26. Wine is obtained after alcoholic fermentation of

A. rice
B. wheat
C. grapes
D. barley

27. After storage and recarbonation, leftover yeast is separated by

A. centrifugation
B. filtration
C. cell disruption
D. need not to be separated

28. Sodium or potassium meta bisulfate is added to crushed grapes to

A. enhance the flavoring compound
B. check the undesirable organisms
C. maintain pH
D. all of the above

29. A hydrometer

A. measures wine acid
B. requires a few drops of juice
C. measures alcohol in the wine
D. measures grape sugar

30. Punching down is done

A. for the same reasons as pumping over
B. to extract tannin
C. both (a) and (b)
D.  to keep the cap dry