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

Photons must have energy equal to

Question # 2

Laser is a beam of:

Question # 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

Question # 4

The life time of metastable state is equal to

Question # 5

The inkjet printer eject a thin stream of:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

Selenium is:

Question # 10

We can excite an atom by

Question # 11

The shell closer to the nucleus is called:

Question # 12

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

Question # 13

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

Question # 14

Gaussian surface is always:

Question # 15

Balmer series was identified in:

Question # 16

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

Question # 17

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

Question # 18

Coulomb multiplied by volt by volt gives the unit called:

Question # 19

Braking radiation causes:

Question # 20

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 # 21

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

Question # 22

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

Question # 23

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

Question # 24

The He-Ne laser discharge tube is filled with:

Question # 25

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

Question # 26

Static electricity is produced by the transfer of:

Question # 27

The spectrum emitted from hydrogen filled discharge tube is:

Question # 28

The range of wavelengths of colurs in the visible colours is

Question # 29

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

Question # 30

The holes created in the L and M shells are occupied by transitions 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 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
3 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
4 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
5 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
6 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
7 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
8 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
9 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
10 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell

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