Which of the following particles is a part of an atom?

• electron

• proton

• neutron

• all of the above

An atom usually has _____________.

• equal number of protons and electrons

• unequal number of protons and electrons

• more protons than electrons

• more electrons than protons

The substance that loses the electrons gets a _______ charge and the one that gains the electrons gets ______ charge.

• negative; a positive

• positive; no charge

• positive; a negative

• negative; no charge

The build up of charge on an object is called ___________.

• refraction

• current electricity

• dispersion

• static electricity

When a comb is rubbed with a woolen cloth, it gains ______ from the woolen cloth and becomes negatively charged.

• protons

• electrons

• neutrons

• phonons

________ exists when charges are at rest. However, ________ exists when the charges move continuously.

• current electricity; static electricity

• direct current; alternating current

• static electricity; current electricity

• alternating current; direct current

Choose the correct statement.

• If the electrons always flow in the same direction, then the resulting current is said to be alternating current.

• If the electrons always flow in the same direction, then the resulting current is said to be direct current.

• If the direction of motion of electrons reverses periodically, then the resulting current is said to be direct current.

• If the direction of motion of electrons reverses periodically, then the resulting current is said to be static charge.

When a comb rubbed with a woolen cloth is brought near bits of paper, _______.

• the bits of paper stick to the comb

• the bits of paper move away from the comb

• a few of the bits of paper stick to the comb and the others move away from the comb

• the bits of paper start circulating around the comb

It is safe to stand under a tree in a thunder storm

• True

• False

What is faster the lightning or the thunder?

• Lightning

• Thunder