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

Selenium is:

Question # 2

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

Question # 3

The first shell near the neucles is

Question # 4

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

Question # 5

Coulomb multiplied by volt by volt gives the unit called:

Question # 6

The shell closer to the nucleus is called:

Question # 7

Laser is a beam of:

Question # 8

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Question # 9

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

Question # 10

The value of the metastable state for Neon is

Question # 11

Static electricity is produced by the transfer of:

Question # 12

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

Question # 13

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

Question # 14

The life time of metastable state is equal to

Question # 15

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

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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 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
3 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
4 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
5 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
6 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
7 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
8 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
9 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
10 Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure

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