The beautiful color patterns exhibited by a peacock in its tail feathers are due to ?
A. Selective absorption of light
B. Selective re ection of light
C. Sinterference of light
D. Natural colour pattern of feathers
Dolly is the name of the ?
A. First cloned sheep
B. First cloned monkey
C. First test-tube baby
D. First human fossil
The most important stimulant in tea leaves is?
A. Brucine
B. Caffeine
C. Phenylalanine
D. Theine
Dialysis is used for the treatment of__________?
A. Kidney failure
B. Heart weakness
C. Brain diseases
D. None of these
Short-sightedness can be corrected by using ___________?
A. Convex lens
B. Concave lens
C. Convex-concave lens
D. Concave-convex lens