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Anukruti posted an MCQ

August 06, 2020 • 03:31 am

30 points

IIT JAM
Geology (GG)

Which one of these is best incompetent rock?

Choose Your Answer:

A Shale

B Limestone

C Sandstone

D Gritstone

2 Attempts

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3 Comments
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Rahul kumar Best Answer

Shale is most incompetent among all given options because shale rocks have fissility layers.
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since it has fissibility layers so it is less ductile or more ductile??
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Fissility makes the shale rocks weaker i.e. incompetent.
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thank u so much sir
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sir just explain once competency.does it mean rock ability to break?
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i got explanation from sajan sir in coment section that more the ductile ,more is the incompetency of the rock.wherease u said less ductile so it breaks
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what is right then ?
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Competency is just the strength of rock. A rock, which is very hard/stiff is more competent than a rock which can break easily. In general, incompetency is directly proportional to ductility of the rock.
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so shale has more ductility??right since it breaks easily
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Yes, shale is more ductile. One of my previous statement was contradictory, you can ignore that one.
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Sajan sarthak

shale
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Sajan sarthak

the more the ductile the more the incompetent
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shale rocks have fissiblity layers,weaker and less ductile.
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so more incompetent
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yaa shales have fissile layera but they are more ductile
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rahul sir commented they are less ductile
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he said they are less ductile as compared to others because it breaks rather than flowing
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no
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what is right then?
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