ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Question # 1

Static electricity is produced by the transfer of:

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The spectrum emitted from hydrogen filled discharge tube is:

Question # 8

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 # 9

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

Question # 10

The range of wavelengths of colurs in the visible colours is

Question # 11

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

Question # 12

Balmer series was identified in:

Question # 13

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

Question # 14

X-ray are also known as

Question # 15

We can excite an atom by

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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)
2 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
3 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
4 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
5 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
6 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
7 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)
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 process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
10 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

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