ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

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

Question # 2

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

Question # 3

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

Question # 4

Graph of Black body radiation is example of

Question # 5

Gaussian surface is always:

Question # 6

The value of the metastable state for Neon is

Question # 7

Static electricity is produced by the transfer of:

Question # 8

X-ray are also known as

Question # 9

The lasing or active medium in He-Ne laser discharge tube is:

Question # 10

The inkjet printer eject a thin stream of:

Question # 11

The photocopying process is called:

Question # 12

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

Question # 13

Laser is a beam of:

Question # 14

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

Question # 15

CT scanning is the abbreviated name of

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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)
2 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
3 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
4 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
5 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
6 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
7 In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
A. Short wavelength
B. Large wavelength
C. Very large wavelenth
D. Low frequency
8 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
9 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
10 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV

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