Bennett Mechanical Test Acoustics and Optics 2

Question 1

Sound travels fastest through which medium?

Accepted Answer

Steel

Answer

Sound moves fastest through dense solids like steel because tightly packed molecules transmit vibrations quickly.

Question 2

When light passes from air into water, it bends because the light:

Accepted Answer

Slows down

Answer

Light slows when entering denser water, and this speed change bends (refracts) the ray.

Question 3

An echo is produced when sound waves:

Accepted Answer

Reflect off a surface

Answer

An echo is sound reflecting off a hard surface and returning to the listener.

Question 4

A higher-frequency sound wave is heard as a sound with a:

Accepted Answer

Higher pitch

Answer

Frequency determines pitch, so higher frequency means a higher pitch.

Question 5

A convex (converging) lens is commonly used to:

Accepted Answer

Magnify objects

Answer

A convex lens converges light to a focal point and can magnify objects.

Bennett Mechanical Test Practice Test