ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Question # 1

Graph of Black body radiation is example of

Question # 2

The electric field lines start from:

Question # 3

Balmer series was identified in:

Question # 4

The shell closer to the nucleus is called:

Question # 5

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

Question # 6

The range of wavelengths of colurs in the visible colours is

Question # 7

Gaussian surface is always:

Question # 8

A metastable stae:

Question # 9

Ultraviolet region lies in ______ series

Question # 10

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

Question # 11

The results of spectra obtained by Blamer were expressed in 1896 by

Question # 12

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

Question # 13

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

Question # 14

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

Question # 15

The value of the metastable state for Neon is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
3 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
4 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
5 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
6 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
7 The range of wavelengths of colurs in the visible colours is
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
8 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
9 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
10 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series

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