ECAT Pre General Science Physics Chapter 20 MCQ Test With Answer

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 inkjet printer eject a thin stream of:

Question # 2

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

Question # 3

The photocopying process is called:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The shell closer to the nucleus is called:

Question # 8

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

Question # 9

The range of wavelengths of colurs in the visible colours is

Question # 10

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

Question # 11

The process of formation of spectrum is called:

Question # 12

We can excite an atom by

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

Coulomb multiplied by volt by volt gives the unit called:

Question # 17

Gaussian surface is always:

Question # 18

Selenium is:

Question # 19

Lyman series in the spectrum of hydrogen exists in the :

Question # 20

Static electricity is produced by the transfer of:

Question # 21

Photons must have energy equal to

Question # 22

The spectrum emitted from hydrogen filled discharge tube is:

Question # 23

The He-Ne laser discharge tube is filled with:

Question # 24

The life time of metastable state is equal to

Question # 25

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

Question # 26

The value of the metastable state for Neon is

Question # 27

Laser is a beam of:

Question # 28

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

Question # 29

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

Question # 30

Graph of Black body radiation is example of

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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 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
3 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
4 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
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 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
7 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
8 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
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure
9 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
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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