Question 1

A sound wave travels through air with a frequency of $$440\ \mathrm{Hz}$$ and a wavelength of $$0.78\ \mathrm{m}. $$What is the speed of sound in air based on these values?

Accepted Answer

$$343\ \mathrm{m/s}$$

Question 2

Which of the following best describes the difference between a transverse wave and a longitudinal wave?

Accepted Answer

In a transverse wave, particle displacement is perpendicular to wave direction; in a longitudinal wave, displacement is parallel to wave direction.

Question 3

Two waves of equal amplitude and frequency travel in opposite directions and overlap. What phenomenon results, and what is a key feature of this phenomenon?

Accepted Answer

A standing wave forms, characterized by nodes and antinodes.

Question 4

A neutral metal sphere is brought near a negatively charged rod but does not touch it. The sphere becomes polarized. What happens to the charges in the sphere?

Accepted Answer

Electrons in the sphere are repelled, causing one side to become more positive and the other more negative.

Question 5

Which of the following statements correctly distinguishes between electric field and electric force?

Accepted Answer

Electric field is a property of space due to charges; electric force is the effect of the field on a charge.

Question 6

A $$12\ \mathrm{V}$$ battery is connected to a resistor, and a current of $$2\ \mathrm{A}$$ flows. What is the resistance of the resistor?

Accepted Answer

$$6\ \Omega$$

Question 7

Why are household electrical circuits wired in parallel rather than in series?

Accepted Answer

So that each device receives the full voltage and can operate independently.

Question 8

Which of the following best describes the difference between electrical conductors and insulators?

Accepted Answer

Conductors allow free movement of electrons; insulators do not.

Question 9

A $$60\ \mathrm{W}$$ light bulb operates at $$120\ \mathrm{V}. $$What is the current through the bulb?

Accepted Answer

$$0.5\ \mathrm{A}$$

Question 10

Which of the following is true about the force between two electric charges?

Accepted Answer

Like charges repel, and opposite charges attract.

Question 11

A bar magnet is cut in half. What happens to the magnetic poles?

Accepted Answer

Each half becomes a new magnet with both a north and a south pole.

Question 12

Which of the following best explains how an electric motor works?

Accepted Answer

A current-carrying wire in a magnetic field experiences a force, causing rotation.

Question 13

A transformer has $$100$$ turns on its primary coil and $$400$$ turns on its secondary coil. If the input voltage is $$120\ \mathrm{V}$$, what is the output voltage?

Accepted Answer

$$480\ \mathrm{V}$$

Question 14

Which of the following is a correct statement about electromagnetic induction?

Accepted Answer

A changing magnetic field induces an electric current in a conductor.

Question 15

A generator converts mechanical energy into electrical energy. Which law explains this process?

Accepted Answer

Faraday's Law

Question 16

Which of the following best describes the difference between electric potential and electric potential energy?

Accepted Answer

Electric potential is energy per unit charge; electric potential energy is the total energy a charge has due to its position.

Question 17

A wire carries a current of $$5\ \mathrm{A} in a $$region with a magnetic field of $$0.2\ \mathrm{T}. If $$the wire is $$0.5\ \mathrm{m}$$ long and perpendicular to the field, what is the force on the wire?

Accepted Answer

$$0.5\ \mathrm{N}$$

Question 18

Which of the following is true about alternating current (AC) and direct current (DC)?

Accepted Answer

AC reverses direction periodically; DC flows in one direction only.

Question 19

Which of the following is a correct statement about power transmission from power plants to homes?

Accepted Answer

High voltage is used to reduce energy loss during transmission.

Question 20

A plastic rod is rubbed with wool and becomes negatively charged. Which charging method is this, and what happens at the atomic level?

Accepted Answer

Charging by friction; electrons are transferred from the wool to the rod.

Physics Study Guide: Waves, Electricity, Magnetism, and Electromagnetic Induction

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