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

Gaussian surface is always:

Question # 2

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

Question # 3

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

Question # 4

The electric field lines start from:

Question # 5

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

Question # 6

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

Question # 7

We can excite an atom by

Question # 8

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

Question # 9

The inkjet printer eject a thin stream of:

Question # 10

The range of wavelengths of colurs in the visible colours is

Question # 11

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

Question # 12

Selenium is:

Question # 13

The He-Ne laser discharge tube is filled with:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Spectrum represents the number of component colours present in certain light in terms of:
A. Wavelength
B. Frequency
C. Energy
D. Both (A) and (B)
2 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
3 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
4 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
5 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
6 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
7 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
8 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)
9 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
10 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985

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