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

00:00
Question # 1

Ultraviolet region lies in ______ series

Question # 2

Balmer series was identified in:

Question # 3

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 4

Coulomb multiplied by volt by volt gives the unit called:

Question # 5

X-ray are also known as

Question # 6

The spectrum emitted from hydrogen filled discharge tube is:

Question # 7

Tick the series which lies in the visible region:

Question # 8

A metastable stae:

Question # 9

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

Question # 10

The photocopying process is called:

Question # 11

The range of wavelengths of colurs in the visible colours is

Question # 12

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

Question # 13

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

Question # 14

Photons must have energy equal to

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 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
4 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
5 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
6 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
7 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
8 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
9 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
10 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985

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