Chapter 20 Electricity: Test A

The unit of charge is the:

• ohm.

• ampere.

• volt.

• coulomb.

An object with equal amounts of positive and negative charge is called:

• positively charged.

• negatively charged.

• neutral.

• statically charged.

A tiny imbalance of charge on an object is called ____ electricity.

• inductive

• static

• contact

• charged

The charge of a proton and the charge of an electron have:

• different amount of charge and opposite sign.

• the same amount of charge and opposite sign.

• different amount of charge and the same sign.

• the same amount of charge and the same sign.

Object A is attracted to object B. If object A is positively charged, then object B is:

• positively charged.

• negatively charged.

• electrically neutral.

• a coulomb.

Lightning bolts occur when negative charge in the clouds:

• flows to the positively charged ground.

• flows to the negatively charged ground.

• flows to the negatively charged clouds.

• causes thunder to sound.

Suppose you rub an inflated party balloon on a carpet, hold the balloon next to a wall, and discover that it "sticks" to the wall. Why did the balloon stick to the wall?

• The total charge on the balloon and wall becomes zero, so attraction between the two can occur.

• Like charges on the balloon and wall cause an attraction between the two.

• Balloons contain a special "atomic glue" that allows them to cling to other objects.

• Excess charge builds up on the balloon and electrostatic forces allow the balloon and wall to be attracted to one another.

When a glass rod is rubbed with silk, the rod becomes positively charged due to the transfer of:

• electrons to the rod.

• protons to the silk.

• electrons to the silk.

• protons to the rod.

Garrick rubs an inflated balloon against his hair. He then touches the balloon against a non-conducting wall. Which picture shows how the charge on the balloon and the wall are distributed?

• A

• B

• C

• D

A circuit with a switch turned to the OFF position or a circuit with any break is called:

• a closed circuit.

• a short circuit.

• a resistor circuit.

• an open circuit.