1.
What are the small particles called that make up matter?
Correct Answer
C. Atoms
Explanation
Atoms are the small particles that make up matter. They are composed of even smaller particles called protons, neutrons, and electrons. Protons have a positive charge, electrons have a negative charge, and neutrons have no charge. These subatomic particles are the building blocks of atoms, which combine to form molecules and ultimately make up all the matter in the universe.
2.
Why are protons and electrons attracted to each other?
Correct Answer
A. Protons have positive charge and electrons have a negative charge.
Explanation
Protons and electrons are attracted to each other because they have opposite charges. Protons have a positive charge, while electrons have a negative charge. According to the law of electric charges, opposite charges attract each other. Therefore, the positive charge of protons attracts the negative charge of electrons, causing them to be attracted to each other.
3.
Why is it important that the electrons and protons are attracted to each other?
Correct Answer
B. The attraction keeps the electrons from flying away from the nucleus.
Explanation
The attraction between electrons and protons keeps the electrons from flying away from the nucleus. Without this attraction, the electrons would be repelled by the positive charge of the protons and would move away from the nucleus. This would result in an unstable atom with no defined structure. Therefore, the attraction between electrons and protons is important in maintaining the stability and structure of an atom.
4.
The size of the electric force depends upon which two things?
Correct Answer
D. The amount of each charge and the distance between the charges.
Explanation
According to Coulomb's Law, the magnitude of the electric force between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them. This means the electric force increases with greater charges and decreases as the distance between the charges increases.
5.
What method is involved when charges in an uncharged metal object are rearranged without direct contact with the charged object?
Correct Answer
B. Induction
Explanation
Induction is the method involved when charges in an uncharged metal object are rearranged without direct contact with the charged object. Induction occurs when a charged object is brought near the uncharged object, causing a separation of charges within the uncharged object. This happens because the presence of the charged object induces a redistribution of charges in the uncharged object, resulting in a temporary separation of positive and negative charges.
6.
Which of the following is positiely charged?
Correct Answer
A. Proton
Explanation
Protons are positively charged particles found in the nucleus of an atom. They have a positive electric charge, which is equal in magnitude but opposite in sign to the negative charge of electrons. Neutrons, on the other hand, have no charge and are electrically neutral. Electrons are negatively charged particles that orbit the nucleus of an atom. Atoms, as a whole, can be neutral if they have an equal number of protons and electrons. Therefore, the correct answer is proton, as it is the only positively charged particle listed.
7.
Which of the following is NOT an insulator?
Correct Answer
D. Copper
Explanation
Copper is not an insulator because it is a good conductor of electricity and heat. Insulators are materials that do not allow the flow of electric current or heat easily. Copper, on the other hand, has high electrical and thermal conductivity, making it a good conductor.
8.
The method of charging happens when you rub a balloon on your hair is:
Correct Answer
A. Friction
Explanation
Friction charging occurs when two different materials are rubbed together, causing electrons to be transferred from one material to the other. This transfer of electrons results in one object becoming negatively charged (gaining electrons) and the other becoming positively charged (losing electrons). When you rub a balloon on your hair, electrons move from your hair to the balloon, leaving your hair positively charged and the balloon negatively charged, which is why the balloon can stick to surfaces or your hair can stand on end due to the attraction of opposite charges.
9.
The force between two objects is called:
Correct Answer
C. Electric Force
Explanation
Electric force is the correct answer because it refers to the interaction between two charged objects. When two objects have an electric charge, they exert a force on each other, either attracting or repelling each other. This force is known as the electric force. It is responsible for various phenomena, such as the attraction between protons and electrons in an atom, the repulsion between like charges, and the interactions between charged particles in electric circuits.
10.
Clothes often stick together because of:
Correct Answer
B. Static Electricity
Explanation
Clothes often stick together due to static electricity. When two materials rub against each other, electrons can be transferred from one material to another, creating a build-up of electric charge. This can result in the clothes becoming positively or negatively charged, causing them to attract or stick to each other. Static electricity is responsible for various everyday phenomena, such as hair sticking to a comb or balloons sticking to a wall after being rubbed against hair.