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CBSE Questions for Class 7 Geography Our Changing Earth Quiz 1 - MCQExams.com
CBSE
Class 7 Geography
Our Changing Earth
Quiz 1
A Seismograph is an instrument used to detect
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Volcanoes
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Earthquakes
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Cyclones
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Landladies
Epicentre is concerned with
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Earthquake
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Volcano
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Cyclone
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Land sliding
Explanation
Correct answer-A
The point inside the earth's crust where the earthquake originates is called as the focus of earthquake. The point on the surface of the earth above the focus is called as epicentre.
Volcanoes and Earthquakes are caused by :
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plate convection
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plate contraction
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plate tectonics
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plate boundary
Explanation
When the plate separate the magma comes out of surface resulting in volcano and when they strike with each other it result in earthquake. They are the result of plate tectonics.
Natural processes change the surface of Earth. Some changes occur rapidly and some occur slowly. Which of the following would cause the slowest change in Earth's surface?
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Wind
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Landslides
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Volcanoes
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Earthquakes
By
which of the following, magnitude of earthquake is measured?
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Electroscope
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Richter scale
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Seismograph
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Coloumb
Explanation
The Richter scale measures the magnitude of an earthquake (how powerful it is). It is measured using a machine called a seismometer which produces a seismograph. A Richter scale is normally numbered 1-10, though there is no upper limit.
The shaking of earth is called
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Tsunami
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Volcano
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Earthquake
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None of these
Niagara Falls are in
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Australia
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U.K.
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South Africa
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U.S.A
Explanation
Correct answer-D
Niagara Falls is in New york, USA.
Erosion is the process of ____________________.
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Disintegration of rocks
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Decomposition of rocks
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Cutting and removal of land by running water, wind and ice
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Deposition of material
Explanation
Erosion
is the geological
process
in which earthen materials are worn away and transported by natural forces such as wind or water. A similar
process
, weathering, breaks down or dissolves rock, but does not involve movement. ... Most
erosion
is performed by liquid water, wind, or ice (usually in the
form
of a glacier)
Choose the correct statement(s)?
The movement of interior plates of earth causes change in surface of earth.
Sea waves comes under exogenic force.
Sudden movement of interior of earth causes earthquakes.
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only 1
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1 and 2
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1 and 3
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All are true
Explanation
Correct answer- D
The land-forms of the earth are a result of the endogenic and exogenic forces. Endogenic forces are those which occur inside the earths surface whereas exogenic forces are those which occur at the outer surface of the earth.
Statement 1: is correct as movement of interior plates causes earthquake and other brings about changes in the way the tectonic plates are arranged which in turn brings about changes in the earths surface.
statement 2: is correct as sea waves are outer surface phenomenon which is exogenic.
Statement 3: is correct as sudden movement of interior of earth releases energy which causes vibrations called earthquake.
The depositional feature of a glacier is __________.
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Beach
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Moraine
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Flood plain
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None of these
Explanation
Moraines are ridge-like depositional features of glacial tills. Moraines consist of rock materials of heterogeneous shapes and size.
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Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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Assertion is correct but Reason is incorrect
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Assertion is incorrect but Reason is correct
Explanation
Both the statements are correct but the reason that volcanoes erupt water vapours and dust particles in the atmosphere is not correct explanation for an earthquake.
Which is not an erosional feature of sea waves?
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Cliff
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Beach
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Sea cave
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None of these
Explanation
Sea beaches are not the erosional feature of sea waves. They are formed due to the depositional activities of sea waves.
What are meanders?
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Zigzag flow of river
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Circular flow of river
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Straight flow of river
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None of these
Mushroom rocks are found in ____________.
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River valleys
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Deserts
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Glaciers
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Flood plain
Explanation
Mushroom rocks are found in deserts. They are the erosional landforms of the arid or desert region. The erosive power of wind becomes very high at a certain height from the ground level. The resistant rocks take the shape of mushroom having large top and a small neck. The formation is called Mushroom rock.
Which landforms are formed due to the deposition of sediments carried by the river?
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Flood levees
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Flood plains
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Deltas
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All of above
Explanation
Landforms like flood levees, flood plains and deltas are formed because of the depositional works of the river.
Forces which act in the interior of the earth are called as _______________.
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Exogenic forces
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Endogenic forces
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Eurogenic forces
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None of these
Explanation
The horizontal and vertical movements caused by the forces coming from interior of the earth are known as endogenic forces. The origin of the endogenic force is caused by the contraction and expansion of rocks due to variation in thermal conditions and temperature inside the earth.
Ox bow lakes are found in _________.
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Glaciers
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River valleys
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Deserts
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None of these
Explanation
Oxbow lakes are found in river valleys.
An oxbow is a crescent-shaped lake lying alongside a winding river. The oxbow lake is created over time as erosion and deposition of soil change the river's course.
Match column I with column II and select the correct answer using the code given below the columns:
Column I
(Land forms)
Column II
(Exogenic forces)
(A) Flood plain
(i) Sea waves
(B) Sea cliff
(ii) Glaciers
(C) Moraines
(iii) Wind
(D) Sand dunes
(iv) River
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(A) -- iv, (B) - iii, (C) - ii, (D) - i
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(A) - iii, (B) - ii, (C) - i, (D) - iv
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(A) - iv, (B) - i, (C) - ii, (D) - iii
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(A) - iii, (B) - iv, (C) - i, (D) -ii
Explanation
Correct answer- C
(A) Flood Plains are formed by the deposits brought down by the river along its course.
(B) Sea cliff is near vertical rock exposure formed due to coastal erosion
(C) Moraines are accumulation of dirt and rocks that have fallen onto the glacier surface or have been pushed by the glacier as it moves
(D) Sand dunes are depositional landform formed by the deposits of wind mainly in desert areas.
The main cause of earthquakes is:
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Sudden cooling and contraction of the earth surface
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Coming into activity of some dormant volcanoes
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Due to internal heat, sometimes water changes into steam and expands
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All of the above
The highest waterfall of the world is
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Niagara Falls
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Boyomar Falls
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Angel Falls
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Khone Falls
Explanation
Angel Falls in Venezuela is the highest waterfall in the world.
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