PAS Physics Grade 9

A glass rod becomes positively charged when it is rubbed with silk. The glass rod becomes charged because it.....

• gains protons

• gains electrons

• loses electrons

• gains protons and loses electrons

If a rubber rod repels a pith ball, what can be deduced about the charges on the rubber rod and the pith ball?

• Only the rod is charged

• Only the pith ball is charged

• Either the rod or the pith ball is charged, but not both.

• Both the rod and pith ball carry like charges.

How does an electrical conductor differ from an electrical insulator?

• Charged particles are free to move about both conductors and insulators.

• Charged particles cannot move at all in the insulators.

• Charged particles are free to move about conductors.

• Insulators have a high ability to conduct electricity.

The SI unit of electric charge is the.....

• coulomb

• ampere

• watt

• volt

The figure below shows a negatively-charged rod held near, but not touching, a metal rod. Which of the following statements best describes the movement of the charges?

• The electrons from the charged rod jump across the gap and enter the metal rod.

• The electrons in the metal rod move from X to Y.

• The positive charges in the metal rod move from Y to X.

• The positive charges in the charged rod move from X to Y.

Which of the following set-ups cannot be used to determine the resistance of resistor R?

• A

• B

• C

• D

Choose the correct statements below.

• The SI unit of charge is volt.

• Conventional current is in the direction of electron flow.

• A thicker wire has a lower resistance than a thinner wire.

• A shorter wire has a bigger resistance than a longer wire.

Electric charge that has electric field lines directed away from the charge.

• Neutral atom

• Positive charge

• Electron

• Negative charge

Materials that are charged through induction.

• Insulators

• Conductors

• Rubber

• None

The ammeter reading in the circuit below is 1 A. Which of the following could be the voltmeter reading and resistance of the resistor?

• V = 12 V

  R = 6 Ω

• V = 1 V

  R = 2 Ω

• V = 4 V

  R = 0.25 Ω

• V = 10 V

  R = 10 Ω