We are providing here the detailed and precise solutions to all those NCERT questions. Here, we have provided some of the important questions in which the solutions of NCERT can benefit students of class 8 in general.
CBSE NCERT Solutions for Class 8 Science Chapter 15:
Explain why a charged body loses its charge if we touch it with our hand.
When we touch a charged body, with our hand, the excess of accumulated charge
or static charges on it, gets transfer to ground through our body. Thus the charged body loses its charge, and becomes neutral.
Name the scale on which the destructive energy of an earthquake is measured. An earthquake measures 3 on this scale. Would it be recorded by a seismograph? Is it likely to cause much damage?
The destructive energy of an earthquake is measured on Richter Scale. The reading
of magnitude 3 on the Richter scale would be recorded by a seismograph. If the Richter scale gives a reading of magnitude 3, then the earthquake is not likely to cause much damage. Generally, earthquake of magnitudes higher than 5 is considered destructive in nature.
Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself?
Some of the precautions are:
a. Try to move to an open space.
b. We should not take shelter under trees, buildings or overhead power lines.
c. If travelling in a bus or a car, then do not come out when an earthquake strikes. Ask the driver to drive in an open field.
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.
No. We should not carry an umbrella in a thunderstorm. During thunderstorms,
which are accompanied with lightning, electric discharge from the clouds can travel through the metallic rod of the umbrella. This may give an electric shock to the person who is carrying it. Hence, it is not safe to carry an umbrella during lightning.