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

Graph of Black body radiation is example of

Question # 2

Gaussian surface is always:

Question # 3

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 # 4

CT scanning is the abbreviated name of

Question # 5

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

Question # 6

The electric field lines start from:

Question # 7

Laser is a beam of:

Question # 8

X-ray are also known as

Question # 9

The photocopying process is called:

Question # 10

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

Question # 11

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

Question # 12

Balmer series was identified in:

Question # 13

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

Question # 14

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

Question # 15

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

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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 In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
A. Short wavelength
B. Large wavelength
C. Very large wavelenth
D. Low frequency
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 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
5 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
6 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
7 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
8 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)
9 Spectrum represents the number of component colours present in certain light in terms of:
A. Wavelength
B. Frequency
C. Energy
D. Both (A) and (B)
10 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All

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