ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

Try The MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

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ECAT Physics Chapter 20 Atomic Spectra

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Question # 1

Coulomb multiplied by volt by volt gives the unit called:

Question # 2

The spectrum emitted from hydrogen filled discharge tube is:

Question # 3

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

Question # 4

Braking radiation causes:

Question # 5

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

Question # 6

Selenium is:

Question # 7

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

Question # 8

The first series which was identified in the spectrum of hydrogen 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

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

Question # 11

The life time of metastable state is equal to

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Photons must have energy equal to

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
2 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
3 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
4 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
5 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
6 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
7 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
8 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
9 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)
10 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

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