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

CT scanning is the abbreviated name of

Question # 2

We can excite an atom by

Question # 3

The shell closer to the nucleus is called:

Question # 4

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

Question # 5

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

Question # 6

The value of the metastable state for Neon is

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

Gaussian surface is always:

Question # 9

Photons must have energy equal to

Question # 10

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

Question # 11

The photocopying process is called:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

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

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

The spectrum emitted from hydrogen filled discharge tube is:

Question # 21

Lyman series in the spectrum of hydrogen exists in the :

Question # 22

The natural arrangement of colours in the spectrum of white light spectrum is

Question # 23

The first series which was identified in the spectrum of hydrogen is called:

Question # 24

The He-Ne laser discharge tube is filled with:

Question # 25

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

Question # 26

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

Question # 27

The range of wavelengths of colurs in the visible colours is

Question # 28

X-ray are also known as

Question # 29

Tick the series which lies in the visible region:

Question # 30

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
3 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
4 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
5 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
6 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
7 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
8 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
9 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
10 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

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