One of the main function of the earth’s ozone layer is to ?
A. Prevent global warming
B. Filter out ultraviolet rays
C. Absorb pollution
D. All of the above
Basic metals can be converted into gold by ?
A. Heating
B. Beating
C. Artificial nuclear radioactivity
D. Chemical reaction
Human population growth is greatest in developing countries because ?
A. The birth rate is high in developing countries
B. The death rate is high in developing countries.
C. Much of the population has already reached the child bearing age.
D. Most of the world’s population lives in industrialized countries.
Humming bird belongs to a category called ?
A. Ectotherm
B. Endotherm
C. Exotherm
D. Heterotherm.
Copper can be converted into gold by ?
A. Artificial radioactivity
B. Heating
C. Electroplating
D. Chemical reaction
Sheena is a local language of __________ ?
A. Gilgit baltistan
B. Sindh
C. Punjab
D. None of them