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

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

Question # 2

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 # 3

CT scanning is the abbreviated name of

Question # 4

The range of wavelengths of colurs in the visible colours is

Question # 5

The spectrum emitted from hydrogen filled discharge tube 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 first shell near the neucles is

Question # 9

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

Question # 10

The inkjet printer eject a thin stream of:

Question # 11

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

Question # 12

X-ray are also known as

Question # 13

Lyman series in the spectrum of hydrogen exists in the :

Question # 14

Ultraviolet region lies in ______ series

Question # 15

We can excite an atom by

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
2 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region
3 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
4 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
5 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
6 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
7 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
8 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)
9 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
10 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these

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