Question 1

Which of the following fundamental forces is responsible for holding protons and neutrons together in the nucleus?

Accepted Answer

Strong nuclear force

Question 2

What is the SI unit of electric charge?

Accepted Answer

Coulomb

Question 3

Which equation correctly expresses Coulomb's Law for the force between two point charges $q_1$ and $q_2$ separated by distance $r$ in vacuum?

Accepted Answer

$F = \frac{q_1 q_2}{4 \pi \epsilon_0 r^2}$

Question 4

If the electric field at a point is $E$ and the force experienced by a charge $q$ at that point is $F$, which equation defines the electric field?

Accepted Answer

$E = F/q$

Question 5

Which SI prefix corresponds to $10^{-6}$?

Accepted Answer

micro

Question 6

A proton and an electron are separated by $5.29 	imes 10^{-11}$ m. What is the direction of the Coulomb force acting on the electron?

Accepted Answer

Towards the proton

Question 7

Which of the following best describes the effect of dielectric materials on electric forces?

Accepted Answer

They attenuate (reduce) electric forces more rapidly with distance than in vacuum.

Question 8

What is the relative permittivity ($\epsilon_r$) of water at 298 K?

Accepted Answer

78.0

Question 9

Which equation gives the electric field at a distance $r$ from a point charge $q$ in vacuum?

Accepted Answer

$E = \frac{q}{4 \pi \epsilon_0 r^2}$

Question 10

In Millikan's oil drop experiment, what is the primary purpose of applying a potential difference across the plates?

Accepted Answer

To exert an electric force on the charged drop

Question 11

Which SI base unit is used to measure luminous intensity?

Accepted Answer

candela

Question 12

What is the correct SI derived unit for pressure?

Accepted Answer

kg m$^{-1}$ s$^{-2}$

Question 13

Which of the following statements about electrostatic forces in chemistry is correct?

Accepted Answer

Electrostatic forces dominate interactions between charged particles at the atomic scale.

Question 14

Given the equation for relative permittivity $\epsilon = \epsilon_r K_0$, what does $\epsilon_r$ represent?

Accepted Answer

The relative permittivity of the medium

Question 15

Which of the following is a correct SI derived unit for energy?

Accepted Answer

kg m$^2$ s$^{-2}$

Question 16

In the context of the molecular scale, why are strong and weak nuclear forces considered negligible outside the nucleus?

Accepted Answer

Because their range is extremely short compared to atomic distances

Question 17

Which equation would you use to calculate the force between two protons separated by a distance $r$ in water, given the relative permittivity $\epsilon_r$?

Accepted Answer

$F = \frac{q_1 q_2}{4 \pi \epsilon_0 \epsilon_r r^2}$

Question 18

In Millikan's oil drop experiment, which force is balanced by the electric force when the drop is stationary in the electric field?

Accepted Answer

Gravitational force

Question 19

Which of the following is the correct SI base unit for temperature?

Accepted Answer

kelvin

Question 20

Which equation describes the Lennard-Jones potential, responsible for van der Waals forces?

Accepted Answer

$V(r) = 4 \epsilon \left[ \left( \frac{\sigma}{r} \right)^{12} - \left( \frac{\sigma}{r} \right)^6 \right]$

Electrostatics and Coulomb's Law: The Physical Basis of Chemistry

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