REY MAR AQUINO 21

A coulomb is the same as:

• an ampere·second

• half an ampere·second2

• an ampere/meter^2

• an ampere/second

• a newton meter^2

A kiloampere·hour is a unit of:

• charge

• current

• charge per time

• power

• energy

The magnitude of the charge on an electron is approximately:

• 10^-19 C

• 10^23 C

• 10^-23 C

• 10^9 C

The total negative charge on the electrons in 1 mol of helium (atomic number 2, molar mass 4) is:

• 3.8 × 10^5 C

• 4.8 × 10^4 C

• 9.6 × 10^4 C

• 1.9 × 10^5 C

• 7.7 × 10^5 C

The total negative charge on the electrons in 1kg of helium (atomic number 2, molar mass 4) is:

• 48C

• 2.4 × 10^7 C

• 4.8 × 10^7 C

• 9.6 × 10^8 C

• 1.9 × 10^8 C

The charge on a glass rod that has been rubbed with silk is called positive:

• by arbitrary convention

• so that the proton charge will be positive

• to conform to the conventions adopted for G and m in Newton’s law of gravitation

• because like charges repel

• because glass is an insulator

To make an uncharged object have a negative charge we must:

• add some electrons

• add some atoms

• remove some atoms

• write down a negative sign

• remove some electrons

To make an uncharged object have a positive charge:

• remove some neutrons

• add some neutrons

• add some electrons

• remove some electrons

• heat it to cause a change of phase

When a hard rubber rod is given a negative charge by rubbing it with wool:

• positive charges are transferred from rod to wool

• negative charges are transferred from rod to wool

• positive charges are transferred from wool to rod

• negative charges are transferred from wool to rod

• negative charges are created and stored on the rod

An electrical insulator is a material:

• containing no electrons

• through which electrons do not flow easily

• that has more electrons than protons on its surface

• cannot be a pure chemical element

• must be a crystal