Cardiac output is determined by which of the following?

An organ pipe $P_1$ closed at one end is vibrating in its first overtone. Another pipe $P_2$ open at both ends is vibrating in its third overtone. They are in resonance with a given tuning fork. The ratio of the length of $P_1$ to that of $P_2$ is:

$A$ coin and a six-faced die,both unbiased,are thrown simultaneously. The probability of getting a head on the coin and an odd number on the die is:

Which vegetable crop,released by $IARI$ New Delhi,is enriched with Vitamin $C$?

Which enzyme is responsible for the conversion of glucose into ethanol?

Which one of the following symbols and its representation,used in human pedigree analysis is correct?