Question
Which of the following statements is true about
sound? ÂSolution
Sound is a mechanical wave, so it needs a medium like air, water, or solids.  It cannot travel in vacuum (like in space).  This is why no sound can be heard in outer space.  Reflection of sound is used in SONAR and echo.
3, 8, 27, 124, ?
What value should come in the place of (?) in the following number series?
54, 81, 135, 216, 324, ?
18, 37, 60, ?, 120, 157
70, 69, 73, 64,80, 55, ?
97, 75, 108, 64, ?, 53
What will come in place of the question mark (?) in the following series?
15, 90, 450, ?, 5400, 10800Â
What will come in place of the question mark (?) in the following series?
?, 65, 37, 73, 29, 81
Find the missing number in the given number series.
2, 5, 11, 23, 47, ?250, 279, 311, 349, 396, ?
What will come in place of the question mark (?) in the following series?
40, 25, 30, 50, 105, ?
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