Matter in Our Surroundings — Science STD 9 — Question

A person takes concentrated solution of salt, after sometime, he starts vomiting. What is the phenomenon responsible for such situation? Explain.

Due to heavy rains and speedy winds a tree broke and fell on the road. Two persons from local shops came and begin to remove that broken part of the tree, but in vain as the log was too heavy. A passerby came to their help with a few solid heavy sticks. Consequently, the heavy log was put aside and the commutation on the road began as usual.
(a) Comment upon the value(s) displayed by the passerby?
(b) Name the energy stored when the heavy log of the tree was lifted to some height?

Explain how, impure copper sulphate can be purified by crystallization.

What are permanent tissues of the plants? Give their characteristics.

In a cluster of hutments, many people are suffering from malaria. Mention the unhygienic conditions that must be prevailing in that locality. How does a doctor confirm malaria?

What is the contribution of Margulis and Schwartz?

How is rain produced?

If the distance between masses of two objects is increased by five times, by what factor would the mass of one of them have to be changed to maintain the same gravitational force? Would there be an increase or a decrease in the same?

Rutherford's atomic model was a reasonably good model of structure of atom based on the famous particle scattering experiment. However, it was subsequently modified by Neils Bohr and later on, by others. The resulting improvements in the understanding of atomic structure have greatly contributed to further scientific advancement. There are many other similar examples in scientific field when original contributors happily accept modifications in their ideas.
Answer the following questions based on the above information:
I. Name the scientific values associated with above anecdotes.
II. Give any example from your life experiences so far which reflects display of such a value by you as an individual.
III. In what way such a personal attribute is likely to help you?

Can we apply Newton’s third law to the gravitational force? Explain your answer.