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

Question # 2

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

Question # 3

We can excite an atom by

Question # 4

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

Question # 5

The He-Ne laser discharge tube is filled with:

Question # 6

Selenium is:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

A metastable stae:

Question # 11

The electric field lines start from:

Question # 12

The spectrum emitted from hydrogen filled discharge tube is:

Question # 13

CT scanning is the abbreviated name of

Question # 14

Gaussian surface is always:

Question # 15

Lyman series in the spectrum of hydrogen exists in the :

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
2 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
3 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four
4 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
5 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
6 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
7 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
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 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
10 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique

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