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

Coulomb multiplied by volt by volt gives the unit called:

Question # 2

Photons must have energy equal to

Question # 3

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

Question # 4

The He-Ne laser discharge tube is filled with:

Question # 5

Ultraviolet region lies in ______ series

Question # 6

Gaussian surface is always:

Question # 7

The spectrum emitted from hydrogen filled discharge tube is:

Question # 8

The process of formation of spectrum is called:

Question # 9

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 # 10

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

Question # 11

The life time of metastable state is equal to

Question # 12

Braking radiation causes:

Question # 13

We can excite an atom by

Question # 14

The value of the metastable state for Neon is

Question # 15

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

Question # 16

Lyman series in the spectrum of hydrogen exists in the :

Question # 17

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

Question # 18

The inkjet printer eject a thin stream of:

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

Static electricity is produced by the transfer of:

Question # 23

Laser is a beam of:

Question # 24

A metastable stae:

Question # 25

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

Question # 26

X-ray are also known as

Question # 27

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

Question # 28

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

Question # 29

The shell closer to the nucleus is called:

Question # 30

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
2 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
3 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
4 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
5 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
6 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
7 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
8 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four
9 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
10 Energy required by an electron revolving in certain orbit to jump to an excited state is called:
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential

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