21. What is the most abundant gas in the atmosphere of the earth?
- a) Oxygen
- b) Nitrogen
- c) Carbon Dioxide
- d) Argon
22. The pH of pure water is:
- a) 5
- b) 6
- c) 7
- d) 8
23. What metal is liquid at a room temperature?
- a) Iron
- b) Copper
- c) Mercury
- d) Silver
24. This is the most difficult natural material that occurs on the Earth:
- a) Iron
- b) Diamond
- c) Gold
- d) Platinum
25. What gas do plants produce in photosynthesis?
- a) Carbon Dioxide
- b) Oxygen
- c) Nitrogen
- d) Hydrogen
26. What gases are released into atmosphere causing acid rain?
- a) Oxygen and Nitrogen
- b) Sulfur Dioxide and Nitrogen Oxides.
- c) Carbon Monoxide and Oxygen
- d) Hydrogen and Helium
27. Malaria is caused by:
- a) Virus
- b) Plasmodium (Parasite)
- c) Bacteria
- d) Fungus
28. Goiter is associated with the deficiency of:
- a) Calcium
- b) Iodine
- c) Iron
- d) Sodium
29. What disease results through Iron deficiency?
- a) Scurvy
- b) Rickets
- c) Anemia
- d) Beri-Beri
30. Dengue fever is caused by:
- a) House Fly
- b) Aedes Mosquito
- c) Anopheles Mosquito
- d) Sand Fly
31. AIDS is caused by:
- a) HIV (Virus)
- b) Bacteria
- c) Fungus
- d) Protozoa
32. Deficiency of:
- a) Vitamin A
- b) Vitamin B1 (Thiamine)
- c) Vitamin C
- d) Vitamin D
33. The SI unit of electric current is:
- a) Volt
- b) Ohm
- c) Ampere
- d) Watt
34. What is the Lens used to correct short-sightedness (Myopia)?
- a) Convex Lens
- b) Concave Lens
- c) Bifocal Lens
- d) Cylindrical Lens
35. The quickest way of heat transfer is:
- a) Conduction
- b) Convection
- c) Radiation
- d) Insulation
36. What is the unit of frequency?
- a) Meter
- b) Second
- c) Hertz
- d) Joule
37. The most compact planet in our solar system is:
- a) Jupiter
- b) Mars
- c) Earth
- d) Saturn
38. The rear field of view mirror found in cars is a:
- a) Plane Mirror
- b) Convex Mirror
- c) Concave Mirror
- d) Spherical Mirror
39. What kind of waves are these sound waves?
- a) Transverse Waves
- b) Longitudinal Waves
- c) Electromagnetic Waves
- d) Matter Waves
40. The dissection of white light into its individual colors is known as:
- a) Reflection
- b) Refraction
- c) Dispersion
- d) Diffraction
