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

Static electricity is produced by the transfer of:

Question # 2

The holes created in the L and M shells are occupied by transitions of:

Question # 3

The range of wavelengths of colurs in the visible colours is

Question # 4

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

Question # 5

The results of spectra obtained by Balmer were expressed in 1896 by:

Question # 6

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

Question # 7

The first shell near the neucles is

Question # 8

Coulomb multiplied by volt by volt gives the unit called:

Question # 9

Balmer series was identified in:

Question # 10

The electric field lines start from:

Question # 11

Gaussian surface is always:

Question # 12

Lyman series in the spectrum of hydrogen exists in the :

Question # 13

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

Question # 14

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

Question # 15

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
2 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
3 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
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 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
6 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
7 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
8 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
9 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
10 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

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