ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Question # 1

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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The value of the metastable state for Neon is

Question # 7

The first shell near the neucles is

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Lyman series in the spectrum of hydrogen exists in the :

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
2 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
3 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
4 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
5 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
6 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
7 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
8 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
9 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
10 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell

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