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

00:00
Question # 1

The life time of metastable state is equal to

Question # 2

X-ray are also known as

Question # 3

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

Question # 4

The range of wavelengths of colurs in the visible colours is

Question # 5

Coulomb multiplied by volt by volt gives the unit called:

Question # 6

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

Question # 7

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

Question # 8

Static electricity is produced by the transfer of:

Question # 9

Gaussian surface is always:

Question # 10

Laser is a beam of:

Question # 11

Balmer series was identified in:

Question # 12

Photons must have energy equal to

Question # 13

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

Question # 14

The value of the metastable state for Neon is

Question # 15

The first shell near the neucles is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
3 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
4 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
5 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
6 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
7 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
8 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
9 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
10 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above

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  • Salmankhan

    Salmankhan

    01 Feb 2018

    Some mcqs having wrong answers.

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