ECAT Pre General Science Physics Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 20 Atomic Spectra

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 20 Atomic Spectra

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ECAT Pre General Science Physics Chapter 20 Atomic Spectra

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Question # 1

The life time of metastable state is equal to

Question # 2

Laser is a beam of:

Question # 3

The photocopying process is called:

Question # 4

CT scanning is the abbreviated name of

Question # 5

The inkjet printer eject a thin stream of:

Question # 6

The process of formation of spectrum is called:

Question # 7

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

Question # 8

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

Question # 9

If the distance between two charges is doubled,the force between them will become:

Question # 10

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

Question # 11

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 # 12

The shell closer to the nucleus is called:

Question # 13

Spectrum represents the number of component colours present in certain light in terms of:

Question # 14

The spectrum emitted from hydrogen filled discharge tube is:

Question # 15

X-ray are also known as

Question # 16

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

Question # 17

The He-Ne laser discharge tube is filled with:

Question # 18

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

Question # 19

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

Question # 20

Lyman series in the spectrum of hydrogen exists in the :

Question # 21

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

Question # 22

Coulomb multiplied by volt by volt gives the unit called:

Question # 23

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

Question # 24

Ultraviolet region lies in ______ series

Question # 25

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

Question # 26

Braking radiation causes:

Question # 27

X-rays can penetrate in a solid matte through a distance of several:

Question # 28

Photons must have energy equal to

Question # 29

The electric field lines start from:

Question # 30

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
2 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
3 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
4 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
5 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
6 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
7 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
8 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
9 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
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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