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

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

Question # 2

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

Question # 3

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

Question # 4

The life time of metastable state is equal to

Question # 5

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

Question # 6

Static electricity is produced by the transfer of:

Question # 7

X-ray are also known as

Question # 8

Balmer series was identified in:

Question # 9

Tick the series which lies in the visible region:

Question # 10

The range of wavelengths of colurs in the visible colours is

Question # 11

The spectrum emitted from hydrogen filled discharge tube is:

Question # 12

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

Question # 13

Braking radiation causes:

Question # 14

The first shell near the neucles is

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
2 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
3 An compared to solid matter, a crack or an air bubble allows:
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these
4 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
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 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
7 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
8 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
9 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
10 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%

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