ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

Try The 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

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

Question # 2

CT scanning is the abbreviated name of

Question # 3

An compared to solid matter, a crack or an air bubble allows:

Question # 4

The value of the metastable state for Neon is

Question # 5

Laser is a beam of:

Question # 6

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

Question # 7

Selenium is:

Question # 8

Balmer series was identified in:

Question # 9

Gaussian surface is always:

Question # 10

The life time of metastable state is equal to

Question # 11

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

Question # 12

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

Question # 13

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 # 14

The electric field lines start from:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
2 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
3 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
4 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
5 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
6 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
7 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
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
8 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
9 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
10 The range of wavelengths of colurs in the visible colours is
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm

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