Exploring the Investigative World of Science — Science STD 8 — Question

Why should we not wear clothes made of synthetic fibres (like nylon or polyester) while working in the kitchen?

Name two metals which are soft and can be easily cut with a knife.

Name the technique of collecting information about the Earth from an orbiting satellite.

A Voltaic cell, also known as a Galvanic cell, contains two metal plates made of different materials and a liquid called an electrolyte, placed in a glass or plastic container. The plates, called electrodes, are partly dipped in the electrolyte, which is usually a weak acid or a salt solution. A chemical reaction between the plates and the electrolyte produces electricity.
(a) In what way is the Voltaic cell different from the dry cell?
(b) Who discovered the Voltaic or the Galvanic cell? What was the difference of opinion between the two scientists about the electricity generation by the cell, and how was it resolved?

How do you preserve cooked food at home?

We have a stringed musical instrument. The string is plucked inthe middle first with a force of greater magnitude and then with a force of smaller magnitude. In which case would the instrumentproduce a louder sound?

Why are nerve cells long and have branches?

Observe figure

Which of these two circuits A or B shows the correct observation?

In an electroscope, if a negatively charged body is brought in contact with the metal clip, the strips of the electroscope diverge. If now another charged object carrying equal amount of positive charge is brought in contact with the clip, what will happen?

Write a paragraph in your own words on each of the following.
Weeding