Brass is an alloy of ?
A. Copper and Zinc
B. Copper and Tin
C. Copper and Lead
D. None of these
Moraines are?
A. Deposits by glaciers
B. Deposits by wind
C. Deposits by river
D. Deposits by sea
Submarine works under the principle of:
A. Archimedes principle
B. Michael Faraday Principle
C. Principle of Pressure
D. None of these
Karachi is most effected by ?
A. Air and water pollution
B. Water pollution only
C. Air pollution only
D. None of these
Study of animal behavior is called?
A. Entomology
B. Etymology
C. Ethology
D. None of these
Which gas quickly destroys the ozone layer:
A. Carbon dioxide
B. Methane
C. Chlorofluorocarbans
D. Nitrous oxide