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

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

Question # 2

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

Question # 3

Photons must have energy equal to

Question # 4

Braking radiation causes:

Question # 5

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

Question # 6

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

Question # 7

X-rays can penetrate in a solid matte through a distance of several:

Question # 8

Graph of Black body radiation is example of

Question # 9

The inkjet printer eject a thin stream of:

Question # 10

Static electricity is produced by the transfer of:

Question # 11

Tick the series which lie/s in. the infra-red region.

Question # 12

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

Question # 13

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

Question # 14

The first shell near the neucles is

Question # 15

The life time of metastable state is equal to

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region
2 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
3 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)
4 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
5 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
6 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
7 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
8 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
9 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
10 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

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