atomic theory Quiz

What is the study of atoms and electrons called?

• Molecular theory

• Atomic theory

• Quantum theory

• Relativity theory

Answer explanation

The study of atoms and electrons is called Atomic theory, which focuses on the behavior and properties of these fundamental particles.

What is the center of an atom called?

• Electron

• Proton

• Nucleus

• Neutron

Answer explanation

The center of an atom is called the nucleus, where protons and neutrons are located. Electrons orbit around the nucleus.

Which particles in the nucleus of an atom have no charge?

• Protons

• Electrons

• Neutrons

• Molecules

Answer explanation

Neutrons in the nucleus of an atom have no charge, unlike protons and electrons which are positively and negatively charged, respectively.

What charge do electrons have?

• Positive

• Negative

• Neutral

• No charge

Answer explanation

Electrons have a negative charge, making the correct answer choice 'Negative'.

What causes free electrons to drift in a conducting material?

• Attraction to the negative plate and repulsion by the positive plate

• Attraction to the positive plate and repulsion by the negative plate

• Attraction to both positive and negative plates

• Repulsion by both positive and negative plates

Answer explanation

Attraction to the positive plate and repulsion by the negative plate

What is the flow of electrons in a conducting material called?

• Electric charge

• Electric potential

• Electric current

• Electric resistance

Answer explanation

The flow of electrons in a conducting material is called electric current, making it the correct choice.

What happens to free electrons in a copper wire with no charge?

• They move from the negative to the positive terminal

• They move around randomly

• They stay stationary

• They move from the positive to the negative terminal

Answer explanation

In a copper wire with no charge, free electrons move around randomly due to thermal energy, creating electrical resistance.

What happens to free electrons in a copper wire connected to a battery?

• They move from the positive to the negative terminal

• They move around randomly

• They move from the negative to the positive terminal

• They stay stationary

Answer explanation

They move from the negative to the positive terminal

What is the direction of actual electron flow in an electric current?

• From positive to negative

• From negative to positive

• From neutral to positive

• From positive to neutral

Answer explanation

Actual electron flow in an electric current goes from negative to positive, opposite to the conventional current direction.

What did scientists originally believe about the direction of electric current flow?

• It flowed from negative to positive

• It flowed from positive to negative

• It flowed from neutral to positive

• It flowed from negative to neutral

Answer explanation

Scientists originally believed that electric current flow from positive to negative.