The green house effect is caused by an excess of a

14. The Green House Effect is caused by an excess of
A. carbon dioxide
B. carbon monoxide
C. carbon tetrachloride
D. none of above
Answer is = A
15. Bats can also fly in dark because they are capable of taking the help of 16. What is ‘Stealth technology’? 17. The primary function or the feathers in birds is to 18. The rear view mirror of a motor vehicle is
A. concave
B. plane
C. convex