case /data -based (4 Marks)

Question 14 Marks

Richter scale measures the strength of earthquakes.

Richter scale measurement of the earthquake	Example of damages due to the earthquake
$3.0 – 3.9$	No damages but some vibrations felt
$4.0 – 4.9$	Cracks in windows, some unstable objects fall
$5.0 – 5.9$	Building walls may collapse, movement of furniture
$6.0 – 6.9$	Building roofs may collapse, loss of few lives
$7.0 – 7.9$	Cracks on ground, underground pipes broken, loss of many lives

$9.$ The damages from an earthquake are listed below.
● $2$ people died
● $5$ building roofs collapsed
● $12$ building walls collapsed
What could be the likely reading on the Richter scale for the earthquake$?$
$A. 4.8$
$B. 5.4$
$C. 6.5$
$D. 7.3$
$10.$ Which of these statements is trueabout earthquakes$?$
$A.$ Earthquakes can cause soil erosion
$B.$ Most of the earthquakes occur in mountain regions
$C.$ The location and duration of earthquakes can be predicted
$D.$ Earthquakes are caused by the movement of underground plates

Answer

$9. C. 6.5$
$10. D.$ Earthquakes are caused by the movement of underground plates

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Question 24 Marks

Earthquakes produce seismic waves that reach the Earth’s surface.
A seismograph is an instrument that records the seismic waves.
The strength of the earthquake is calculated from the graph recorded.

$8.$ Which of these graphs shows the strongest earthquake?

Answer

$8. B.$ Image

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Question 34 Marks

The diagram shows the focus of an earthquake
Focus is the point inside the Earth’s crust where the earthquake originates.
$1, 2, 3$ and $4$ are four locations on the Earth’s surface.

$6.$ In which location will the effect of the earthquake be maximum$?$
$A.$ Location $1$
$B.$ Location $2$
$C.$ Location $3$
$D.$ Location $4$
$7.$ Raju was in his garden when an earthquake hit the place.
What should Raju do to remain safe$?$
$A.$ Move to an open space
$B.$ Run away from the place
$C.$ Take shelter under a staircase
$D.$ Take shelter under a large tree

Answer

$6. B.$ Location $2$
$7. A.$ Move to an open space

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Question 44 Marks

Amit was travelling in a car when he saw lightning at some distance.
He heard a loud thunder after a few seconds.
$3.$ What should Amit do immediately to remain safe$?$
$A.$ Increase the speed of the car
$B.$ Stop the car and remain seated inside
$C.$ Stop the car and take shelter inside a building
$D.$ Turn the car and travel in the opposite direction
$4.$ Which of these conditions results in lightning?
$A.$ Negative and positive charges meeting
$B.$ The number of negative charges increasing
$C.$ The number of positive charges increasing
$D.$ Negative and positive charges moving away from each other
$5. $ A lightning conductor protects a building from lightning.
What is a lightning conductor made of$?$
$A.$ Glass
$B.$ Metal
$C.$ Wood
$D.$ Plastic

Answer

$3. C.$ Stop the car and take shelter inside a building
$4. A.$ Negative and positive charges meeting
$5. B.$ Metal

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Question 54 Marks

Ryan ran two combs through his hair.
He hung one comb from a stand using a thread.
Ryan brought the other comb close to the irst comb.
The picture below shows the result.

$1.$ Why did the comb move away from the other$?$
$2.$ Ryan repeats the activity using a pair of glass rods in place of the combs.
What would be the result$?$
$A.$ The hanging rod will move away
$B.$ The hanging rod will come closer
$C. $ The hanging rod will show no change
$D. $ The hanging rod will start spinning

Answer

$1.$ Mentions that the combs are likely charged.
$2. A.$ The hanging rod will move away

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Science case /data -based (4 Marks)

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