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

Question # 2

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

Question # 3

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

Question # 4

X-ray are also known as

Question # 5

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

Question # 6

The first shell near the neucles is

Question # 7

Laser is a beam of:

Question # 8

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

Question # 9

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

Question # 10

A metastable stae:

Question # 11

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

Question # 12

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

Question # 13

The shell closer to the nucleus is called:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
3 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
4 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
5 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
6 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
7 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
8 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
9 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
10 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket

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