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

Laser is a beam of:

Question # 2

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

Question # 3

Static electricity is produced by the transfer of:

Question # 4

Gaussian surface is always:

Question # 5

Balmer series was identified in:

Question # 6

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 # 7

The life time of metastable state is equal to

Question # 8

Tick the series which lies in the visible region:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

The photocopying process is called:

Question # 13

X-rays produced in a tube operating at 105V. The speed of X-rays produced is

Question # 14

The range of wavelengths of colurs in the visible colours is

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
3 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
4 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
5 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
6 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
7 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
8 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
9 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
10 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes

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