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

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Question # 1

Selenium is:

Question # 2

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

Question # 3

Tick the series which lies in the visible region:

Question # 4

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

Question # 5

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

Question # 6

The life time of metastable state is equal to

Question # 7

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

Question # 8

The inkjet printer eject a thin stream of:

Question # 9

The value of the metastable state for Neon is

Question # 10

Lyman series in the spectrum of hydrogen exists in the :

Question # 11

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

Question # 12

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

Question # 13

The electric field lines start from:

Question # 14

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

Question # 15

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

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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 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
3 In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
A. Short wavelength
B. Large wavelength
C. Very large wavelenth
D. Low frequency
4 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
5 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
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 He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
8 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
9 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
10 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

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