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

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

Question # 2

Laser is a beam of:

Question # 3

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

Question # 4

The He-Ne laser discharge tube is filled with:

Question # 5

Gaussian surface is always:

Question # 6

The electric field lines start from:

Question # 7

Braking radiation causes:

Question # 8

The range of wavelengths of colurs in the visible colours is

Question # 9

Balmer series was identified in:

Question # 10

Photons must have energy equal to

Question # 11

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

Question # 12

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

Question # 13

Static electricity is produced by the transfer of:

Question # 14

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

Question # 15

Graph of Black body radiation is example of

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
2 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
3 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
4 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
5 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
6 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
7 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
8 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
9 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
10 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

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