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

Gaussian surface is always:

Question # 2

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

Question # 3

Laser is a beam of:

Question # 4

Tick the series which lies in the visible region:

Question # 5

A metastable stae:

Question # 6

The photocopying process is called:

Question # 7

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

Question # 8

Graph of Black body radiation is example of

Question # 9

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

Question # 10

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

Question # 11

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 # 12

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

Question # 13

Static electricity is produced by the transfer of:

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

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

Question # 17

The shell closer to the nucleus is called:

Question # 18

The first shell near the neucles is

Question # 19

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

Question # 20

Coulomb multiplied by volt by volt gives the unit called:

Question # 21

The inkjet printer eject a thin stream of:

Question # 22

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

Question # 23

Braking radiation causes:

Question # 24

The value of the metastable state for Neon is

Question # 25

The spectrum emitted from hydrogen filled discharge tube is:

Question # 26

CT scanning is the abbreviated name of

Question # 27

The electric field lines start from:

Question # 28

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

Question # 29

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

Question # 30

We can excite an atom by

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
2 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
3 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
4 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
5 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
6 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
7 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
8 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
9 The range of wavelengths of colurs in the visible colours is
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
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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