This set of Engineering Physics Multiple Choice Questions & Answers (MCQs) focuses on “X Rays”.
1. In X-ray emission tubes, X-ray is emitted by the acceleration of ________________
Explanation: In X-ray emission tubes, the electrons are accelerated by a very high voltage and then decelerated very fast by introducing a metal plate. In this process, the Kinetic energy of electrons is converted into light energy and, thus, X-ray is emitted.
2. The wavelength range of X-rays is _____________
a) 1 mm to 700 nm
b) 400 nm to 1 nm
c) 1 nm to 0.001 nm
d) 0.1 m to 1 mm
Explanation: X-ray lies beyond the UV region of the electromagnetic spectrum. Its wavelength range is from 1 nm to 0.001 nm. Beyond X-rays lies Gamma rays.
3. X-Rays are not used in _____________
a) Photographic film
c) Geiger tubes
d) Ionization Chamber
Explanation: X-rays are used in Photographic film, Geiger tubes, and Ionization chambers. For Photocells, visible light or Ultraviolet light is used.
4. X-rays possess electromagnetic character.
Explanation: X-ray is an electromagnetic wave. It lies in the electromagnetic spectrum. X-rays are not deflected by magnetic and electric fields.
5. X-rays are produced effectively electrons when they strike ____________
a) Dense metal anode
b) Dense Metal cathode
c) Fluorescent metal
Explanation: In 1895, Wilhelm Roentgen observed that when high energy electrons strike the dense metal anode, some rays are emitted which have high penetrating power.
6. The synchrotron radiation emitted is Polarized.
Explanation: When electrons are accelerated using synchrotron, radiation called synchrotron radiation is emitted. This radiation is polarized as the electric and magnetic fields of the photons all lie in the same direction.
7. The celestial source of X-ray is _______________
c) Black Holes
Explanation: In close binary systems containing black holes or neutron stars, X-rays are created. In these systems, the more massive and compact stellar remnant strips material from its companion star to form a disk of extremely hot X-ray-emitting gas as it spirals inward.
8. Which of the following disease can be detected by X-Ray?
a) Bladder infection
Explanation: After taking a chest x-ray test, pneumonia can be diagnosed. If there are white spots on the lungs, it means that the person has pneumonia.
9. X-ray crystallography uses which characteristic of light?
Explanation: X-ray crystallography is used to identify the molecular and atomic structure of the crystal. The crystal diffracts the incident X-ray beam. By measuring the intensities and angle of these diffracted beams, the molecular structure of the crystal can be evaluated.
Explanation: The given figure shows the procedure of X-ray crystallography. An X-ray beam is incident on a crystal, which causes it to diffract. Now, by observing the diffraction pattern, the molecular structure of the crystal can be identified.
Sanfoundry Global Education & Learning Series – Engineering Physics.
To practice all areas of Engineering Physics, here is complete set of 1000+ Multiple Choice Questions and Answers.