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

Lyman series in the spectrum of hydrogen exists in the :

Question # 2

The first series which was identified in the spectrum of hydrogen is called:

Question # 3

The process of formation of spectrum is called:

Question # 4

Balmer series was identified in:

Question # 5

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

Question # 6

We can excite an atom by

Question # 7

The photocopying process is called:

Question # 8

Gaussian surface is always:

Question # 9

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 # 10

The first shell near the neucles is

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

The electric field lines start from:

Question # 18

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

Question # 19

CT scanning is the abbreviated name of

Question # 20

A metastable stae:

Question # 21

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

Question # 22

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

Question # 23

Photons must have energy equal to

Question # 24

The value of the metastable state for Neon is

Question # 25

X-ray are also known as

Question # 26

The inkjet printer eject a thin stream of:

Question # 27

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

Question # 28

Laser is a beam of:

Question # 29

Ultraviolet region lies in ______ series

Question # 30

The range of wavelengths of colurs in the visible colours is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
2 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
3 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
4 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
5 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
6 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
7 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
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
8 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
9 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
10 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor

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