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 transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

Laser is a beam of:

Question # 6

The value of the metastable state for Neon is

Question # 7

The shell closer to the nucleus is called:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

The inkjet printer eject a thin stream of:

Question # 12

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

Question # 13

Ultraviolet region lies in ______ series

Question # 14

The photocopying process is called:

Question # 15

The first shell near the neucles is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
2 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
3 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
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 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second
6 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
7 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
8 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
9 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
10 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these

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