781. Magnitude of energy released by an earthquake is calculated using ________?
A. Earthquake scale
B. Seismic scale
C. Richter scale
D. Temblor scale

782. The point within the Earth where earthquakes originate is _________?
A. Comma
B. Origin
C. Epicenter
D. Focus

783. Place directly above focus on Earth’s surface is known as _________?
A. Strike
B. Comma
C. Epicenter
D. Origin

784. In general, the most destructive earthquake waves are the __________ ?
A. P waves
B. S waves
C. Surface waves
D. All of the above

785. Study of Soil is called__________?
A. Pedology
B. Pedagogy
C. sociology
D. Demography

786. The type of glass used in making lenses and prism is___________?
A. Pyrex glass
B. jena glass
C. Flintglass
D. Soft glass

787. What “Enrico Fermi” invented?
A. X ray machine
B. Betatron
C. Cyclotron
D. Nuclear reactor

788. The metal, which is a constituent of vitamin B12 is____________?
A. Iron
B. Magnesium
C. Zinc
D. Cobalt

789. Tetanus is caused by____________?
A. Clostridium
B. Virus
C. Bacteriophage
D. Salmonella

790. The carbon dioxide content in the air that we exhale is about?
A. 4%
B. 9%
C. 15%
D. 16%