ECAT Pre General Science Physics Chapter 20 MCQ Test With Answer

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

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Question # 1

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

Question # 2

Photons must have energy equal to

Question # 3

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

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

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

Question # 6

Lyman series in the spectrum of hydrogen exists in the :

Question # 7

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

Question # 8

The photocopying process is called:

Question # 9

Laser is a beam of:

Question # 10

The first shell near the neucles is

Question # 11

Gaussian surface is always:

Question # 12

The range of wavelengths of colurs in the visible colours is

Question # 13

Graph of Black body radiation is example of

Question # 14

The spectrum emitted from hydrogen filled discharge tube is:

Question # 15

Coulomb multiplied by volt by volt gives the unit called:

Question # 16

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

Question # 17

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

Question # 18

Braking radiation causes:

Question # 19

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

Question # 20

Selenium is:

Question # 21

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

Question # 22

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

Question # 23

Static electricity is produced by the transfer of:

Question # 24

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

Question # 25

The electric field lines start from:

Question # 26

The life time of metastable state is equal to

Question # 27

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

Question # 28

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

Question # 29

Tick the series which lies in the visible region:

Question # 30

Balmer series was identified in:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
3 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
4 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)
5 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
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 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
8 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
9 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
10 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography

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