Question

read each question. circle the letter of the best answer. of back of you
1 when sound waves hit a large solid object, they often ____.
a stop b change c spread out d bounce back
2 the main idea of the last paragraph is to tell ____.
a why you don’t hear all echoes c what materials don’t make echoes
b why sound waves move quickly d how echoes move through tunnels
3 suppose you shouted in a small room that has carpet on the floor. you can tell from the story that you would probably hear ____.
a one echo c many echoes
b no echoes d nothing at all
4 when there is an echo, what happens last?
a sound waves hit a large solid object.
b sound waves bounce back at you.
c you hear a repeated sound.
d you give a loud shout.

Explanation:

Question 1

Sound waves hitting a large solid object typically reflect (bounce back) rather than stop, change (vague), or spread out. Echoes form from bouncing back.

The last paragraph likely explains why not all echoes are heard (e.g., absorption, distance). Option B is about speed (not main idea), C about non - echo materials (unlikely), D about tunnels (narrow focus). So A fits.

Carpet absorbs sound, reducing echo formation. So in a carpeted small room, you’d probably hear no echoes. One/many echoes need reflective surfaces; “nothing at all” is incorrect as sound is made.

Answer:

D. bounce back

Question 2