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

Photons must have energy equal to

Question # 2

The photocopying process is called:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Tick the series which lies in the visible region:

Question # 7

Balmer series was identified in:

Question # 8

The shell closer to the nucleus is called:

Question # 9

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

Question # 10

Gaussian surface is always:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

CT scanning is the abbreviated name of

Question # 15

Graph of Black body radiation is example of

Question # 16

The value of the metastable state for Neon is

Question # 17

The spectrum emitted from hydrogen filled discharge tube is:

Question # 18

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

Question # 19

Coulomb multiplied by volt by volt gives the unit called:

Question # 20

Braking radiation causes:

Question # 21

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

Question # 22

Lyman series in the spectrum of hydrogen exists in the :

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

X-ray are also known as

Question # 29

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 # 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 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
2 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four
3 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
4 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
5 The range of wavelengths of colurs in the visible colours is
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
6 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)
7 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
8 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
9 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
10 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor

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