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

Gaussian surface is always:

Question # 2

Photons must have energy equal to

Question # 3

Static electricity is produced by the transfer of:

Question # 4

Laser is a beam of:

Question # 5

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 6

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

Question # 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

Question # 8

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

Question # 9

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

Question # 10

Coulomb multiplied by volt by volt gives the unit called:

Question # 11

We can excite an atom by

Question # 12

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

Question # 13

The holes created in the L and M shells are occupied by transitions of:

Question # 14

CT scanning is the abbreviated name of

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
3 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
4 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
5 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
6 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
7 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
8 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
9 The first series which was identified in the spectrum of hydrogen is called:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
10 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second

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