ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

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

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

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Question # 1

We can excite an atom by

Question # 2

The spectrum emitted from hydrogen filled discharge tube is:

Question # 3

Tick the series which lies in the visible region:

Question # 4

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

Question # 5

Photons must have energy equal to

Question # 6

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

Question # 7

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

Question # 8

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 # 9

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Question # 10

CT scanning is the abbreviated name of

Question # 11

Braking radiation causes:

Question # 12

X-ray are also known as

Question # 13

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

Question # 14

The process of formation of spectrum is called:

Question # 15

Selenium is:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
2 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
3 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
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 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
6 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
7 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
8 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
9 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
10 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All

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