Question

1. Non biodegradable material among the following is_____
a) Food
b) Paper
c) Plastic
d) All the above

2. Sounds of frequency less than the audible range is ____
a) Infrasonics
b) Ultrasonics
c) Supersonics
d) None of the above

3.Example for liquid metal is ______
a) Sodium
b) Nitrogen
c) Water
d) Mercury​

Answer 1

Answer:

1. Plastic

2. infrasound

3. mercury