ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

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

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

Question # 2

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

Question # 3

Selenium is:

Question # 4

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

Question # 5

Graph of Black body radiation is example of

Question # 6

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

Question # 7

Ultraviolet region lies in ______ series

Question # 8

A metastable stae:

Question # 9

Coulomb multiplied by volt by volt gives the unit called:

Question # 10

We can excite an atom by

Question # 11

Gaussian surface is always:

Question # 12

The photocopying process is called:

Question # 13

Balmer series was identified in:

Question # 14

Tick the series which lies in the visible region:

Question # 15

Static electricity is produced by the transfer of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
2 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
3 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
4 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
5 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
6 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
7 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
8 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
9 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
10 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985

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