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Contributed by: Datu Totong
  • 1. ________Base of the commercial glass.
A) Potash
B) Lime
C) Silica
D) Soda
  • 2. ________Use for chemical durability and resistance to devitrification.
A) Silica
B) Lime
C) Potash
D) Soda
  • 3. _______Supercooled liquid possesses high viscosity and rigidity.
A) Alumina
B) Magnesia
C) Glass
  • 4. _________A rapid and convenient way of determining the density of small glass fragments
A) Immersion method
B) Flotation method
  • 5. ______A rapid examination and an adequate method for glass analysis since it requires only a small number of samples.
A) Ultraviolet light examination
B) Spectographic test
C) Physical properties examination
D) X-ray diffraction test
  • 6. _______Gives the glass greater chemical durability, lower coefficient of expansion and greater freedom from devitrification.
A) Alumina
B) Magnesia
C) Potash
  • 7. _______Excessive flaking on the right side of the windowpane would indicate a shot fired came from which directions?
A) At angle from the left
B) At angle from the right
  • 8. _______Method used to measure the refractive index of a glass. It may be mentioned that two glasses from independent sources can vary conceivably have the same index of refraction or the same density.
A) Flotation method
B) Immersion method
  • 9. ________ From what direction did the shot come if the flakes mark the windowpane is evenly distributed?
A) Outside the hole
B) Perpendicular to the windowpane
C) Around the hole
  • 10. Which does not belong to the group?
A) spectrographic test
B) X-ray diffraction test
C) Ultraviolet experiment test.
D) Polish test
  • 11. The principle of 3R's rule states that.
A) Stress lines on a concentric crack will be at right angle to rear side.
B) Stress lines on a radial crack will be at right angle to the rear side of the glass.
C) Stress lines on a concentric crack will be at right angle to the front side.
D) Stress lines on a radial crack will be at right angle to the front side of the glass
  • 12. If an automobile or any vehicle is discovered in which fragments of the lens can be found, employing the method of analysis for glass.
A) Analysis of glass from vehicle
B) automobile glass analysis
C) Analysis of glass from accident
D) analysis of broken glass
  • 13. The padial crack does not extend to the side of impact and the spiral crack does not extend to the other side.
A) Fractures on commercial glass
B) Fractures of windowpane
C) Fractures of broken window
D) Fractures on safety glass
  • 14. fractures from the________ shot will be interrupted and end-stopped at point where they intersect.
A) Third
B) Fourth
C) Second
D) First
  • 15. Characteristics we needed so that the minute lines and ridges in the impression do not break or disuntegrate
A) It must be easy to apply.
B) Must not have the tendency to adhere to the impression
C) Should not injure the impression
D) Must harden rapidly to a rigid mass
  • 16. Wood's metal is made of B, Pb, Sn, and Cd. What is the amount in percentage of these elements in the materials.
A) Pb 50%, Cd 12.5%, Sn 25%, B 12.5%
B) B 12%, Sn 25%, Pb 12.5%, Cd 50%
C) Sn 12.5%, B 25%, Cd 12.5%, Pb 50%
D) Cd 12.5%, Pb 25%, Ð’ 50%, Sn 12.5%
  • 17. According to woods metal composition and to periodic table of elements, Cd is a symbol for what elements?
A) Cadmium
B) Cathon Dioxide
C) Cadium
D) Cudisim
  • 18. Variety of solder with melting post of 60 C to 70C
A) Negocoll
B) Alloy
C) Woods metal
D) Celerity
  • 19. Adding ½ teaspoonful of salt to plaster of paris result to what effect
A) Retarding
B) Accelerating
C) Hardening
D) Hustening
  • 20. An tool impression and tire impression, what kind of casting material is best for it?
A) Woods metal
B) Plaster of Paris
C) Plastic material
D) Negocoll
  • 21. It is rubbing gelatinous consisting material, consisting of colloidal magnesium soap.
A) Plastic material
B) Celerit
C) Negocoll
D) Plaster of Paris
  • 22. Which one is not correct in the following statement.
A) Imprint is a weak mark made by gravity that stays on the surface.
B) It is hard to identify since one mark overlaps the other
C) Any material which can be changed from plastic or liquid state to the solid condition is called casting
D) Examination of tool impression is done by comparative examination the purpose of which is to determine or to show that the tool made the impression in question.
  • 23. Impression of a single blow of a hammer is an example of
A) Friction marks
B) Tool marks
C) Compression marks
D) Freckles marks.
  • 24. ______han also presence of trace elements which may be sufficient to establish or negate the fact of a common source for two samples of glass.
A) solid
B) doxide
C) Glass
D) Gas
  • 25. ________ a force to produces more spiral patterns
A) Dynamite force
B) Dynamite break
C) Dynamic force
D) Dynamic break
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