ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

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

Braking radiation causes:

Question # 2

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

Question # 3

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

Question # 4

The shell closer to the nucleus is called:

Question # 5

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

Question # 6

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

Question # 7

The results of spectra obtained by Blamer were expressed in 1896 by

Question # 8

The holes created in the L and M shells are occupied by transitions of:

Question # 9

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

Question # 10

We can excite an atom by

Question # 11

Gaussian surface is always:

Question # 12

The inkjet printer eject a thin stream of:

Question # 13

Laser is a beam of:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
2 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second
3 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
4 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
5 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
6 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
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
7 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
8 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
9 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)
10 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true

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