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

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Question # 1

Selenium is:

Question # 2

Tick the series which lies in the visible region:

Question # 3

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

Question # 4

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

Question # 5

Balmer series was identified in:

Question # 6

The range of wavelengths of colurs in the visible colours is

Question # 7

Lyman series in the spectrum of hydrogen exists in the :

Question # 8

The spectrum emitted from hydrogen filled discharge tube is:

Question # 9

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

Question # 10

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

Question # 11

The electric field lines start from:

Question # 12

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

Question # 13

If the distance between two charges is doubled,the force between them will become:

Question # 14

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

Question # 15

The shell closer to the nucleus 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 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes
3 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
4 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
5 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
6 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
7 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
8 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
9 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
10 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these

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