Typhoid and cholera are typical examples of____.
A. Infectious diseases
B. Air-borne disease
C. Water-borne disease
D. None of these
Match the following
Column I Column II
A. Beriberi 1. Vitamin A
B. Scurvy 2. Vitamin B
C. Rickets 3. Vitamin C
D. Night Blindness 4. Vitamin D
Short-sightedness can be corrected by using_____.
A. Convex lens
B. Concave lens
C. Convex-concave lens
D. Concave-convex lens
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