1. What are bound electrons in an insulator?
A.
Electrons freely moving throughout the material
B.
Electrons tightly attached to their parent atoms
C.
Electrons found only outside the material
D.
Electrons with no electric charge
Correct Answer:
Electrons tightly attached to their parent atoms
Explanation:
Bound electrons are tightly held by their parent atoms and cannot move freely through an insulator.
2. Why does an insulator have very few free electrons?
A.
Its electrons are strongly bound to atoms
B.
Its atoms contain no electrons
C.
Its electrons have positive charge
D.
Its nuclei repel all electrons
Correct Answer:
Its electrons are strongly bound to atoms
Explanation:
In an insulator, the electrons are strongly bound to their atoms, so very few are available for free movement.
3. The electrons in an insulating material are generally:
A.
Loosely bound to atoms
B.
Strongly bound to atoms
C.
Absent from atoms
D.
Located only in the nucleus
Correct Answer:
Strongly bound to atoms
Explanation:
Insulators contain electrons that are strongly bound to their parent atoms, which restricts their movement.
4. When an electric field is applied to an insulator, its bound electrons usually:
A.
Leave the material completely
B.
Move freely through the material
C.
Shift slightly relative to their nuclei
D.
Change into protons
Correct Answer:
Shift slightly relative to their nuclei
Explanation:
Bound electrons may undergo a small displacement relative to their nuclei, but they do not move freely through the insulator.
5. Which statement about bound electrons is correct?
A.
They can easily travel from one atom to another
B.
They remain associated with particular atoms
C.
They have no interaction with atomic nuclei
D.
They are always positively charged
Correct Answer:
They remain associated with particular atoms
Explanation:
Bound electrons remain associated with particular atoms because the attraction to their nuclei holds them in place.
6. In an insulator, the movement of bound electrons is mainly restricted by:
A.
Their strong attraction to atomic nuclei
B.
Their attraction to protons outside the material
C.
The absence of atomic nuclei
D.
Their positive electric charge
Correct Answer:
Their strong attraction to atomic nuclei
Explanation:
The strong electrostatic attraction between electrons and atomic nuclei keeps bound electrons attached to their atoms.
7. Which material property is associated with electrons being tightly bound to atoms?
A.
High electrical conductivity
B.
Low electrical conductivity
C.
A large number of free electrons
D.
Complete absence of electric charge
Correct Answer:
Low electrical conductivity
Explanation:
Tightly bound electrons cannot move freely, so the material has low electrical conductivity.
8. What happens to the bound electrons of an insulator when no external electric field is applied?
A.
They move continuously through the material
B.
They remain attached to their parent atoms
C.
They leave all the atoms
D.
They become positively charged nuclei
Correct Answer:
They remain attached to their parent atoms
Explanation:
Without an external electric field, bound electrons remain associated with their parent atoms.
9. Which of the following best distinguishes a bound electron from a free electron?
A.
A bound electron is attached to an atom
B.
A bound electron has no mass
C.
A bound electron has positive charge
D.
A bound electron is found only in the nucleus
Correct Answer:
A bound electron is attached to an atom
Explanation:
A bound electron is held by an atom, whereas a free electron can move through the material.
10. Why do bound electrons in an insulator not produce a large electric current?
A.
They cannot move freely through the material
B.
They do not have electric charge
C.
They are heavier than atomic nuclei
D.
They are located outside the material
Correct Answer:
They cannot move freely through the material
Explanation:
Electric current requires the movement of charge; bound electrons cannot move freely, so they do not produce a large current.
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