MCQ Questions

Question No. 1

A rubber rod is rubbed with a woollen cloth. a) Which of the two will become positively charged? b) Which of the two will gain electrons?

Answer :

Question No. 2

Study the diagrams (which show charge transfer by induction) and indicate the type of charge found at each area marked a, b, c, d, e and f.

Answer :

Question No. 3

A neutral polystyrene ball is suspended from a support and a negatively charged rod is brought into contact with it. The sequence of diagrams shows what happens to the ball.

Answer :

Question No. 4

Diagram shows a negatively charged electroscope.

Answer :

a) Were electrons added to or removed from the electroscope ?

Question No. 5

When you charge a Perspex ruler by rubbing it with a cotton cloth, you give the ruler a:

Answer :

positive charge by the method of friction

negative charge by the method of contact

positive charge by the method of contact

negative charge by the method of friction

Question No. 6

When an object becomes positively charged, it:

Answer :

gains protons

loses protons

gains electrons

loses electrons

Question No. 7

Which one of the following cannot be used to store charges for a long period of time?

Answer :

a capacitor

a gold leaf electroscope

an electrophorus

a Leyden jar

Question No. 8

A charged acetate sheet (P) attracts a second charged acetate sheet (Q), but repels a negatively charged acetate sheet (R). We can conclude that:

Answer :

P is positively charged and Q is negatively charged

P is negatively charged and Q is positively charged

both P and Q are negatively charged

both P and Q are positively charged

Question No. 9

A negatively charged rod is used to positively charge a polystyrene ball. The method used in this charging process is most probably:

Answer :

by friction (by rubbing the polystyrene ball with the rod)

by contact (by touching the polystyrene ball with the rod)

by induction (by bringing the rod near the polystyrene ball and then earthing the ball)

by contact and induction (by touching the polystyrene ball with the rod and then earthing the ball)

Question No. 10

Figure 2.61 shows the metal disc of a charged electrophorus being removed from its insulating base. By touching the metal disc with a finger, we will finally have:

Answer :

a negatively charged electrophorus

a positively charged electrophorus

a neutral electrophorus

an electrophorus with both types of charge

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