1. What is the back-and-forth movement of an object? *

1 point

A. electricity

B. heat

C. light

D. sound

2. Which of the following will produce the loudest sound? It is a small rod dropped on a/into _________. *

1 point

A. carpet

B. mat

C. tiled floor

D. water

3. Which objects blocks the sound from passing through? *

1 point

A. cloth

B. insulation foam

C. metal

D. wood

4. Which of the following is a sound property? *

1 point

A. decibel

B. pitch

C. tuning fork

D. vibrations

5. How do you call the sound that is soft, pleasant and cannot cause disturbance? *

1 point

A. harmonious

B. instrumental

C. noise

D. unpleasant

6. Which of the following does not affect the pitch of sound? *

1 point

A. state of materials

B. amount of materials

C. diameter of the objects

D. temperature of materials

7. What unit is used to represent frequency? *

1 point

A. Decibels

B. Hertz

C. Newtons

D. Ultrasound

8. When can we say that the sound is harmonious? The sound produced ____. *

1 point

A. is pleasing to ears

B. reaches to 6000 decibels

C. can be heard by everybody

D. causes other objects to vibrate

9. What is the unit used in measuring sound? *

1 point

A. decibels

B. kilometers

C. liters

D. yard

10. Which of the following materials where sound can travel? *

1 point

A. metals

B. water

C. wood

D. all of the above

Please answer it correctly I need it now