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

Coulomb multiplied by volt by volt gives the unit called:

Question # 2

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

Question # 3

The spectrum emitted from hydrogen filled discharge tube is:

Question # 4

Graph of Black body radiation is example of

Question # 5

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

Question # 6

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

Question # 7

Gaussian surface is always:

Question # 8

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

Question # 9

Ultraviolet region lies in ______ series

Question # 10

Lyman series in the spectrum of hydrogen exists in the :

Question # 11

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

Question # 12

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

Question # 13

Balmer series was identified in:

Question # 14

The shell closer to the nucleus is called:

Question # 15

The first shell near the neucles is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
3 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
4 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
5 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
6 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
7 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
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 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
10 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique

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