This set of Engineering Geology Multiple Choice Questions & Answers (MCQs) focuses on “Physical Properties – 05”.
1. The density range lies between 2.5 and 4.5 g/cc for __________
a) Metallic minerals
b) Non-metallic minerals
c) Metalloid minerals
d) Ore minerals
View Answer
Explanation: The non-metallic minerals have low values of density, ranging between 2.5 and 4.5 g/cc, whereas metallic minerals and ores have densities as high as 20 g/cc.
2. Atoms of greater atomic radii show __________
a) Less density
b) Greater density
c) No difference
d) Doesn’t depend on atomic radii
View Answer
Explanation: Minerals with atoms of greater atomic radii show less density values compared with those made of atoms of smaller atomic radii.
3. Form in which neither a crystal face nor a cleavage is seen is __________
a) Crystalline
b) Crystallized
c) Amorphous
d) Crystalline and crystallized
View Answer
Explanation: Amorphous form is a form in which neither a crystal face nor a cleavage is seen. There is no evidence of orderly arrangement of atoms in this form.
4. The minerals which develop electric charge upon heating are called __________
a) Pyro-electric minerals
b) Piezo-electric minerals
c) Paramagnetic minerals
d) Diamagnetic minerals
View Answer
Explanation: In some minerals an electric charge may be developed by heating. These are called pyroelectric minerals. Examples: Tourmaline, boracite, quartz etc.
5. The Phenomenon where electric charge develops due to application of pressure is __________
a) Pyro-electric minerals
b) Piezo-electric minerals
c) Paramagnetic minerals
d) Diamagnetic minerals
View Answer
Explanation: In some minerals, an electric charge is developed by applying pressure. This group is termed as piezo-electric. Examples: Tourmaline and quartz.
6. How many minerals are present in the scale of fusibility given by Von Kobell?
a) 3
b) 4
c) 5
d) 6
View Answer
Explanation: A scale of fusibility has been suggested by Von Kobell. It consists of six minerals arranged according to temperature of fusion. Stibnite, Natrolite, Alamandine, Actinolite, Orthoclase and Bronzite.
7. Specific gravity of mineral changes with temperature.
a) True
b) False
View Answer
Explanation: Since temperature and pressure are both known to change volume of substance, it follows that density will also show a change when a mineral is subjected to elevated temperature or high pressures.
8. Which of the following minerals can scratch Topaz?
a) Corundum
b) Apatite
c) Gypsum
d) Quartz
View Answer
Explanation: Only corundum can scratch topaz because, all the other minerals given have lesser Mohs number compared to topaz, whereas topaz as hardness number 8 and corundum has 9.
9. Streak colour and colour of the mineral are always same.
a) True
b) False
View Answer
Explanation: It follows that the colour of a mineral may not be the same as its streak. For identification, streak is relied upon more than the colour of the mineral.
10. Which of the following mineral shows phosphorescence?
a) Orthoclase
b) Calcite
c) Quartz
d) Galena
View Answer
Explanation: Phosphorescence is similar to fluorescence in essential character but in this case light is emitted by mineral not during the act of exposure but after the substance is transferred rapidly to a dark place. Fluorite, quartz, willemite and diamond show this phenomenon.
11. Quartz shows which lustre?
a) Metallic
b) Vitreous
c) Pearly
d) Resinous
View Answer
Explanation: Vitreous lustre is a type of lustre which is typical of glass, ice etc. Example: Quartz.
12. Which among the following shows silky lustre?
a) Quartz
b) Galena
c) Gypsum
d) Diamond
View Answer
Explanation: Silky lustre is like the shine of pure silk. Example: Gypsum.
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