Question

Q.8 Long answer type questions. (Any 3)

(1) Write a short note on global warming.

(2) What are the two types of defects of vision. Explain.

(3) Describe the three methods of charging a body.

(4) How are conductors different from insulators?

(5) What are the effects of force?​

Answer 1

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Answer 2

Explanation:

1. Global warming is that the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) thanks to human activities, primarily fuel burning, which increases heat-trapping greenhouse emission levels in Earth's atmosphere.
2. These are (i) myopia or near-sightedness (ii) Hypermetropia or far – sightedness (iii) Presbyopia. Myopia is also known as near-sightedness. A person with myopia can see nearby objects clearly but cannot see distant objects distinctly.
3. There are three methods to charge a body, namely, charging by friction, conduction and induction. ... This deficit of electrons on the glass rod makes it positively charged and the excess of electrons makes the silk cloth negatively charged. In this method, there is a transfer of electrons from one body to another.
4. Conductors are materials that permit electrons to flow freely from particle to particle.Conductors allow for charge transfer through the free movement of electrons. In contrast to conductors, insulators are materials that impede the free flow of electrons from atom to atom and molecule to molecule.
5. A force acting on an object causes the object to change its shape or size, to start moving, to stop moving, to accelerate or decelerate. When there's the interaction between two objects they exert a force on each other, these exerted forces are equal in size but opposite in direction.