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

The natural arrangement of colours in the spectrum of white light spectrum is

Question # 2

Laser is a beam of:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The inkjet printer eject a thin stream of:

Question # 8

We can excite an atom by

Question # 9

Selenium is:

Question # 10

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

Question # 11

Graph of Black body radiation is example of

Question # 12

The results of spectra obtained by Balmer were expressed in 1896 by:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
3 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
4 An compared to solid matter, a crack or an air bubble allows:
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these
5 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
6 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
7 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
8 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
9 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
10 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

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  • Salmankhan

    Salmankhan

    01 Feb 2018

    Some mcqs having wrong answers.

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