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

An electron of the hydrogen atom in the second orbit is called its:

Question # 2

Coulomb multiplied by volt by volt gives the unit called:

Question # 3

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

Question # 4

The inkjet printer eject a thin stream of:

Question # 5

Selenium is:

Question # 6

X-ray are also known as

Question # 7

We can excite an atom by

Question # 8

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

Question # 9

Balmer series was identified in:

Question # 10

Static electricity is produced by the transfer of:

Question # 11

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

Question # 12

The natural arrangement of colours in the spectrum of white light spectrum is

Question # 13

Ultraviolet region lies in ______ series

Question # 14

Photons must have energy equal to

Question # 15

Tick the series which lies in the visible region:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
2 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
3 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
4 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
5 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
6 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
7 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)
8 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
9 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
10 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region

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