Question

CHOOSE THE CORRECT OPTION

1. If five waves are produced in one second , then the time period of the wave is :

(a) 0.2 second
(b) 0.25 second
(c) 0.1 second
(d) 0.05 second


2. Which of the following is a good sound absorber :

(a) glass
(b) water
(c) thermocol
(d) vacuum


3. Which of the following concepts is used in SONAR to find the depth of oceans ?

(a) mysical sound
(b) echoes
(c) LASER
(d) noise



4. The speed of the sound in air at 0 degree Celsius is approximately :

(a) 344 m/s
(b) 260 m/s
(c) 330 m/s
(d) 390 m/s



​

Answer 1

1 B

2 C

3 A

4 D

I HOPE THIS HELP

Answer 2

ANSWER :–

( 1 ) 0.2 second

( 2 ) vacuum

( 3 ) echoes

( 4 ) 330 m/s

Hope it helps you ❤️❤️❤️