ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

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

Try The 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

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 # 2

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

Question # 3

The range of wavelengths of colurs in the visible colours is

Question # 4

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

Question # 5

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

Question # 6

X-ray are also known as

Question # 7

The life time of metastable state is equal to

Question # 8

Braking radiation causes:

Question # 9

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

Question # 10

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

Question # 11

Photons must have energy equal to

Question # 12

By CAT scans, we can detect the density difference of the order of:

Question # 13

Selenium is:

Question # 14

A metastable stae:

Question # 15

Coulomb multiplied by volt by volt gives the unit called:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
3 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
4 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
5 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
6 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
7 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
8 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
9 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
10 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule

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