Which of the following pairs are incorrect?
I.Chloroflurocarbons-Refrigerators
II.Methane-Ploughing of fields
III.Nitrous oxide-Enteric fermentation in cows
IV. Carbon dioxide-Burning of fossil fuels

The respiratory quotient of glucose in anaerobic respiration is

The value of e° is

How many solutions have a linear equation in one variable?

The 7th term of the sequence 0.12, 0.012, 0.0012 ...... is

Simplify:
$\dfrac{9}{8}\div\dfrac{3}{5}of(\dfrac{3}{4}+\dfrac{3}{5})$

A sum of money triples itself at 8% per annum over a certain time. The time taken is

Find the correct relationship between G.C.D. and L.C.M.
I.G.C.D. = L.C.M.
II.G.C.D. $\leq$ L.C.M.
III. L.C.M.$\leq$ G.C.D.
IV. L.C.M. > G.C.D.

If p, q, r; s, t are in A.P, then the value of p- 4q +6r- 4s +t is

The G.C.D. and L.C.M. of 90, 150, 225 is