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

Laser is a beam of:

Question # 2

A metastable stae:

Question # 3

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

Question # 4

Gaussian surface is always:

Question # 5

X-rays can penetrate in a solid matte through a distance of several:

Question # 6

Photons must have energy equal to

Question # 7

Lyman series in the spectrum of hydrogen exists in the :

Question # 8

Balmer series was identified in:

Question # 9

The first shell near the neucles is

Question # 10

Balmer series lies in that region of electromagnetic wave spectrum which is called:

Question # 11

Ultraviolet region lies in ______ series

Question # 12

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

Question # 13

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

Question # 14

X-ray are also known as

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes
2 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
3 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
4 Energy required by an electron revolving in certain orbit to jump to an excited state is called:
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential
5 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
6 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
7 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
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 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
10 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

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