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

A metastable stae:

Question # 2

The first shell near the neucles is

Question # 3

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

Question # 4

Graph of Black body radiation is example of

Question # 5

Selenium is:

Question # 6

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

Question # 7

The process of formation of spectrum is called:

Question # 8

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

Question # 9

Photons must have energy equal to

Question # 10

Laser is a beam of:

Question # 11

The value of the metastable state for Neon is

Question # 12

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

Question # 13

The inkjet printer eject a thin stream of:

Question # 14

The electric field lines start from:

Question # 15

Static electricity is produced by the transfer of:

Question # 16

Lyman series in the spectrum of hydrogen exists in the :

Question # 17

The photocopying process is called:

Question # 18

X-ray are also known as

Question # 19

Tick the series which lies in the visible region:

Question # 20

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

Question # 21

We can excite an atom by

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

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 # 27

The He-Ne laser discharge tube is filled with:

Question # 28

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

Question # 29

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

Question # 30

The life time of metastable state is equal to

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
2 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
3 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
4 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
5 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
6 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
7 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
8 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second
9 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
10 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford

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