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

00:00
Question # 1

Lyman series in the spectrum of hydrogen exists in the :

Question # 2

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

Question # 3

Braking radiation causes:

Question # 4

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

Question # 5

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

Question # 6

The value of the metastable state for Neon is

Question # 7

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

Question # 8

The life time of metastable state is equal to

Question # 9

The electric field lines start from:

Question # 10

The results of spectra obtained by Balmer were expressed in 1896 by:

Question # 11

Balmer series was identified in:

Question # 12

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Question # 13

Tick the series which lies in the visible region:

Question # 14

Selenium is:

Question # 15

The photocopying process is called:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
2 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
3 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
4 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
5 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
6 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
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
7 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
8 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
9 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
10 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985

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