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

00:00
Question # 1

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 2

Lyman series in the spectrum of hydrogen exists in the :

Question # 3

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

Question # 4

A metastable stae:

Question # 5

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

Question # 6

The spectrum emitted from hydrogen filled discharge tube is:

Question # 7

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

Question # 8

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 # 9

Selenium is:

Question # 10

X-ray are also known as

Question # 11

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

Question # 12

Coulomb multiplied by volt by volt gives the unit called:

Question # 13

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

Question # 14

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

Question # 15

Graph of Black body radiation is example of

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four
2 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)
3 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
4 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
5 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
6 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
7 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
8 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
9 Energy required by an electron revolving in certain orbit to jump to an excited state is called:
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential
10 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV

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