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

Selenium is:

Question # 2

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

Question # 3

Static electricity is produced by the transfer of:

Question # 4

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 # 5

Laser is a beam of:

Question # 6

The first shell near the neucles is

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

The spectrum emitted from hydrogen filled discharge tube is:

Question # 13

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

Question # 14

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

Question # 15

The process of formation of spectrum is called:

Question # 16

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

Question # 17

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

Question # 18

Gaussian surface is always:

Question # 19

The He-Ne laser discharge tube is filled with:

Question # 20

The electric field lines start from:

Question # 21

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 # 22

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

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

Graph of Black body radiation is example of

Question # 27

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

Question # 28

Ultraviolet region lies in ______ series

Question # 29

We can excite an atom by

Question # 30

The value of the metastable state for Neon is

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