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

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

Question # 2

We can excite an atom by

Question # 3

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

Question # 4

Gaussian surface is always:

Question # 5

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

Question # 6

X-ray are also known as

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

CT scanning is the abbreviated name of

Question # 11

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

Question # 12

The range of wavelengths of colurs in the visible colours is

Question # 13

Lyman series in the spectrum of hydrogen exists in the :

Question # 14

The spectrum emitted from hydrogen filled discharge tube is:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
2 In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
A. Helium
B. Neon
C. Both
D. None of these
3 An compared to solid matter, a crack or an air bubble allows:
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these
4 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
5 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
6 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
7 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
8 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
9 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
10 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
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure

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