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

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

Question # 2

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

Question # 3

The shell closer to the nucleus is called:

Question # 4

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

Question # 5

X-ray are also known as

Question # 6

Braking radiation causes:

Question # 7

Laser is a beam of:

Question # 8

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

Question # 9

We can excite an atom by

Question # 10

The He-Ne laser discharge tube is filled with:

Question # 11

Photons must have energy equal to

Question # 12

Gaussian surface is always:

Question # 13

The range of wavelengths of colurs in the visible colours is

Question # 14

The inkjet printer eject a thin stream of:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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)
2 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
3 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
4 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)
5 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
6 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
7 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
8 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
9 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
10 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

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