2nd Year Chemistry Second half Book Paper

Q1. Multiple choice questions (Attempt all · 17 × 1 = 17)

1. Cosmetics are mixtures of:
   1. Organic compounds only
   2. Only hydrocarbons
   3. Minerals only
   4. Natural and synthetic chemicals
2. Optimum temperature for human enzymes is about:
   1. 0°C
   2. 25°C
   3. 37°C
   4. 60°C
3. Hydrolysis of condensed polymers can occur under:
   1. Neutral only
   2. Acidic or basic
   3. Enzymatic only
   4. High pressure only
4. Which compound contributes to inflammation, pain, and fever?
   1. Prostaglandins
   2. Lipids
   3. Hormones
   4. Dopamine
5. Spectroscopy is based on the interaction of atoms or molecules with:
   1. Heat
   2. Sound waves
   3. Electromagnetic radiations
   4. Chemical reactions
6. Shorter retention times are associated with:
   1. Polar components with lower boiling points
   2. Non-polar components with high boiling points
   3. Metals
   4. Solvent molecules only
7. Fertilizers increase the natural fertility of the soil or:
   1. Replace lost water
   2. Add pesticides
   3. Increase soil acidity
   4. Replace elements
8. Two peaks in the chlorine mass spectrum show that:
   1. Chlorine has one isotope
   2. Chlorine has two isotopes
   3. Chlorine is monoisotopic
   4. Chlorine is a mixture with hydrogen
9. The abundance of M+1 peak depends mainly on:
   1. Hydrogen atoms
   2. Oxygen atoms
   3. Carbon atoms
   4. Nitrogen atoms
10. Which of the following is one of the strongest materials known?
    1. Silver
    2. Graphene
    3. Diamond
    4. Plastic
11. Which database was used to screen molecules when discovering Halicin?
    1. PubChem
    2. DrugBank
    3. ZINC15
    4. ChemSpider
12. Why can long-term use of opiates lead to addiction?
    1. Because they inhibit serotonin reuptake
    2. ecause they cause irreversible binding to receptors
    3. ecause they increase dopamine release in the brain
    4. Because they decrease the production of natural endorphins
13. Fructose is classified as:
    1. Aldohexose
    2. Ketohexose
    3. Aldopentose
    4. Ketopentose
14. Which of the following is a polyester?
    1. Kevlar
    2. Nylon-6,6
    3. Terylene
    4. PVC
15. Which enzyme functions optimally in the acidic environment of the stomach?
    1. Amylase
    2. Trypsin
    3. Pepsin
    4. Lipase
16. The property that makes nuclei NMR active is called:
    1. Isotopic mass
    2. Spin
    3. Charge density
    4. Energy difference
17. The stationary phase in chromatography functions mainly as:
    1. A solvent
    2. An adsorbent
    3. A lubricant
    4. A catalyst