ROCKS AND MOUNTAINS MCQS SET 09

ROCKS AND MOUNTAINS MCQS SET 09

1. Igneous rocks are said to be acidic when they contain high proportion of:
(a) iron
(b) magnesium
(c) silica
(d) aluminium
Ans: (c)

2. Batholiths and Laccoliths are formations of:
(a) sedimentary rocks
(b) igneous rocks
(c) metamorphic rocks
(d) polymetamorphosed rocks
Ans: (b)
 
3. A block of the earth's crust that has remained in position while the ground around it has subsides is known as :
(a) horst
(b) plain
(c) plateau
(d) young folded mountain
Ans: (a)
 
4. Consider the following statements:
1. Igneous rocks are classified into Extrusive and Intrusive rocks.
2. Sedimentary rocks are also called as Primary rocks
3. Marble is an example of Metamorphic rocks
4. Coal is a sedimentary rock
Which of the above statements is/are correct?
(a) 1 only
(b) 2 and 3
(c) 1, 3 and 4
(d) 2 and 4
Ans: (c)

5. India broke away from Australia and Antarctica and started moving north in the period of:
(a) Permian
(b) Triassic
(c) Jurassic
(d) Cretaceous
Ans: (d)
 
6. The well-defined zones of seismic activity in the world where the largest number of earthquakes originates is :
(a) Mediterranean Zone
(b) Circum Pacific Belt
(c) Mid oceanic Rift Valley Zone
(d) African Rift Valley Zone
Ans: (b)

7. Which one of the following types of volcanic eruptions is not usually explosive?
(a) Pelean
(b) Hawaiian
(c) Strombolian
(d) Vulcanian
Ans: (b)

8. Which of the following are true with regard to igneous rocks?
1. They are formed inside the earth, under great pressure
2. They do not occur in layer
3. They are mostly crystalline in nature
4. They contain fossils
(a) I, II and III
(b) II, III and IV
(c) II and III
(d) I and IV
Ans: (b)
 
9. Which of the following are true with respect to sedimentary rocks?
1. The rocks are deposited in layers
2. The particles of rocks are at times wholly of organic nature
3. The rocks are not crystalline
4. Their structure is determined by great pressure or heat
(a) I, II and III
(b) II and III
(c) I and IV
(d) I and II
Ans: (a)
 
10. Who gave the idea that originally there was only one continent called Pangea ?
(a) Wegener
(b) Marshall
(c) Darwin
(d) Ptolemy
Ans: (a)