National Science Olympiad Class 5 (With CD)

The answer in the book is C. This is just an example, but there are many incorrect answer keys.

Excellent book....must recommend for NSOAspirants to study.... don't listen to the 1 stars raters...

I learned a lot it is pretty amazing

Same Questions came in exam

Not a Great book. You still have to depend a lot on supplementary material to prepare properly