Earth and Its Structure NDA Questions

NDA Physical Geography

Earth and Its Structure MCQ Questions


1.
What is the radius of the Earth?
A.
6,371 km
B.
5,500 km
C.
7,000 km
D.
6,000 km
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ANSWER :
A. 6,371 km
2.
Which is the deepest drill ever made on Earth's surface?
A.
Bertha Rogers Well, USA (~10 km)
B.
Kola Superdeep Borehole, Russia (~12 km)
C.
JOIDES Resolution, Atlantic (~6 km)
D.
KTB Borehole, Germany (~9 km)
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ANSWER :
B. Kola Superdeep Borehole, Russia (~12 km)
3.
Gold mines in South Africa are approximately how deep?
A.
8–10 km
B.
5–6 km
C.
1–2 km
D.
3–4 km
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ANSWER :
D. 3–4 km
4.
Which of the following is a DIRECT source of information about Earth's interior?
A.
Gravity anomaly readings
B.
Volcanic eruptions bringing magma to the surface
C.
Magnetic field surveys
D.
Seismic wave behaviour
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ANSWER :
B. Volcanic eruptions bringing magma to the surface
5.
Which of the following is an INDIRECT source of information about Earth's interior?
A.
Volcanic lava analysis
B.
Deep ocean drilling samples
C.
Surface rock samples from mines
D.
Seismic wave analysis
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ANSWER :
D. Seismic wave analysis
6.
What is 'gravity anomaly'?
A.
Increase in gravity near the poles
B.
Difference between expected and observed gravity values at a location
C.
Gravity at the centre of Earth
D.
Decrease in gravity at the equator
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ANSWER :
B. Difference between expected and observed gravity values at a location