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

X-ray are also known as

Question # 2

Photons must have energy equal to

Question # 3

Coulomb multiplied by volt by volt gives the unit called:

Question # 4

Selenium is:

Question # 5

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

Question # 6

The life time of metastable state is equal to

Question # 7

Gaussian surface is always:

Question # 8

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

Question # 9

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

Question # 10

Tick the series which lies in the visible region:

Question # 11

The first shell near the neucles is

Question # 12

The electric field lines start from:

Question # 13

Ultraviolet region lies in ______ series

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
2 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
3 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
4 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
5 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
6 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
7 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
8 Spectrum represents the number of component colours present in certain light in terms of:
A. Wavelength
B. Frequency
C. Energy
D. Both (A) and (B)
9 The range of wavelengths of colurs in the visible colours is
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
10 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

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