Aptitude- Mechanical- Acoustics & Optics

A ✘ B ✘ Equal ✘

Ice cream truck 1's sound will go up and down, while ice cream truck 2's sound will be normal. ✘ Ice cream truck 2's sound will go up and down, while ice cream truck 1's sound will be normal. ✘ The sound of both ice cream trucks will be normal. ✘

A ✘ B ✘

Air ✘ Compressed air ✘ Water ✘ Vacuum ✔

It can be seen and heard ✘ It can only be seen ✘ It can only be heard ✘ It cannot be seen nor heard ✔

A ✘ B ✘

y > x ✘ y < x ✘ y = x ✘ Can't tell ✔

1 ✘ 2 ✘ 3 ✘

The same but upside down ✘ Straight but smaller ✘ Straight but larger ✘

Convex ✘ Concave ✘ Plane ✘