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

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

Question # 2

Balmer series was identified in:

Question # 3

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

Question # 4

Coulomb multiplied by volt by volt gives the unit called:

Question # 5

Graph of Black body radiation is example of

Question # 6

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

Question # 7

An electron of the hydrogen atom in the second orbit is called its:

Question # 8

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

Question # 9

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

Question # 10

X-ray are also known as

Question # 11

Static electricity is produced by the transfer of:

Question # 12

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

Question # 13

Selenium is:

Question # 14

Gaussian surface is always:

Question # 15

The electric field lines start from:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
2 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
3 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
4 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
5 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
6 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
7 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)
8 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
9 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
10 The first series which was identified in the spectrum of hydrogen is called:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series

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