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

A standing wave is formed on a string fixed at both ends. If the string is $$2\ \mathrm{m}$$ long and the wavelength of the fundamental mode is $$4\ \mathrm{m}$$, what is the relationship between the string length and the wavelength?

Accepted Answer

The string length is half the wavelength: $$L = \frac{1}{2}\lambda$$

Question 4

Two identical waves meet in phase at a point. What type of interference occurs, and what is the resulting amplitude at that point?

Accepted Answer

Constructive interference; amplitude is doubled

Question 5

Which of the following statements about electric field and electric force is correct?

Accepted Answer

Electric field is a property of space due to a charge, while electric force is the effect experienced by another charge in that field.

Question 6

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 wool to the rod.

Question 7

Which of the following best explains why metals are good electrical conductors?

Accepted Answer

Metals have free electrons that can move easily through the material.

Question 8

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 9

Which of the following is true about electric potential and electric potential energy?

Accepted Answer

Electric potential is the potential energy per unit charge.

Question 10

A household circuit is wired in parallel. Which of the following is a key advantage of this arrangement?

Accepted Answer

Each device receives the full voltage of the power source.

Question 11

A light bulb operates at $$120\ \mathrm{V}$$ and draws $$0.5\ \mathrm{A} of $$current. What is the power consumed by the bulb?

Accepted Answer

$$60\ \mathrm{W}$$

Question 12

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

Accepted Answer

AC reverses direction periodically, while DC flows in one direction only.

Question 13

What is the main difference between a standard magnet and an electromagnet?

Accepted Answer

An electromagnet requires electric current to produce a magnetic field, while a standard magnet does not.

Question 14

A charged particle moves perpendicular to a uniform magnetic field. What is the direction of the force acting on the particle?

Accepted Answer

Perpendicular to both the velocity of the particle and the magnetic field.

Question 15

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

Accepted Answer

A current-carrying wire in a magnetic field experiences a force that causes rotation.

Question 16

According to Faraday’s Law, what is required to induce an electromotive force (emf) in a coil?

Accepted Answer

A change in magnetic flux through the coil.

Question 17

A transformer has $$100$$ turns on its primary coil and $$500$$ turns on its secondary coil. If the input voltage is $$120\ \mathrm{V}$$, what is the output voltage?

Accepted Answer

$$600\ \mathrm{V}$$

Question 18

Which of the following is the main reason high-voltage transmission lines are used to deliver electricity over long distances?

Accepted Answer

High voltage reduces current, minimizing energy loss due to resistance.

Question 19

Which of the following best describes electromagnetic induction?

Accepted Answer

The process of generating an electric current by changing the magnetic field through a conductor.

Question 20

A generator converts which type of energy into electrical energy?

Accepted Answer

Mechanical energy

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

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