Select the correct alternative:

(a) when a glass rod is rubbed with the dry silk cloth, the charge acquired by the silk cloth is :

(i) positive

(ii) negative

(iii) both positive and negative

(iv) none of the above.

(b) When an ebonite rod is rubbed with fur,the rod acquires:

(i) positive charge

(ii) negative charge

(iii) no charge

(iv) none of the above.

(c) When a negatively charged body is brought closer to another negatively charged body, then they will show :

(i) attraction

(ii) no effect

(iii) repulsion

(iv) none of the above.

(d) Charging a conductor by bringing another charged conductor close to it without touching is called :

(i) induction (ii) conduction

(iii) convection (iv) radiation.

(e) The factor responsible for charging a conductor is :

(i) transfer of protons

(ii) transfer of neutrons

(iii) transfer of electrons

(iv) transfer of protons and electrons.

(f) Two objects when rubbed together get charged.The charges on them are:

(i) equal and opposite

(ii) equal and similar

(iii) unequal and similar

(iv) unequal and opposite

(g) When a glass rod is rubbed with silk,the glass rod and the silk get charged because:

(i) electrons are transferred from the silk to the glass rod

(ii) electrons are transferred from the glass rod to the silk.

(iii) protons are transferred from the silk to the glass rod.

(iv) protons are transferred from the glass rod to the silk.

(h) The conductor of electricity is :

(i) wood (ii) glass

(iii) ebonite (iv) human body

(i) A gold leaf electroscope is to be charged positively by conduction.For this:

(i) a positively charged rod is held close to near the disc of electroscope.

(ii) a positively charged rod is placed in contact with the disc of electroscope.

(iii) a negatively charged rod is held close to near the disc of electroscope.

(iv) a negatively charged rod is touched with the disc of electroscope.

(j) A glass rod rubbed with silk is touched with the disc of negatively charged gold leaf electroscope.The divergence of leaves will:

(i) decrease

(ii) increase

(iii) remain unchanged

(iv) first decreases and then increases.

(k) The rod in gold leaf electroscope is made up of:

(i) wood (ii) brass

(iii) glass (iv) ebonite

(l) Lighting conductor is made up of :

(i) copper (ii) glass

(iii) ebonite (iv) wood

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Solution

(a) When a glass rod is rubbed with a dry silk cloth, the charge acquired by the silk cloth is
ANS (ii) negative

(b) When an ebonite rod is rubbed with fur, the rod acquires
ANS (ii) negative charge

(c) When a negatively charged body is brought closer to another negatively charged body, then they will show
ANS (iii) repulsion

(d) Charging a conductor by bringing another charged conductor close to it without touching is called
ANS (i) induction

(e) The factor responsible for charging a conductor is
ANS (iii) transfer of electrons

(f) Two objects when rubbed together get charged. The charges on them are
ANS (i) equal and opposite

(g) When a glass rod is rubbed with silk, the glass rod and the silk get charged because
ANS (ii) electrons are transferred from the glass rod to the silk

(h) The conductor of electricity is
ANS (iv) human body

(i) A gold leaf electroscope is to be charged positively by conduction. For this
ANS (ii) a positively charged rod is placed in contact with the disc of the electroscope

(j) A glass rod rubbed with silk is touched with the disc of a negatively charged gold leaf electroscope. The divergence of
leaves will
ANS (i) decrease

(k) The rod in a gold leaf electroscope is made up of
ANS (ii) brass

(l) Lightning conductor is made up of:
ANS (i) copper

Suggest Corrections

Similar questions

Match the following:

Column A Column B

(a) Two like charges (i) negative charge

(b) Two unlike charges (ii) repel

(d) Silk is an (iv) attract

(e) Ebonite rod rubbed with fur acquires (v) conductor

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.

When a glass rod is rubbed with a piece of silk cloth, then :

(a) the glass rod and silk cloth both acquire the positive charge.

(b) the glass rod becomes positively charged while the silk cloth has a negative charge.

(d) the glass rod becomes negatively charged while the silk cloth has a positive charge.

Question 23
An electrolytic cell consists of:
(i) positively charged cathode.
(ii) negatively charged anode.
(iii) positively charged anode.
(iv) negatively charged cathode.

(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (ii) ad (iv)

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.

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