ECAT Pre General Science Physics Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 20 Atomic Spectra

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 20 Atomic Spectra

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ECAT Pre General Science Physics Chapter 20 Atomic Spectra

00:00
Question # 1

X-ray are also known as

Question # 2

The electric field lines start from:

Question # 3

We can excite an atom by

Question # 4

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

Question # 5

The first shell near the neucles is

Question # 6

Tick the series which lie/s in. the infra-red region.

Question # 7

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

Question # 8

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 # 9

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

Question # 10

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Question # 11

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

Question # 12

X-rays can penetrate in a solid matte through a distance of several:

Question # 13

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

Question # 14

Static electricity is produced by the transfer of:

Question # 15

Gaussian surface is always:

Question # 16

Selenium is:

Question # 17

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

Question # 18

Tick the series which lies in the visible region:

Question # 19

The range of wavelengths of colurs in the visible colours is

Question # 20

The He-Ne laser discharge tube is filled with:

Question # 21

Braking radiation causes:

Question # 22

Laser is a beam of:

Question # 23

Spectrum represents the number of component colours present in certain light in terms of:

Question # 24

A metastable stae:

Question # 25

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

Question # 26

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

Question # 27

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 # 28

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

Question # 29

Photons must have energy equal to

Question # 30

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
3 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
4 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
5 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
6 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
7 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
8 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
9 The first series which was identified in the spectrum of hydrogen is called:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
10 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these

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