ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

Try The MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

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ECAT Physics Chapter 20 Atomic Spectra

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Question # 1

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

Question # 2

X-ray are also known as

Question # 3

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

Question # 4

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

Question # 5

The spectrum emitted from hydrogen filled discharge tube is:

Question # 6

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

Question # 7

Tick the series which lies in the visible region:

Question # 8

The first shell near the neucles is

Question # 9

Balmer series was identified in:

Question # 10

Coulomb multiplied by volt by volt gives the unit called:

Question # 11

Gaussian surface is always:

Question # 12

The life time of metastable state is equal to

Question # 13

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

Question # 14

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

Question # 15

Ultraviolet region lies in ______ series

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
2 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
3 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
4 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
5 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
6 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
7 In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
A. Helium
B. Neon
C. Both
D. None of these
8 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
9 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
10 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m

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