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

Tick the series which lies in the visible region:

Question # 2

Balmer series was identified in:

Question # 3

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 # 4

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

Question # 5

The He-Ne laser discharge tube is filled with:

Question # 6

The process of formation of spectrum is called:

Question # 7

Laser is a beam of:

Question # 8

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

Question # 9

Gaussian surface is always:

Question # 10

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

Question # 11

We can excite an atom by

Question # 12

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Question # 13

The photocopying process is called:

Question # 14

Ultraviolet region lies in ______ series

Question # 15

Photons must have energy equal to

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ECAT Class 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 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
3 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
4 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
5 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes
6 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
7 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
8 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
9 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
10 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true

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