G7A_Q3_POST TEST 6

A charged object is brought near a metal ball that is mounted on a rubber sheet. If the metal ball acquired a negative charge after it was grounded momentarily, what must be the charge of the object that was brought near it?

• Neutral

• Positive

• Negative

• Both Positive and Negative

Which of the following describes the usual way by which a material can gain a positive charge?

• By gaining protons

• By gaining electrons

• By losing protons

• By losing electrons

Which of the following statements about atomic structure is not true?

• Atoms are mostly empty spaces.

• All atoms of the same atomic number are atoms of the same element.

• Most of the mass of the atom is concentrated at the nucleus

• An atom can gain or lose electrons without charging its charge

Which of the following can be attracted by a positively charged object?

• positively charged object.

• negatively charged object.

• a neutral object

• Both positive and negatively charged object

A build up charge of an object is called

• Conduction

• Static electricity

• Induction

• Friction

If you comb your hair and the comb becomes positively charged, what will happen to your hair?

• It will remain uncharged

• It will be repelled by the comb.

• It will become positively charged.

• It will become negatively charged.

By direct touch, charging an object is

• Conduction

• Grounding

• Friction

• Induction

These are good conductors because they have loose electrons.

• copper

• metal

• aluminum

• All of the above

What do you call the process of charging a conductor by bringing it near another charged object?

• induction

• polarization

• neutralization

• conduction

A negatively charged rod is brought near a metal can that rests on a wooden box. You touch the opposite side of the can momentarily with your finger. If you remove your finger before removing the rod, what will happen to the can?

• It will be discharged.

• Its charge will remain as it was.

• It will become positively charged.

• It will become negatively charged.