The characteristic X-rays spectrum is due to_____________?

Related Mcqs:

1. In hydrogen spectrum which one of the following series lies in the ultraviolet region ?

   A. Balmer series
   B. Pfund series
   C. Bracket series
   D. Lymann series

2. Total number of series in hydrogen spectrum is_____________?

   A. three
   B. four
   C. five
   D. six

3. Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?

   A. Number of incident electron i.e. filament current
   B. The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated
   C. The soft target which can easily emit electrons
   D. All of above are correct

4. What is wavelength of visible spectrum?

   A. 8500 – 9800 angstrom
   B. 7800 – 8000 angstrom
   C. 3900 – 7600 angstrom
   D. 1300 – 3000 angstrom

   Submitted by: Engr Allah Wadhayo

5. The penetrating power of X-rays depends on their______________?

   A. applied voltage
   B. frequency
   C. source
   D. all of the above

6. X-rays are similar in nature to_______________?

   A. Cathode rays
   B. Positive rays
   C. γ-rays
   D. Beta rays

7. When X-rays are passed through successive aluminum sheets what happens to their thickness ?

   A. increases
   B. it decreases
   C. it remains same
   D. sometimes increases and sometimes decreases

8. Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?

   A. A & B
   B. B & C
   C. A & C
   D. A B & C

9. The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?

   A. 6.2 x 10-10m
   B. 9.1 x 10-18m
   C. 3.11 x 10-10m
   D. 4 x 10-10m

10. X-rays are diffracted by a crystal but not by a diffraction grating because_____________?

    A. The ions in a crystal are well arranged
    B. The lines in a diffraction grating cannot reflect X-rays.
    C. The penetration power of X-rays is high in a diffraction grating
    D. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal