1. Which of these is considered a neutral substance?
A)Vinegar
B)Pure water
C)Soap
D)Lemon juice
2. What do bases taste like?
A)Sweet
B)Sour
C)Bitter
D)Salty
3. Which substance has a pH lower than 7?
A)Orange juice
B)Sea water
C)Baking soda
D)Bleach
4. What is the pH of a strong base?
5. Which household item is acidic?
A)Vinegar
B)Glass cleaner
C)Drain cleaner
D)Baking soda
6. What does pH stand for?
A)Pressure of hydrogen
B)Power of hydrogen
C)Percentage of hydration
D)Potential of heat
7. Which substance is alkaline?
A)Coffee
B)Stomach acid
C)Lemon juice
D)Baking soda
8. Which liquid is most acidic?
A)Soap
B)Milk
C)Stomach acid
D)Blood
9. What is used to measure the pH of a solution?
A)Litmus paper
B)Scale
C)Barometer
D)Thermometer
10. What is the main purpose of food preservatives?
A)Change the color
B)Extend shelf life
C)Increase weight
D)Add flavor
11. Which of these is a common natural food coloring?
A)Gold
B)Beet juice
C)Plastic
D)Nylon
12. What do antioxidants prevent in food?
A)Boiling
B)Freezing
C)Oxidation
D)Melting
13. Which substance is commonly used to sweeten food?
A)Oxygen
B)Iron
C)Copper
D)Sucrose
14. What is added to food to improve texture?
A)Gas
B)Thickeners
C)Acid
D)Metals
15. Which acid is often used as a preservative in soft drinks?
A)Gold acid
B)Lead acid
C)Citric acid
D)Iron acid
16. What do emulsifiers do in processed food?
A)Mix oil and water
B)Remove color
C)Increase heat
D)Make it spicy
17. Which of these is a common flavor enhancer?
A)MSG
B)Rubber
C)Plastic
D)Lead
18. Why are food dyes added to products?
A)Add vitamins
B)Kill bacteria
C)Enhance appearance
D)Increase price
19. What type of additive prevents clumping?
A)Dye
B)Sweetener
C)Anti-caking agent
D)Preservative
20. Which chemical is often used as a salt preservative?
A)Neon
B)Argon
C)Sodium chloride
D)Gold
21. What is the role of a stabilizer in food?
A)Remove water
B)Increase weight
C)Change color
D)Maintain consistency
22. Which ingredient is commonly used to give food a yellow color?
A)Iron
B)Copper
C)Lead
D)Turmeric
23. What are E-numbers used for in food labels?
A)Identify additives
B)Weight info
C)Price code
D)Batch date
24. What does a humectant do in food products?
A)Add color
B)Retain moisture
C)Kill bacteria
D)Improve scent
25. What is the most abundant element in the universe?
A)Carbon
B)Oxygen
C)Hydrogen
D)Helium
26. Which element makes up the second largest portion of the universe?
A)Iron
B)Helium
C)Nitrogen
D)Oxygen
27. What is the most abundant element in Earth's crust?
A)Aluminum
B)Oxygen
C)Iron
D)Silicon
28. Which element is the second most common in Earth's crust?
A)Gold
B)Hydrogen
C)Carbon
D)Silicon
29. Which element is the most abundant in Earth's atmosphere?
A)Argon
B)Oxygen
C)Nitrogen
D)Carbon Dioxide
30. What metal is the most abundant in Earth's crust?
A)Silver
B)Aluminum
C)Gold
D)Copper
31. Which element is commonly believed to form the Earth's core?
A)Calcium
B)Lead
C)Magnesium
D)Iron
32. In the human body, which element is the most abundant by mass?
A)Oxygen
B)Hydrogen
C)Carbon
D)Nitrogen
33. Which gas is the second most abundant in our atmosphere?
A)Methane
B)Oxygen
C)Helium
D)Nitrogen
34. Which element is the primary component of organic life?
A)Oxygen
B)Carbon
C)Sulfur
D)Silicon
35. What is the third most abundant element in the universe?
A)Nitrogen
B)Carbon
C)Neon
D)Oxygen
36. Which element is highly abundant in Earth's oceans?
A)Gold
B)Iron
C)Mercury
D)Chlorine
37. Which element is essential for bone structure and is common in the crust?
A)Potassium
B)Sodium
C)Zinc
D)Calcium
38. Which element is the most abundant noble gas in the atmosphere?
A)Krypton
B)Argon
C)Helium
D)Neon
39. Which element makes up the bulk of the Sun's mass?
A)Iron
B)Oxygen
C)Hydrogen
D)Carbon
40. What is the primary purpose of adding chlorine to drinking water?
A)To remove lead
B)To add flavor
C)To soften water
D)To kill pathogens
Answer Key
1-B
2-C
3-A
4-A
5-A
6-B
7-D
8-C
9-A
10-B
11-B
12-C
13-D
14-B
15-C
16-A
17-A
18-C
19-C
20-C
21-D
22-D
23-A
24-B
25-C
26-B
27-B
28-D
29-C
30-B
31-D
32-A
33-B
34-B
35-C
36-D
37-D
38-B
39-C
40-D