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 is 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 ........

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Solution

(a) repel ; attract

(b) positive

(c) negative

(d) electrons

(e) friction

(f) repel

(g) Earthing

(h) electric

(i) plate

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Similar questions

Q. Indicate, giving reasons, if the following statements are true or false.
(a) An object which is positively charged contains only protons and no electrons.
(b) An atom with 11 electrons, 11 protons and 12 neutrons is electrically neutral.
(c) An object that is electrically neutral will contain only neutrons.
(d) Two straws rubbed with silk will attract each other.
(e) A balloon rubbed with wool will repel another one that is not rubbed.
(f) When a glass rod is rubbed with silk and made to touch an electroscope, its leaves diverge as they acquire similar charges from the rod.
(g) An electroscope charged by induction develops the same kind of charge as that of the charging body.
(h) To charge an electroscope by conduction, it must be touched by a charged body.
(i) Like charges attract each other while unlike charges repel each other.

Write true or false for each statement:

(a) The number of electrons and protons in an atom are same.

(b) If the charge is not in motion, we call it static electricity.

(d) When an ebonite rod is rubbed with fur, the electrons move from ebonite to fur.

(e) When a glass rod is rubbed with the dry silk cloth, the electrons move from glass to silk.

(f) The cap of gold leaf electroscope is made of copper.

(g) If a glass rod rubbed with silk is brought near the cap of a negatively charged electroscope, the divergence of leaves will decrease.

(h) In induction, a positively charged body can make an uncharged body positively charged.

(i) A lighting conductor saves the building from lighting.

(j) When a comb is rubbed with dry hair both comb and paper get similarly charged.

(k) A glass rod rubbed with silk repels an ebonite rod rubbed with fur.

(l) When an ebonite rod is rubbed with fur, the protons move from the ebonite rod to the fur.

(m) A conductor has a large number of free electrons.

(n) An ebonite rod can be charged by touching it with a charged copper rod.

(o) To find whether a body is charged or not, an uncharged electroscope is used.

(p) To find whether the charge on a body is positive or negative, an uncharged electroscope is used.

(q) If a negatively charged rod is brought near a negatively charged pith ball electroscope, the pith ball will be stuck with the rod.

Q. Choose the correct option and fill in the blanks.
(always repulsion, always attraction, displacement of negative charge, displacement of positive charge, atom, molecule, steel, copper, plastic, inflated balloon, charged object, gold)

(a) There is ................ between like charges.
(b) ...................... is responsible for generation of electric charge in an object.
(c) A lightning conductor is made of a .................. strip.
(d) .................. does not get electrically charged easily by rubbing.
(e) There is ...................... when opposite electric charge come near each other.
(f) A ..................... can be detected with an electroscope.

Which of the following statements is/are false?

a. Lightning is an electric spark on a huge scale which is caused by the accumulation of electric charges in the clouds.
b. Electric charge is the property of matter which is responsible for the electrical phenomenon.
c. The electric charges which appear on a plastic comb when rubbed with dry hair are the static electric charges which remain bound to the surface of an object and do not move.

Fill in the blanks:

(a) Like charges ___ while unlike charges ___.

(b) Mercury is a ___ of electricity while pure water is ___ of electricity.

(d) When an uncharged conductor is brought in contact with the disc of a gold leaf electroscope, it leaves ___.

(e) Charge is shared in charging a conductor by the method of ___.

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(a) repel ; attract (b) positive (c) negative (d) electrons (e) friction (f) repel (g) Earthing (h) electric (i) plate

(a) repel ; attract

(b) positive

(c) negative

(d) electrons

(e) friction

(f) repel

(g) Earthing

(h) electric

(i) plate