ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

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 results of spectra obtained by Blamer were expressed in 1896 by

Question # 2

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

Question # 3

Braking radiation causes:

Question # 4

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

Question # 5

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

Question # 6

X-ray are also known as

Question # 7

The electric field lines start from:

Question # 8

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

Question # 9

Photons must have energy equal to

Question # 10

The inkjet printer eject a thin stream of:

Question # 11

Tick the series which lies in the visible region:

Question # 12

Ultraviolet region lies in ______ series

Question # 13

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

Question # 14

Graph of Black body radiation is example of

Question # 15

Laser is a beam of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
2 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
3 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
4 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
5 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
6 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
7 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
8 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
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 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV

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