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

  • Total Questions15

  • Time Allowed20

Start Test Download PDF

Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

00:00
Question # 1

The He-Ne laser discharge tube is filled with:

Question # 2

Photons must have energy equal to

Question # 3

Coulomb multiplied by volt by volt gives the unit called:

Question # 4

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

Question # 5

The results of spectra obtained by Balmer were expressed in 1896 by:

Question # 6

The life time of metastable state is equal to

Question # 7

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

Question # 8

The inkjet printer eject a thin stream of:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

We can excite an atom by

Submit

Prepare Complete Set Wise Physics ECAT Pre Engineering Chapter 20 Atomic Spectra MCQs Online With Answers


Topic Test

00:00
Submit

Top Scorers Of Physics ECAT Pre Engineering Chapter 20 Atomic Spectra MCQ`s Test

  • A
    Arian Ahmed 12 - Mar - 2024 00 Min 03 Sec 60/60
  • F
    Farzand Shah Farzand Shah 01 - Jun - 2024 00 Min 44 Sec 60/60
  • S
    suzi 11 - Feb - 2026 00 Min 45 Sec 60/60
  • B
    Bilal Javed 07 - Mar - 2024 01 Min 33 Sec 60/60
  • H
    Huzaifa Asim 26 - May - 2024 13 Min 32 Sec 60/60
  • M
    M Umer Arain 24 - Dec - 2024 00 Min 07 Sec 55/60
  • A
    Anibullah Anib 07 - Mar - 2024 01 Min 57 Sec 55/60
  • T
    Tamshi Sohail 03 - May - 2024 02 Min 37 Sec 55/60
  • C
    Chhabibullah1492 Habib 07 - Mar - 2024 05 Min 43 Sec 55/60
  • M
    Malaika Waqar 23 - Apr - 2024 06 Min 21 Sec 55/60
  • S
    Shamshad 27 - May - 2024 01 Min 13 Sec 50/60
  • S
    Sammad Ali 30 - May - 2024 01 Min 20 Sec 50/60
  • A
    Ayesha Ch 06 - Mar - 2024 01 Min 33 Sec 50/60
  • M
    m imran 18 - May - 2024 02 Min 16 Sec 50/60
  • C
    Computer mail 28 - Apr - 2026 03 Min 26 Sec 48/60

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 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
3 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
4 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
5 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
6 The first series which was identified in the spectrum of hydrogen is called:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
7 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
8 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
9 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
10 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford

Test Questions