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

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

Question # 2

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

Question # 3

Selenium is:

Question # 4

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 # 5

The value of the metastable state for Neon is

Question # 6

The shell closer to the nucleus is called:

Question # 7

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

Question # 8

Photons must have energy equal to

Question # 9

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

Question # 10

Static electricity is produced by the transfer of:

Question # 11

X-ray are also known as

Question # 12

The results of spectra obtained by Balmer were expressed in 1896 by:

Question # 13

The spectrum emitted from hydrogen filled discharge tube is:

Question # 14

By CAT scans, we can detect the density difference of the order of:

Question # 15

The inkjet printer eject a thin stream of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
2 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
3 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
4 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
5 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
6 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
7 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
8 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
9 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
10 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays

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