A. inhaling of air
B. breathing
C. the obtaining of energy as a result of chemical changes within the organism
D. None of above

A. A
B. B1
C. B2
D. D

A. Fusion of heavy nuclei
B. Fusion of light nuclei
C. Chemical reaction
D. Fission of heavy nuclei

A. Wavelength of noise
B. A musical instrument
C. A measure of sound level
D. None of above

A. heat is a form of work
B. plants grow by the heat of the sun.
C. growing of plants in the absence of earth is possible
D. the ultimate source of heat on earth is the earthquakes

A. towards his left hand
B. towards his right hand
C. forward
D. backward

A. centrifugal force
C. cohesive force
B. centripetal force
D. dsintegrating force

A. preserving the skins of animals
B. taxi driving
C. neutralizing effects of toxins on skin
D. reading body reactions to climatic changes

A. sound
B. air navigation
C. statical electricity
D. gases in motion

A. breaks out over an extensive area in an infectious manner
B. is prevalent among the poor people due to insanitary conditions
C. occurs as a regular-feature
D. occurs as a result of floods and droughts