2nd Year Chemistry Chapter 23 Test23. Industry

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Cosmetics are mixtures of:
   1. Organic compounds only
   2. Only hydrocarbons
   3. Minerals only
   4. Natural and synthetic chemicals
2. 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
3. The percentage of gypsum in cement is about:
   1. 2–3%
   2. 0.1
   3. 0.2
   4. 0.5
4. The chemical industry is considered the ultimate fruit of:
   1. Physics
   2. Mathematics
   3. Chemical research
   4. Biology
5. The open trucking of cement instead of packing is based on:
   1. Worker availability
   2. Consumer demand
   3. Company rules
   4. Climate conditions
6. What is a major challenge in developing broad-spectrum antiviral drugs?
   1. Lack of selectivity
   2. High mutation rate of viruses
   3. Limited understanding of viral replication
   4. Inability to target host cells
7. What is the significance of maintaining an acidic pH in the stomach for digestion?
   1. Enhances the absorption of lipids
   2. Facilitates the activation of digestive enzymes
   3. Promotes the breakdown of carbohydrates
   4. Increases the secretion of bile
8. If a drug’s concentration in the bloodstream falls below the MEC, what is the most likely outcome?
   1. The patient will experience toxicity
   2. The drug will have no therapeutic effect
   3. The patient will experience severe side effects
   4. The drug will be at its maximum effectiveness
9. Food packaging is important because it:
   1. Adds preservatives
   2. Avoids biological and chemical attacks
   3. Removes odour
   4. Adds colour to food
10. Which mineral raw material is obtained from the lithosphere?
    1. Sulphates and bromides
    2. Biogas
    3. Aluminium and iron ores
    4. Starch and cellulose