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

00:00
Question # 1

The shell closer to the nucleus is called:

Question # 2

Photons must have energy equal to

Question # 3

The process of formation of spectrum is called:

Question # 4

The value of the metastable state for Neon is

Question # 5

Laser is a beam of:

Question # 6

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

Question # 7

CT scanning is the abbreviated name of

Question # 8

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 # 9

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

Question # 10

Graph of Black body radiation is example of

Question # 11

Tick the series which lies in the visible region:

Question # 12

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

Question # 13

Static electricity is produced by the transfer of:

Question # 14

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

Question # 15

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

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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 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
3 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
4 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
5 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
6 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
7 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
8 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
9 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
10 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All

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