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 electric field lines start from:

Question # 2

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

Question # 3

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

Question # 4

The first shell near the neucles is

Question # 5

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

Question # 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

Question # 7

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

Question # 8

Balmer series was identified in:

Question # 9

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

Question # 10

The value of the metastable state for Neon is

Question # 11

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

Question # 12

Static electricity is produced by the transfer of:

Question # 13

The inkjet printer eject a thin stream of:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
3 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
4 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
5 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
6 An compared to solid matter, a crack or an air bubble allows:
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these
7 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
8 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)
9 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four
10 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%

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