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

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

Question # 2

The He-Ne laser discharge tube is filled with:

Question # 3

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

Question # 4

Lyman series in the spectrum of hydrogen exists in the :

Question # 5

The electric field lines start from:

Question # 6

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

Question # 7

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

Question # 8

Coulomb multiplied by volt by volt gives the unit called:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Tick the series which lies in the visible region:

Question # 15

Photons must have energy equal to

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
2 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
3 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
4 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
5 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
6 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
7 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
8 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
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 The first series which was identified in the spectrum of hydrogen is called:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series

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