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

A metastable stae:

Question # 2

Photons must have energy equal to

Question # 3

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

Question # 4

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

Question # 5

Laser is a beam of:

Question # 6

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

Question # 7

The process of formation of spectrum is called:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Balmer series was identified in:

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

Question # 16

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

Question # 17

Lyman series in the spectrum of hydrogen exists in the :

Question # 18

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

Question # 19

The life time of metastable state is equal to

Question # 20

Selenium is:

Question # 21

Ultraviolet region lies in ______ series

Question # 22

The spectrum emitted from hydrogen filled discharge tube is:

Question # 23

The first shell near the neucles is

Question # 24

Braking radiation causes:

Question # 25

The value of the metastable state for Neon is

Question # 26

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

Question # 27

The photocopying process is called:

Question # 28

Tick the series which lies in the visible region:

Question # 29

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

Question # 30

We can excite an atom by

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 An compared to solid matter, a crack or an air bubble allows:
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these
3 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
4 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
5 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
6 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
7 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
8 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
9 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
10 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth

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