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

Coulomb multiplied by volt by volt gives the unit called:

Question # 3

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

Question # 4

The first series which was identified in the spectrum of hydrogen is called:

Question # 5

Graph of Black body radiation is example of

Question # 6

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

Question # 7

An electron of the hydrogen atom in the second orbit is called its:

Question # 8

Ultraviolet region lies in ______ series

Question # 9

Laser is a beam of:

Question # 10

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

Question # 11

CT scanning is the abbreviated name of

Question # 12

Lyman series in the spectrum of hydrogen exists in the :

Question # 13

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

Question # 14

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

Question # 15

The electric field lines start from:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
2 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
3 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
4 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
5 Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
6 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
7 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
8 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)
9 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
10 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only

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