Some Natural Phenomena — Science STD 8 — Question

A man is pushing a cart down a slope. Suddenly the cart starts moving faster and he wants to slow it down. What should he do?

Differentiate between the following. Flora and fauna.

Give reason why: Copper metal is used for making electric wires.

Last Monday, Ankush woke up late in the morning. So, he saw the time and suddenly realised that he had got late for an interview, which he was supposed to give after reaching the venue by the right time. Immediately, he turned ON the geyser but it did not work. He got more tensed, then he used an electric Iron rod through which he could get some boiled water for his bath. Actually, there was an earthing problem in the switch board which he was unaware of. He was barefoot and was just about to switch ON the electric iron rod but at the same he was stopped from doing so by one of his room partner living with him. It could be dangerous for Ankush.
(i) Explain in brief that what could be happened with Ankush, if he switched ON the electric iron rod (without wearing any slippers in his foot).
(ii) Mention the values showed by Ankush's friend.

How will you charge a plastic comb (plastic scale or plastic pen) by the method of friction?

Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. How will she find the nature of the gas?

Which force keeps the members of the Solar System bound to the Sun?

A positively charged object repels another charged object kept close to it. What is the nature of charge on the other object?

Name the device used to split white light into seven colours.