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

00:00
Question # 1

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

Question # 2

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

Question # 3

Tick the series which lies in the visible region:

Question # 4

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

Question # 5

A metastable stae:

Question # 6

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 # 7

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

Question # 8

Selenium is:

Question # 9

The value of the metastable state for Neon is

Question # 10

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

Question # 11

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

Question # 12

Lyman series in the spectrum of hydrogen exists in the :

Question # 13

CT scanning is the abbreviated name of

Question # 14

Laser is a beam of:

Question # 15

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

Question # 16

Ultraviolet region lies in ______ series

Question # 17

Braking radiation causes:

Question # 18

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

Question # 19

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

Question # 20

The shell closer to the nucleus is called:

Question # 21

The results of spectra obtained by Blamer were expressed in 1896 by

Question # 22

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

Question # 23

The spectrum emitted from hydrogen filled discharge tube is:

Question # 24

Graph of Black body radiation is example of

Question # 25

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

Question # 26

Coulomb multiplied by volt by volt gives the unit called:

Question # 27

The photocopying process is called:

Question # 28

The electric field lines start from:

Question # 29

Photons must have energy equal to

Question # 30

The inkjet printer eject a thin stream of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
2 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
3 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)
4 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
5 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
6 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
7 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
8 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
9 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
10 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

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