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 electric field lines start from:

Question # 2

The range of wavelengths of colurs in the visible colours is

Question # 3

CT scanning is the abbreviated name of

Question # 4

Coulomb multiplied by volt by volt gives the unit called:

Question # 5

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

Question # 6

Ultraviolet region lies in ______ series

Question # 7

The natural arrangement of colours in the spectrum of white light spectrum is

Question # 8

The value of the metastable state for Neon is

Question # 9

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

Question # 10

Selenium is:

Question # 11

We can excite an atom by

Question # 12

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

Question # 13

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

Question # 14

Photons must have energy equal to

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
2 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
3 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)
4 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
5 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
6 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
7 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
8 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
9 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes
10 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these

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