Unit 13: Sound

1

Echo is heard when reflected sound reaches the ear after:

A 0.01 s B 0.05 s C 0.1 s D 1 s

2

Minimum distance for hearing echo in air is about:

A 5 m B 10 m C 17 m D 50 m

3

The sound produced by regular vibrations is called:

A Noise B Music C Echo D Ultrasound

4

In acoustics, absorption of sound is increased by:

A Hard surfaces B Smooth walls C Soft materials D Metal sheets

5

Sound energy is a form of:

A Chemical energy B Mechanical energy C Electrical energy D Nuclear energy

6

The bones of middle ear are called:

A Vertebrae B Ossicles C Cartilage D Ligaments

7

Unpleasant and unwanted sound is called:

A Music B Echo C Noise D Pitch

8

Sound cannot travel through:

A Air B Water C Steel D Vacuum

9

Frequency of audible sound for humans ranges from:

A 0–20 Hz B 20–20,000 Hz C Above 20,000 Hz D Below 20 Hz

10

Infrasound has frequency:

A Above 20 kHz B Equal to 20 kHz C Below 20 Hz D Between 20 Hz and 20 kHz

11

Echo is an example of:

A Refraction B Reflection C Diffraction D Interference

12

Acoustics deals with:

A Light B Electricity C Sound D Heat

13

Pitch of sound depends upon:

A Amplitude B Frequency C Speed D Echo

14

Which animal can hear ultrasound?

A Elephant B Dog C Bat D Cow

15

The part of ear that collects sound waves is:

A Cochlea B Auditory nerve C Ear canal D Pinna

16

Reflection of sound follows the law of:

A Refraction B Diffraction C Reflection D Interference

17

Sound is produced due to:

A Reflection B Vibration C Refraction D Diffraction

18

Eardrum is also known as:

A Cochlea B Tympanic membrane C Oval window D Semicircular canal

19

Which instrument is used to measure sound level?

A Thermometer B Barometer C Sound level meter D Voltmeter

20

Sound waves are:

A Transverse waves B Electromagnetic waves C Longitudinal waves D Surface waves

21

A hall designed for good sound quality is called:

A Laboratory B Auditorium C Classroom D Studio

22

The graphical representation of sound is called:

A Spectrum B Waveform C Diagram D Chart

23

Excessive reverberation can be reduced by using:

A Glass B Marble C Curtains D Concrete

24

Auditory nerve carries signals to:

A Heart B Lungs C Brain D Eye

25

Sound requires which medium to travel?

A Only solids B Only liquids C Only gases D Material medium