ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

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

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

00:00
Question # 1

Ultraviolet region lies in ______ series

Question # 2

Photons must have energy equal to

Question # 3

X-ray are also known as

Question # 4

Balmer series was identified in:

Question # 5

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

Question # 6

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

Question # 7

The first shell near the neucles is

Question # 8

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

Question # 9

Graph of Black body radiation is example of

Question # 10

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

Question # 11

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

Question # 12

A metastable stae:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
2 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
3 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
4 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
5 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
6 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
7 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
8 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
9 In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
A. Helium
B. Neon
C. Both
D. None of these
10 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only

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