Fill in the following blanks with suitable words:
(a) Like charges............; unlike charges...........
(b) Rubbing glass with silk makes a............charge on the glass.
(c) Combing your hair makes a...............charge on the comb.
(d) The negatively charged particles which are transferred from one object to another during charging by friction are called...........
(e) The charging of an object by rubbing it with another object is called charging by.............
(f) In an electroscope, the aluminium leaves diverge because like charges.......
(g) .........is provided in buildings to protect us from electric shocks due to any leakage of electric current.
(h) Lightning is nothing but an.............spark.
(i) Each fragment of earth's crust is called a..........
(a) The correct answer is …. repel and …. attract.
There are two types of charges: Positive charge and negative charge. Like charges repel each other and unlike charges attract each other.
(b) The correct answer is ……positive.
After rubbing the glass rod with silk cloth, the glass rod becomes positively charged. The silk cloth becomes negatively charged.
(c) The correct answer is …. negative.
The combing of hair make the comb negatively charged. It is able to attract tiny pieces of paper which are neutral.
(d) The correct answer is …. electrons.
For example, when a glass rod is rubbed with silk, some of the electrons from the glass atoms are transferred to silk. Due to the deficiency of electrons in the glass atoms, it becomes positively charged. Whereas the silk has acquired electrons, it becomes negatively charged.
(e)The correct answer is …. friction.
The electric charges generated by rubbing are static electric charges. These electric charges remain bound on the surface of the charged object.
(f) The correct answer is … repel.
The aluminium foil strips receive the same charge from the charged objects. The strips carrying similar charges repel each other and they become wide open.
(g) The correct answer is …... Earthing.
The process of transferring of charge from a charged object to the earth is called earthing.
(h) The correct answer is …... electric.
Lightening is the name given to the flash of light which occurs in the sky during the rainy season. The process of electric discharge between clouds and the earth or between different clouds causes lightning.
(i)The correct answer is …. Plate.
The outermost layer of the earth is fragmented. Each fragment is called a plate. These plates are in continual motion.