A. Convex
B. Concave
C. Diverging
D. None of these

A. Surface tension
B. Low air pressure
C. Air resistance
D. Viscosity of water

A. Carbondioxide
B. Carbon monoxide
C. Nitrogen
D. Hydrogen sulfide

A. Speed
B. Temperature
C. Mass
D. Velocity

A. Protons
B. Electrons
C. Neutrons
D. Positrons

A. Radioactivity
B. Theory of Relativity
C. Rocket Propulsion
D. Quantum Theory

A. Gold
B. Aluminium
C. Mercury
D. Platinum

A. Gravity
B. Volcano
C. Earthquake
D. Tsunami

A. Battery
B. Generato
C. Television
D. UPS

A. Air
B. Sand
C. Vacuum
D. Water