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Question 1.
How do we measure the magnitude of earthquakes?
(a) Richter Scale
(b) Mercalli Scale
(c) Measuring Scale
(d) Seismograph.
Answer:(a) Richter Scale
Question 2
How do we measure the intensity of earthquakes?
(a) Richter Scale
(b) Mercalli Scale
(c) Measuring Scale
(d) Seismograph.
Answer:(b) Mercalli Scale
Question 3.
Fast moving waves which reach the earth earliest are called:
(a) Alpha Waves
(b) S-Waves
(c) P-Waves
(d) Beta Waves.
Answer:(c) P-Waves
Question 4.
The upper portion of mantle is called:
(a) Asthenosphere
(b) Crust
(c) Lithosphere
(d) Fossil Sphere.
Answer:(a) Asthenosphere
Question 5.
What is the approximate depth of mantle?
(a) 2400 km
(b) 2900 km
(c) 3200 km
(d) 3500 km.
Answer:(b) 2900 km
Question 6.
Core is made of which metals?
(a) Iron and Magnesium
(b) Iron and Silicon
(c) Nickel and Iron
(d) Nickel and Magnesium.
Answer:(d) Nickel and Magnesium.
Question 7.
What is the density of the rocks between the adjoining line on mantle and core?
(а) 3-4 gm per sq cm
(b) 5 gm per sq cm
(c) 4-5 gm per sq cm
(d) 6 gm per sq cm.
Answer:(b) 5 gm per sq cm
Question 8.
What is the thickness of the crust?
(a) 10 km to 200 km
(b) 50 km to 300 km
(c) 30 km to 400 km
(d) 100 km to 200 km.
Answer:(a) 10 km to 200 km
Question 9.
What is the density of the rocks of mantle?
(a) 3-4 gm per sq cm
(b) 5 gm per sq cm
(c) 4-5 gm per sq cm
(d) 6 gm per sq cm.
Answer:(a) 3-4 gm per sq cm
Question 10.
Crust and upper portion of mantle taken together is called:
(a) Asthenosphere
(b) Magma
(c) Lithosphere
(d) Core.
Answer:(c) Lithosphere
Question 11.
What is the mean thickness of oceanic crust?
(a) 5 km
(b) 30 km
(c) 10 km
(d) 70 km.
Answer:(a) 5 km
Question 12.
What is the mean thickness of continental crust?
(a) 5 km
(b) 30 km
(c) 10 km
(d) 70 km.
Answer:(b) 30 km.
Question 13
Which one of the following earthquake waves is more destructive?
(a) P-waves
(b) S-waves
(c) Surface waves
(d) None of the above.
Answer:(a) P-waves
Question 14
Which one of the following is a direct source of information about the interior of the earth?
(а) Earthquake waves
(b) Volcanoes
(c) Gravitational force
(d) Earth magnetism.
Answer:(а) Earthquake waves
Question 15
Which type of volcanic eruptions have caused Deccan Trap formations?
(a) Shield
(b) Flood
(c) Composite
(d) Caldera.
Answer:(b) Flood
Question 16
Which one of the following describes the lithosphere?
(a) Upper and lower mantle
(b) Crust and upper mantle
(c) Crust and core
(d) Mantle and core.
PDF OF THESE QUESTIONS
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