8th Standard CBSE Syllabus & Materials
8th Standard CBSE
CBSE 8th Social Science Theme D - Factors of Production - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Social Science Theme C - Universal Franchise and India's Electoral System - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Social Science Theme B - The Rise of the Marathas - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Social Science Theme B - Reshaping India's Political Map - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Social Science Theme A - Natural Resources and Their Use - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Science Keeping Time with Skies - New Model Questions Papers Study Material - QB365 Set A
Published on: 09/09/2019
Some Natural Phenomena
Download CBSE Class 8th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 8th Standard CBSE Science
Questions + Answers key
Take MCQ Science Test
1.
Explain how do the buildings can be designed and constructed in seismic zones.
2.
You might have observed on a dry day that when you touch the screen of a television or computer monitor (with picture tube), you get a slight shock. Why does it happen?
3.
Explain how does lightning conductor protect a building from getting struck by lightning.
4.
Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
5.
Boojho: My grandmother told me that the earth is balanced on the horn of a bull and when the bull shifts it to the other horn, an earthquake takes place. How could it be true?
6.
What are seismic or fault zones?
7.
What do you mean by earthing?
8.
In order to protect the building from lightning, briefly mention the place, where is the lightning rod should be attached.
9.
Explain the importance of earthing.
10.
If the metal clip used in the electroscope is replaced by an ebonite rod and a charged body is brought in contact with it, will there be any effect on the aluminium strips? Explain.
11.
Priya went to the school with umbrella on rainy season. One day, while returning from the school the rain started on the way. Priya opened her umbrella and saved himself from rainwater. After some time, she observed some lightning sparks in the sky. Sudden, she folded her umbrella and went to a shelter under a closed building.
(a) State the cause of lightning.
(b) Priya folded her umbrella. Explain why.
(c) Mention the method opted by Priya here.
12.
Major earthquakes are less likely to occur in
North-East India
Rajasthan
Rann of Kutch
Orissa
13.
Where is the lightning rod attached to protect the building from lightning?
On the top of building
In the middle of building
On the bottom of building
All of the above
14.
The earth's plate responsible for causing earthquake is
the crust of the earth
the mantle of the earth
the inner core of the earth
the outer core of the earth
15.
The movement of the earth's plates causes
cyclones
lightning
earthquake
thunderstorms
16.
An electroscope is a device which is used to find if an object is
charged
magnetic
free of cracks
hot
17.
Earthquakes are caused due to movements of _____________.
18.
It is ____________ possible to predict the occurrence of an _____________.
19.
Seismograph is an instrument that records _____________.
20.
Earthquake is caused by _____________ a deep inside the earth's crust.
21.
Nitrogen fixation occurs during ___________.
22.
Mantle is the outermost layer of the earth.
23.
We should build heavy houses in a danger zone.
24.
Bathing outdoors should be avoided during thunderstorm.
25.
The process of electric discharge cannot occur between clouds and the earth.
1.
Since, in seismic zones, all the houses and buildings should be designed and constructed in such a way, so that they can withstand major earthquake tremors.
2.
It happens because the television screen or computer monitor are charged and have static charges and when we touch them with our hands which are uncharged, the charges attract our hands and transfer through our hands and we get a small shock.
3.
Lightning conductor is connected with a wire which is finally connected to a copper plate and copper plate is grounded. So, when lightning occurs, all the charge is transferred through this conductor and reach to the ground and building gets no harm.
4.
The crackling sound is heard while taking off a sweater during winters is due to rubbing of two objects, i.e. body and the wool. The rubbing of the static charges produces lightning or the spark in our clothes that produces a crackling sound. The electric charges produced by rubbing are called static charges.
5.
No, we know that the earthquakes are caused by the disturbance deep down inside the uppermost layer of the earth called the crust.
6.
The weak zones where earthquakes are more likely to occur are called seismic or fault zones.
7.
The process of transferring of charge from a charged object to the earth is called earthing.
8.
The lightning rod should be attached on the top of the building.
9.
In order to protect us from electrical shock due to leakage of electric current, the earthing is provided in the building.
10.
Since ebonite rod acquires charge when rubbed. So, the Charge transfer will be either too less or there will be no transfer of charges, so the strips of aluminium will not be wider and we are not able to predict the object whether it is charged or not.
11.
(a) In the clouds, accumulation of charges causes, lightning.
(b) As we know that the top end of stretched umbrella is a metal part. Since, the metal is a good conductor of electricity, so if lightning strikes to the ground, then it can take the path towards umbrella. Therefore, to avoid herself from danger, Priya folded the umbrella and went to a closed building.
(c) The immediate response and the scientific method is opted by Priya here.
12.
(d)
Orissa
13.
(a)
On the top of building
14.
(d)
the outer core of the earth
15.
(c)
earthquake
16.
(a)
charged
17.
( )
earth's plate
18.
( )
not, earthquake
19.
( )
seismic waves
20.
( )
disturbance
21.
( )
lightning
22.
(b)
23.
(b)
24.
(a)
25.
(b)
8th Standard CBSE Syllabus & Materials
8th Standard CBSE
CBSE 8th Science Particulate Nature of Matter - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Science Pressure, Winds, Stroms and Cyclones - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Mathematics Quadrilaterals - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Mathematics A story of Numbers - New Model Questions Papers Study Material - QB365 Set A
CBSE 8th Standard CBSE Subjects
CBSE Standards
