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CBSE Questions for Class 8 Physics Some Natural Phenomena Quiz 4 - MCQExams.com
CBSE
Class 8 Physics
Some Natural Phenomena
Quiz 4
_________ and _________ towns of North Kashmir suffered from a major earthquake.
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Uri, Tangdhar
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Ladakh, Uri
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Tangdhar, Ladakh
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Bhuj, Kachchh
Explanation
Uri and Tangdhar were the two towns of North Kashmir to have faced major earthquake with huge loss of lives and properties in 2005.
On $$26^{th} January, 2001$$, a major earthquake occured in _____ district of Gujarat.
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Uri
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Tangdhar
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Bhuj
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Kachchh
Explanation
On 26th January, 2001, an earthquake occurred in Bhuj district of Gujarat at a very high frequency on Richter scale.
When did a major Tsunami occur in the Indian ocean?
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On $$26^{th}$$ December, $$2004$$.
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On $$26^{th}$$ July, $$2004$$.
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On $$26^{th}$$ December, $$2001$$.
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On $$26^{th}$$ July, $$2001$$.
Explanation
A sudden disturbance under the Indian ocean led to Tsunami through the coastal areas of India on 26th December, 2004.
Fill in the blank:
A sudden shaking or trembling of the Earth, caused by a disturbance deep inside the Earth's crust, is known as ________.
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tsunami
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flood
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earthquake
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landslides
Explanation
An earthquake is a sudden shaking or trembling of the Earth which lasts for a very short time.
The natural phenomenon which we are not yet able to predict accurately is:
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Earthquake
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Flood
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Volcanic eruption
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Thunderstorm
Explanation
After knowing the causes of the earthquake, it is still not possible to predict when and where the next earthquake may occur.
The Earth's crust is fragmented and each fragment is known as:
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a spot
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a plate
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a valley
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none of the above
Explanation
The Earth's crust is not a huge single piece rather it is in many pieces or fragments. The fragments are called plates.
It is safer to use mobile and cordless phone during lightning because?
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They are wireless
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Less chances of getting in contact with lightning
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Both a & b
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None of the above
Explanation
Lightning can travels through the wires or cords of telephones giving an electric shock to you but use of mobile and cordless phones are safe.
Fill in the blank:
Most destructive earthquakes have magnitudes _______ on the Richter scale.
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$$4$$
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$$7$$
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less than $$7$$
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higher than $$7$$
Explanation
An earthquake of magnitude 7 is found to be destructive. And, obviously, most destructive earthquakes are of magnitude higher than 7 on the Richter scale.
The Earth's crust plates moves brushing past each other or collide. It causes:
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Landslides
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Volcanic eruption
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Earthquake
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None of these
Explanation
Any disturbance deep inside the Earth's crust leads to earthquake.
The plates or the fragments of the Earth's crust are also known as:
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Crust plates
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Surface plates
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Tectonic plates
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None of the above
Explanation
Earth's crust is fragmented into pieces which are called plates. These plates are also known as tectonic plates.
Fill in the blank:
Earth's plates are in _______ motion.
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circular
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vibrational
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rotational
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continual
Explanation
Earth's plates or tectonic plates are always in motion. These plates are floating above magma and are continuously moving and sometimes they collide with each other which cause earthquakes.
The boundaries of the plates, called weak zones, are also known as:
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danger zones
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seismic zones
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colliding zones
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none of the above
Explanation
The weak zones are also known as seismic zones. These are zones where earthquake are most likely to occur.
The inner most part or the centre of the Earth is known as ________.
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outer core
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inner core
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mantle
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crust
Explanation
Earth consist of core, mantle and crust.
Core is the centre of the Earth. Core, again, consists of inner core and outer core. Inner core is inner most part, or, the centre of the Earth.
Weak zones of plates are also known as:
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seismic zones
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fault zones
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danger zones
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both A and B
Explanation
The boundaries of the plates are the weak zones where earthquakes are more likely to occur. These are also known as seismic zones and fault zones.
The layer below the crust is called _______.
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Mantle
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Plate
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Outer core
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Inner core
Explanation
A mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density.
The most tremor-threatened areas in India are Kashmir, _______ and ________.
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Western, Eastern Himalayas
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Northern, Western Himalayas
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Eastern, Central Himalayas
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Western, Central Himalayas
Explanation
In India, Kashmir, Western and Central Himalayas are some places that fall along or near the fault zone. So, earthquakes are most likely to occur in those places.
Earthquakes are caused mostly due to:
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Landslide
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Flood
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Tsunami
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Movement of Earth's plates
Explanation
Most earthquakes are caused by the movement of the earth’s plates. When plates brush past or collide at the edges, an earthquake occurs.
Fill in the blank:
A weak earthquake has a magnitude _________ on a Richter scale.
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between 4 and 7
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between 2 and 4
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equal to 7
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more than 7
Is lightning static electricity?
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Yes
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No
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Sometimes
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None of the above
Explanation
Lightning is caused by a buildup of static electricity inside a storm cloud. Moving around inside the cloud are tiny water molecules . These molecules are colliding and bumping into each other—creating a static electric charge.Which results in lightning .
An earthquake of magnitude $$7$$ or more in Richter scale is considered to be___________.
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Strong
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Weak
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Medium
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None of the above
Explanation
Richter scaler is not linear, an increase of $$2$$ in magnitude means $$100$$ times more destructive energy. Therefore, an earthquake of magnitude more than $$7$$ is most destructive.
Which of the following cannot be charged by rubbing or friction?
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A plastic scale
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A copper rod
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An inflated balloon
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A woollen cloth
Explanation
Copper is a good conductor. So, charges flow very easily through the surface of copper. If a copper is rubbed with some material, the charge generated, instead of staying on the copper rod surface, flows throw it and reaches the Earth by conducting through our body. So, a copper rod can not be charged by rubbing or friction.
Which scale is used to measure the magnitude of earthquake?
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Kelvin
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Parcal
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Celsius
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Richter
Explanation
Richter scale is used to measure the magnitude of the earthquake.
Oppositely charged clouds, coming closer to each other, cause:
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induction
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conduction
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lightning
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none of the above
Explanation
Lightning is sudden electrostatic discharge between an electric charged region of a cloud or between two clouds.When oppositely charged clouds comes near to each other,charge gets accumulated in large numbers and air present no longer resists their flow.Negative and positive charges meets producing streaks of bright light called lightning.
Seismograph is a instrument used to:
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Record lightning
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Record strength of wind
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Record temperature
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Record vibrations of earthquakes
Explanation
The tremors produce waves on the surface of the earth. These are called seismic waves. The waves are recorded by an instrument called a seismograph.
How is lightning conductor installed during construction of building?
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By keeping one end of the rod open to the air and another end of the rod buried deep in the ground.
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By keeping one end of the rod closed and the other end is buried deep in the ground.
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By keeping one end of the rod open to the air and the other end just touching the ground.
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None of the above
Explanation
During the construction of a building, a lightning conductor is installed. One end of the conductor is taller than the walls of the building making taller target for lightning and the other end of conductor is buried deep in the ground so that charges gets discharged to the earth without any damage to building.
Storms, cyclones, earthquake, lightning etc. are ................ natural phenomena:
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constructive
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destructive
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simple
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complex
Explanation
Storms, cyclones, earthquakes and lightning are termed as natural calamities. These causes lot of damages to the properties and enviroments. Hence, they are destructive in nature.
Franklin showed that _______ and the spark from our clothes during winters are the same phenomena.
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Thunder-storm
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Earthquake
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Lightning
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Rain
Explanation
Lightning is caused by
the accumulation of charges in the
clouds.
In
$$1752$$ Benjamin Franklin, an American
scientist, showed that lightning and the
spark from your clothes are essentially
the same phenomena.
Can the lightning rods be made of any material?
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Yes
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No, it can only be made of metals.
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No, it can be made with any type of bodies with neutral charge
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None of these
Explanation
It should be of a metallic object so that it can conduct the charge. Any material won't be able to conduct charge. For example, aluminium rods are perfect.
_______ is nature's most powerful display of static electricity.
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Current electricity
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Lightning
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Conduction
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Induction
Explanation
Lightning is a natural phenomenon, which occurs when two clouds strike with each other and produce huge amount of electricity.
Hence lightning is
nature's most powerful display of static electricity.
If we rub our dry forearm with a silk cloth, the hairs on the forearm will stand straight. This is because:
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of the attraction force between the hairs and the cloth.
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of the charge acquired to the forearm due to rubbing.
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of the magnetic field created due to rubbing.
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none of the above.
Explanation
When the forearm is rubbed with a cloth of silk, the dry forearm acquires positive charge. So, all the hairs there acquire same positive charge and repel each other. Thus the hairs stand straight after rubbing.
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