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Interior of the Earth of the Earth Class 11 MCQs Questions with Answers
I. Choose the correct answer
Question 1.
What are constantly shaping the landscape?
(a) exogenic processes
(b) endogenic processes
(c) both of them
(d) none of them
Answer
Answer: (c) both of them.
Question 2.
What is the radius of earth?
(a) 6370 km
(b) 6360 km
(c) 6380 km
(d) 636 km
Answer
Answer: (a) 6370 km.
Question 3.
Which one is the direct source of providing information about the interior of the earth?
(a) Deep Ocean Drilling Project
(b) Volcanic eruptions
(c) Integrated Ocean Drilling Project
(d) all of them
Answer
Answer: (d) all of them.
Question 4.
Which one is the indirect source of providing information about the interior of the earth?
(a) volcanic eruption
(b) gravitational force
(c) drilling projects
(d) Ocean Integrated Drilling Project
Answer
Answer: (b) gravitational force.
Question 5.
The temperature and pressure increases through
(a) mining
(b) drilling
(c) volcanic
(d) gravitational
Answer
Answer: (a) mining.
Question 6.
The gravitation force (g) at different latitudes on the surface is
(a) same
(b) different
(c) decreases towards the poles
(d) increases towards the equator
Answer
Answer: (b) different.
Question 7.
Earthquake is
(a) shaking of the earth
(b) release of heat
(c) evolution of gases
(d) none of them
Answer
Answer: (a) shaking of the earth.
Question 8.
Name the point from which energy is released?
(a) core
(b) mantle
(c) focus
(d) body
Answer
Answer: (c) focus.
Question 9.
What is called the point on the surface?
(a) Hypocentre
(b) Focus
(c) Epicentre
(d) Body centre
Answer
Answer: (c) Epicentre.
Question 10.
Which instrument records the waves reaching the surface?
(a) Seismograph
(b) Richter scale
(c) Demograph
(d) none of these
Answer
Answer: (a) Seismograph.
Question 11.
Earthquake waves are of types
(a) two
(b) three
(c) five
(d) four
Answer
Answer: (a) two
Question 12.
How many types of Body waves are there?
(a) two
(b) five
(c) four
(d) six
Answer
Answer: (a) two.
Question 13.
Which wave moves faster to arrive at the surface?
(a) ‘P’
(b) ‘S’
(c) ‘P’ and ‘S’
(d) none of these
Answer
Answer: (a) ‘P’.
Question 14.
Which wave moves slowly to arrive at the surface?
(a) P
(b) S
(c) surface waves
(d) body waves
Answer
Answer: (b) S.
Question 15.
In w hat form the seismograph gives the record of the waves?
(a) frequency
(b) amplitude
(c) both of them
(d) none of them
Answer
Answer: (c) both of them.
Question 16.
Which waves are most destructive?
(a) body waves
(b) surface waves
(c) P-waves
(d) S-waves
Answer
Answer: (b) surface waves.
Question 17.
Surface waves are classified into
(a) Love
(b) Rayleigh
(c) both
(d) none of these
Answer
Answer: (c) both
Question 18.
What type of earthquake is generated due to sliding of rocks?
(a) Reservoir induced
(b) Tectonic
(c) Explosion
(d) Collapse
Answer
Answer: (b) Tectonic.
Question 19.
The tremors which occur due to the explosion of chemical or nuclear devices are called
(a) Collapse
(b) Explosion
(c) Volcanic
(d) Tectonic
Answer
Answer: (b) Explosion.
Question 20.
The magnitude of an earthquake is measured on
(a) Seismograph
(b) Richter scale
(c) none of these
(d) both of these
Answer
Answer: (b) Richter scale.
Question 21.
The magnitude is expressed in absolute number
(a) 0 to 10
(b) 1 to 12
(c) 0 to 12
(d) 1 to 10
Answer
Answer: (a) 0 to 10.
Question 22.
What generates the tsunami waves?
(a) earthquake
(b) tremors
(c) volcanic eruption
(d) meteor
Answer
Answer: (b) tremors.
Question 23.
What is the velocity of ‘P’ waves?
(a) 5-6 km/s
(b) 10-20 km/s
(c) 1-3 km/s
(d) 8-10 km/s
Answer
Answer: (a) 5-6 km/s.
Question 24.
The outermost part of the solid earth is known as
(a) core
(b) crust
(c) mantle
(d) none of these
Answer
Answer: (b) crust.
Question 25.
What is the mean density of material in oceanic crust?
(a) 3 g/cm³
(b) 2.7 g/cm³
(c) 1 g/cm³
(d) 3.8 g/cm³
Answer
Answer: (b) 2.7 g/cm³
Question 26.
Which material reaches the ground during volcanic eruptions?
(a) gases
(b) sulphur compounds
(c) nitrogen compounds
(d) all of them
Answer
Answer: (d) all of them.
II. Fill up the blanks with suitable words
Question 1.
…………. from South Africa are as deep as 3-4 km.
Answer
Answer: Gold mines
Question 2.
………….. are the solid bodies developed out of the materials.
Answer
Answer: Meteors
Question 3.
The other indirect sources include ………………. and ……………
Answer
Answer: gravitation, magnetic field, seismic activity
Question 4.
The point where the energy is released is called ………….
Answer
Answer: focus
Question 5.
………….. are generated due to the release of energy at the focus.
Answer
Answer: Body waves
Question 6.
……………. are also called primary waves.
Answer
Answer: ‘P’ waves
Question 7.
…………… gives the record of the waves in the form of frequency and amplitude of incoming waves.
Answer
Answer: Seismograph
Question 8.
The region where earthquake waves are not recorded is known as ……………
Answer
Answer: shadow zone
Question 9.
A special tectonic earthquake is recognised as …………….
Answer
Answer: volcanic earthquake
Question 10.
Oceanic crust is …………… as compared to the ……………. crust.
Answer
Answer: thinner, continental
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