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 range of wavelengths of colurs in the visible colours is

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

The process of formation of spectrum is called:

Question # 6

Selenium is:

Question # 7

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

Question # 8

Photons must have energy equal to

Question # 9

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

Question # 10

Braking radiation causes:

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

Ultraviolet region lies in ______ series

Question # 13

The shell closer to the nucleus is called:

Question # 14

The first shell near the neucles is

Question # 15

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

Question # 16

X-ray are also known as

Question # 17

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

Question # 18

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

Question # 19

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 # 20

The inkjet printer eject a thin stream of:

Question # 21

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

Question # 22

Balmer series was identified in:

Question # 23

A metastable stae:

Question # 24

Coulomb multiplied by volt by volt gives the unit called:

Question # 25

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

Question # 26

Lyman series in the spectrum of hydrogen exists in the :

Question # 27

The value of the metastable state for Neon is

Question # 28

Static electricity is produced by the transfer of:

Question # 29

CT scanning is the abbreviated name of

Question # 30

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
2 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
3 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
4 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
5 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
6 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
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
7 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
8 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
9 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
10 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor

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