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

Ultraviolet region lies in ______ series

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

The first series which was identified in the spectrum of hydrogen is called:

Question # 6

By CAT scans, we can detect the density difference of the order of:

Question # 7

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

Question # 8

Photons must have energy equal to

Question # 9

We can excite an atom by

Question # 10

The spectrum emitted from hydrogen filled discharge tube is:

Question # 11

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 # 12

A metastable stae:

Question # 13

Tick the series which lies in the visible region:

Question # 14

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

Question # 15

The photocopying process is called:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
2 The range of wavelengths of colurs in the visible colours is
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
3 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
4 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
5 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
6 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
7 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
8 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
9 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
10 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

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