What is the minimum distance (in metres) required to hear an echo?
10 m
13 m
17 m
21 m
C.
17 m
Identify the odd term amongst the following groups.
Microwaves
Coaxial cable
Optical fibre
Twisted pair wire
The gas commonly used in advertisement sign-boards and decorative lights is
nitrogen
chlorine
hydrogen
neon
Which of the following is not a component of Smog?
Volatile Organic Compounds
Nitrogen Oxide
Sulphur Dioxide
Chlorine Oxide
Pick out the correct match.
Milk - Fibre and minerals
Egg Yolk - Protein and fat
Fleshy foods - Calcium and protein
Fish - Starch and vitamin
Combustion is a
physical and chemical process
biological process
physical process
chemical process
What is Dry Ice?
Solid carbon dioxide
Liquid nitrogen
Ice cubes and saw dust
Ice cubes and salt