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

Question # 2

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

Question # 3

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

Question # 4

Braking radiation causes:

Question # 5

Coulomb multiplied by volt by volt gives the unit called:

Question # 6

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

Question # 7

Balmer series was identified in:

Question # 8

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 # 9

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

Question # 10

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

Question # 11

CT scanning is the abbreviated name of

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

The photocopying process is called:

Question # 16

We can excite an atom by

Question # 17

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

Question # 18

The inkjet printer eject a thin stream of:

Question # 19

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

Question # 20

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 # 21

Tick the series which lies in the visible region:

Question # 22

Laser is a beam of:

Question # 23

The value of the metastable state for Neon is

Question # 24

The process of formation of spectrum is called:

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

Selenium is:

Question # 29

Graph of Black body radiation is example of

Question # 30

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
3 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
4 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
5 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
6 In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
A. Helium
B. Neon
C. Both
D. None of these
7 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
8 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
9 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
10 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He

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