ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Question # 1

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

Question # 2

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

Question # 3

The life time of metastable state is equal to

Question # 4

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

Question # 5

The range of wavelengths of colurs in the visible colours is

Question # 6

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

Question # 7

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

Question # 8

Selenium is:

Question # 9

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

Question # 10

The value of the metastable state for Neon is

Question # 11

Lyman series in the spectrum of hydrogen exists in the :

Question # 12

Tick the series which lies in the visible region:

Question # 13

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

Question # 14

The process of formation of spectrum is called:

Question # 15

CT scanning is the abbreviated name of

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
2 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
3 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)
4 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
5 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
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 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
9 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
10 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms

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