ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

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

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

Question # 2

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

Question # 3

The value of the metastable state for Neon is

Question # 4

We can excite an atom by

Question # 5

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

Question # 6

The inkjet printer eject a thin stream of:

Question # 7

Balmer series was identified in:

Question # 8

The range of wavelengths of colurs in the visible colours is

Question # 9

Lyman series in the spectrum of hydrogen exists in the :

Question # 10

CT scanning is the abbreviated name of

Question # 11

The He-Ne laser discharge tube is filled with:

Question # 12

Tick the series which lies in the visible region:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
3 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
4 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
5 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
6 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
7 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
8 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
9 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
10 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

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