Coal, when heated in the absence of air to a temperature above 600°C, from solid residue called
A. Cake
B. Coke
C. Tar
D. All of these
Answer: Option B
A. Cake
B. Coke
C. Tar
D. All of these
Answer: Option B
On the basis of which content the igneous rocks are classified as acid rocks and basic rocks?
A. Magnetite
B. Hematite
C. Bauxite
D. Silica
Origin of Solar System divided in two groups, which are
A. Evolutionary and catastrophic
B. Nebula and gaseous tidal hypo
C. Jeansand Jeffires
D. A and B both
A. Attrition
B. Deflation
C. Denudation
D. Mantle
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