Telangana SCERT Class 8 Physical Science Chapter 10 Some Natural Phenomena Solution

Telangana SCERT Class 8 Physical Science Chapter 10 Solution – Some Natural Phenomena. Here in this post we provides Class 8 Physical Science Some Natural Phenomena Telangana State Board Solution. Telangana State Board English Class VIII Medium Students can download this Solution to Solve out Improve Your Learning Questions and Answers.

Telanagana State Board Class 8 Physical Science Chapter 10 Some Natural Phenomena Solution:

(1) Describe with the help of a diagram an instrument which can be used to detect a charged body.

Describe: Take an empty jam bottle, bigger size cardboard,

create a hole in it, that a metal paper clip could be inserted. Now open out paper clip. Insert two strips of aluminius foil on paper clip and set them as perpendicular.

The strips of aluminium foil receive the same charge from the charged refill through the paper clip. The strips carrying similar charges repel each other and here they move apart.

This device known as ectroscope. In this actilvity we can observe that electrical charge can be transferred from a charged object to another through a metal conductor.

A electroscope used to detect wheather a body is charged or not.

(2) Which places are not safe during a thunderstorm?

Ans. i) Travelling in an open place.

ii) Staying in multi storied building which do not have lightning conductors.

iii) Standing under tall tree in open fields or or in a garden / park.

iv) Speaking on landline telephone.

v) Standing near elctric poles or telephone poles.

(3) List three states in India where earthquakes are more likely to occur.

Ans. Guwahati – Assam

Kolkata – West Bengal

Patna – Bihar.

(4) Explain how do you determine the intensity of earthquake.

Ans. The power of a earthquake is expressed in terms of a magnitude on Richter scale.

So using richter scale we can determine the intensity of earthquake.

But a professional geologist would make a use of seismograph, which measures the value of earthquake, it is quite matches with the intensity of an earthquake.

(5) Suppose you are outside your home and an earthquake occurs. What precaution would you take to protect yourself.

Ans. In the event that an earthquake does strike, take the following steps to protect yourself –

Outside the home:

i) Find a clear spot.

ii) Away from buildings, trees and over head power lines.

iii) Drop to the ground.

iv) Take shed under bench.

v) Do not get inside a crowded place.

Application of concepts

Q1. Sometimes, a crackling sound is heard while taking off sweater during winter. Explain.

Ans. Sometimes a crackling sound is heard while taking of sweater during winter, because the sweater gets charged to rub with our body / the sweater gets charged because of rubbing with the body, So we get to hear a crackling sound.

Q2. Give two examples of your daily life about effects which are caused by transfer of charges.

Ans. Examples are-

i) When we rub our hair with the plastic comb and then the ‘comb’ bring near to some ‘small pieces of paper’. Then we can see that the ‘comb’ attract the ‘small piece of paper’. Here we can see the transfer of charges.

ii) If we rub a balloon with the woolen cloth and rub the refill with the polythene then the balloon attracts the refill.

Question 3: Inflate two balloons and rub both of them with a cloth first and then with different material. Will they attract each other in both cases?

Ans. Inflate two balloons and rub both of them with a cloth first and then with different material will they attract each other in both cases.

i) In first case when rub both balloons with cloth, they both get same charge which is present on cloth, and they will repel each other.

ii) In 2nd case they both are rubbed with different material, then both gets different charges; so they attract each other in this case.

Question 4: Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by a charged balloon?

Ans. We know that two charged bodies attract each other but when you bring charged body to uncharged body, then it attracts because of the uncharged body need to gets the charge from the charged body. So in that case a charged balloon is repelled by another charged balloon. And also an uncharged balloon is attracted by a charged balloon as they have different charges.

Question 5: How do you appreciate the efforts of scientists in developing an instrument to measure the intensity and detect the source of earthquake?

Ans. The efforts of scientist in developing as instrument to measure the intensity and source of earthquake is thoroughly appreciated.

By measuring intensity of a earthquake we can know about its strength and we get time to take measures to protect ourselves from the damage caused by these phenomena. For this discovering instrument we can describe that from which place it started and we can also get and idea about earthquakes.

Higher Order Thinking Questions

(1) The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella?

Explain.

Ans. No, carrying an umbrella will not be a good idea, it can be risky.

A thunderstorm can travel through the metallic rod. As we know umbrellas has metallic rod, so it can travel in this rods. and when a person holding this umbrella then she / he may recieve an electric shock.

So it is not sweetable to carry an umbrella during a thunderstrom.

(2) Is there any alternative method to find the intensity of earthquake?

Ans. There is another method of measuring the intensity of a using the moment magnitude scale which is based on the amount of displacement that occurred along a fault zone rather than the measurement of ground motion at a given point.

The moment magnitude measures energy released by the earthquake more accurately than the Richter scale.

(3) We know that the clouds have charges. Can we produce current through these charges?

Ans. Yes it is possible for us to produce current through these charges.

Clouds have charges. But they are very intensive, So we can’y control them.

But here some problem becaue we don’t have this type of technology to produce current through these charges.

(4) How do you appreciate the efforts of the scientists to develop a Lightning conductor to protect buildings from the effect of lightning.

Ans. We must appreciate the efforts of the scientists to develop a lightning conductor.

Lightning conductors is a device used to protect buildings from the effect of lightning. A metallic rod, taller than the building is installed in the walls of the building during its constraction. Then the lightning conductor arranged on top of the buildings. So when the lightning ready to falls on buildings the conductor can absorb the lightning and send it to the surface of the land. By this we can appreciate the effort of scientists.

Multiple Choice Questions

(1.) Which of the following cannot be charged easily by friction

a) a plastic scale b) a copper rod c) a wollen cloth d) piece of wood

Ans. b) a copper rod

(2.) When a glass rod is rubbed with a piece of silk cloth

a) Rod and the cloth acquire positive charge

b) Road becomes positively charged while the cloth has a negative charge

c) Rod and the cloth both acquire negative charge

d) Rod becomes negatively charged while the cloth has a positive charge

Ans. b) Road becomes positively charged while the cloth has a negative charge

(3.) The magnitude of destructive earthquakes on the Richter scale is greater than:

a) 3.0 b) 4.0 c) 7.0 d) 2.0

Ans. c) 7.0

(4.) The instrument is used to estimate the intensity of earth quake is

a) Sesimograph b) Sesimoscope

c) Gold leaf electroscope d) Lightning conductors

Ans. a) Sesimograph

(5.) It can protects buildings from the effects of lightning