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 life time of metastable state is equal to

Question # 2

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 # 3

Lyman series in the spectrum of hydrogen exists in the :

Question # 4

The range of wavelengths of colurs in the visible colours is

Question # 5

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

Question # 6

Balmer series was identified in:

Question # 7

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

Question # 8

The shell closer to the nucleus is called:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

Laser is a beam of:

Question # 14

The electric field lines start from:

Question # 15

The He-Ne laser discharge tube is filled with:

Question # 16

Coulomb multiplied by volt by volt gives the unit called:

Question # 17

Photons must have energy equal to

Question # 18

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

Question # 19

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

Question # 20

The inkjet printer eject a thin stream of:

Question # 21

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

Question # 22

The value of the metastable state for Neon is

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

We can excite an atom by

Question # 28

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

Question # 29

Graph of Black body radiation is example of

Question # 30

X-ray are also known as

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
2 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
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 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
5 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
6 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
7 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)
8 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
9 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
10 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

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