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

Balmer series was identified in:

Question # 2

The range of wavelengths of colurs in the visible colours is

Question # 3

Photons must have energy equal to

Question # 4

A metastable stae:

Question # 5

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 # 6

We can excite an atom by

Question # 7

Graph of Black body radiation is example of

Question # 8

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

Question # 9

The value of the metastable state for Neon is

Question # 10

Tick the series which lies in the visible region:

Question # 11

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

Question # 12

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

Question # 13

The results of spectra obtained by Balmer were expressed in 1896 by:

Question # 14

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Question # 15

Spectrum represents the number of component colours present in certain light in terms of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
2 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
3 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
4 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
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 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
7 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
8 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
9 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
10 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

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