filled discharge tube is:

Question # 24

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

Question # 25

The shell closer to the nucleus is called:

Question # 26

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

Question # 27

The electric field lines start from:

Question # 28

CT scanning is the abbreviated name of

Question # 29

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

Question # 30

The photocopying process is called:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
2 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region
3 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
4 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
5 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
6 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
7 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
8 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
9 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
10 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%

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