{"id":12800,"date":"2025-09-23T06:37:33","date_gmt":"2025-09-23T05:37:33","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=12800"},"modified":"2025-10-22T10:32:24","modified_gmt":"2025-10-22T09:32:24","slug":"drugs-and-chemicals-top-100-mcqs-with-answer-and-explanation","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/09\/23\/drugs-and-chemicals-top-100-mcqs-with-answer-and-explanation\/","title":{"rendered":"Drugs and chemicals Top 100 MCQs With Answer and Explanation"},"content":{"rendered":"\n

1. Drugs are chemical substances used for:
<\/mark><\/strong>a) Entertainment only
b) Diagnosis, prevention, and treatment of diseases
c) Increasing soil fertility
d) Fuel production
Answer:<\/strong> b) Diagnosis, prevention, and treatment of diseases
Explanation:<\/strong> A drug is a chemical that alters biological functions to prevent or cure diseases.<\/p>\n\n\n\n

2. Aspirin is commonly used as a:
<\/mark><\/strong>a) Antipyretic and analgesic
b) Antibiotic
c) Antacid
d) Antiseptic
Answer:<\/strong> a) Antipyretic and analgesic
Explanation:<\/strong> Aspirin reduces fever, relieves pain, and inflammation.<\/p>\n\n\n\n

3. The chemical name of aspirin is:<\/mark><\/strong>
a) Acetylsalicylic acid
b) Paracetamol
c) Ibuprofen
d) Phenacetin
Answer:<\/strong> a) Acetylsalicylic acid
Explanation:<\/strong> Aspirin = acetyl derivative of salicylic acid.<\/p>\n\n\n\n

4. Paracetamol is widely used as a:<\/mark><\/strong>
a) Sedative
b) Antipyretic
c) Antibiotic
d) Antihistamine
Answer:<\/strong> b) Antipyretic
Explanation:<\/strong> Paracetamol lowers fever and relieves mild pain.<\/p>\n\n\n\n

5. Which drug is called \u201cmagic bullet\u201d (first effective antibiotic)?<\/mark><\/strong>
a) Aspirin
b) Penicillin
c) Sulpha drug
d) Quinine
Answer:<\/strong> b) Penicillin
Explanation:<\/strong> Discovered by Alexander Fleming (1928), penicillin was the first antibiotic.<\/p>\n\n\n\n

6. The first synthetic drug was:<\/mark><\/strong>
a) Aspirin
b) Chloral hydrate
c) Barbituric acid
d) Sulphanilamide
Answer:<\/strong> d) Sulphanilamide
Explanation:<\/strong> Sulpha drugs were the first synthetic antimicrobial agents.<\/p>\n\n\n\n

7. Morphine is obtained from:<\/mark><\/strong>
a) Coffee plant
b) Poppy plant
c) Cinchona tree
d) Tobacco
Answer:<\/strong> b) Poppy plant
Explanation:<\/strong> Morphine is an alkaloid extracted from opium poppy, used as a strong painkiller.<\/p>\n\n\n\n

8. Quinine is used for the treatment of:
<\/mark><\/strong>a) Typhoid
b) Malaria
c) Tuberculosis
d) Diabetes
Answer:<\/strong> b) Malaria
Explanation:<\/strong> Quinine from cinchona bark is an anti-malarial drug.<\/p>\n\n\n\n

9. Antibiotics are substances that:<\/mark><\/strong>
a) Increase appetite
b) Kill or inhibit growth of microorganisms
c) Improve memory
d) Act as vitamins
Answer:<\/strong> b) Kill or inhibit growth of microorganisms
Explanation:<\/strong> Antibiotics (e.g., penicillin, streptomycin) are used against bacteria.<\/p>\n\n\n\n

10. The first sulpha drug was:<\/mark><\/strong>
a) Sulphanilamide
b) Prontosil
c) Sulphadiazine
d) Sulphathiazole
Answer:<\/strong> b) Prontosil
Explanation:<\/strong> Prontosil was the first sulpha drug discovered by Domagk (1932).<\/p>\n\n\n\n

11. Antacids are used to treat:<\/mark><\/strong>
a) Headache
b) Stomach acidity
c) Infections
d) Fever
Answer:<\/strong> b) Stomach acidity
Explanation:<\/strong> Antacids neutralize excess HCl in stomach (e.g., Mg(OH)\u2082, Al(OH)\u2083).<\/p>\n\n\n\n

12. Which of the following is an antacid?<\/mark><\/strong>
a) Sodium bicarbonate
b) Magnesium hydroxide
c) Aluminium hydroxide
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> All neutralize stomach acidity.<\/p>\n\n\n\n

13. Antihistamines are drugs that:<\/mark><\/strong>
a) Kill bacteria
b) Prevent allergic reactions
c) Kill viruses
d) Work as analgesics
Answer:<\/strong> b) Prevent allergic reactions
Explanation:<\/strong> Antihistamines (e.g., cetirizine, diphenhydramine) block histamine receptors.<\/p>\n\n\n\n

14. Which chemical is used as a disinfectant in drinking water?<\/mark><\/strong>
a) Ozone
b) Chlorine
c) Potassium permanganate
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> O\u2083, Cl\u2082, and KMnO\u2084 are used in different concentrations for water purification.<\/p>\n\n\n\n

15. Dettol contains:<\/mark><\/strong>
a) Chloroxylenol + alcohol
b) Phenol + alcohol
c) Chloroform + spirit
d) Tincture iodine
Answer:<\/strong> a) Chloroxylenol + alcohol
Explanation:<\/strong> Dettol is an antiseptic liquid commonly used for wounds.<\/p>\n\n\n\n

16. Tincture of iodine contains iodine in:<\/mark><\/strong>
a) Water
b) Alcohol
c) Ether
d) Chloroform
Answer:<\/strong> b) Alcohol
Explanation:<\/strong> Tincture iodine is a solution of I\u2082 in alcohol used as antiseptic.<\/p>\n\n\n\n

17. Disinfectants are chemicals used for:<\/mark><\/strong>
a) Living tissues
b) Non-living surfaces
c) Both
d) None
Answer:<\/strong> b) Non-living surfaces
Explanation:<\/strong> Disinfectants are applied to floors, walls, instruments.<\/p>\n\n\n\n

18. Antiseptics are chemicals applied to:<\/mark><\/strong>
a) Soil
b) Living tissues
c) Metals
d) Food
Answer:<\/strong> b) Living tissues
Explanation:<\/strong> Antiseptics are safe for wounds, skin, and mucous membranes.<\/p>\n\n\n\n

19. Which chemical is used in soaps and detergents as disinfectant?<\/mark><\/strong>
a) Phenol
b) Chloroxylenol
c) Triclosan
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Phenolic compounds have germicidal properties.<\/p>\n\n\n\n

20. Which compound is used as a preservative in pickles?<\/mark><\/strong>
a) Sodium chloride
b) Vinegar (acetic acid)
c) Sodium benzoate
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> All are preservatives preventing microbial growth.<\/p>\n\n\n\n

21. The drug used to lower blood pressure is:<\/mark><\/strong>
a) Atenolol
b) Paracetamol
c) Aspirin
d) Insulin
Answer:<\/strong> a) Atenolol
Explanation:<\/strong> Atenolol is a beta-blocker that reduces blood pressure.<\/p>\n\n\n\n

22. Insulin is used for treatment of:<\/mark><\/strong>
a) Hypertension
b) Tuberculosis
c) Diabetes mellitus
d) Malaria
Answer:<\/strong> c) Diabetes mellitus
Explanation:<\/strong> Insulin regulates blood glucose levels.<\/p>\n\n\n\n

23. Which chemical is used as a preservative in soft drinks?<\/mark>
<\/strong>a) Sodium benzoate
b) Potassium nitrate
c) Calcium sulphate
d) Sulphur dioxide
Answer:<\/strong> a) Sodium benzoate
Explanation:<\/strong> It prevents microbial spoilage of drinks.<\/p>\n\n\n\n

24. Formalin is a solution of:<\/mark><\/strong>
a) Formaldehyde in water
b) Acetaldehyde in water
c) Methanol in water
d) Acetone in water
Answer:<\/strong> a) Formaldehyde in water
Explanation:<\/strong> Formalin (40% formaldehyde) is used as a preservative and disinfectant.<\/p>\n\n\n\n

25. Which chemical is commonly used as a bleaching agent and disinfectant?<\/mark><\/strong>
a) Sodium chloride
b) Sodium hypochlorite
c) Sodium sulphate
d) Potassium iodide
Answer:<\/strong> b) Sodium hypochlorite
Explanation:<\/strong> NaOCl (household bleach) is used for cleaning and disinfection.<\/p>\n\n\n\n

26. Which of the following is a mild analgesic?<\/mark><\/strong>
a) Morphine
b) Paracetamol
c) Codeine
d) Aspirin
Answer:<\/strong> b) Paracetamol
Explanation:<\/strong> Paracetamol relieves mild pain and fever, while morphine\/codeine are strong narcotics.<\/p>\n\n\n\n

27. Morphine belongs to which class of drugs?<\/mark><\/strong>
a) Antipyretics
b) Narcotic analgesics
c) Antacids
d) Antihistamines
Answer:<\/strong> b) Narcotic analgesics
Explanation:<\/strong> Morphine is a strong painkiller from opium (narcotic).<\/p>\n\n\n\n

28. Codeine is mainly used as:<\/mark><\/strong>
a) Pain reliever
b) Cough suppressant
c) Antibiotic
d) Antacid
Answer:<\/strong> b) Cough suppressant
Explanation:<\/strong> Codeine is used in cough syrups for dry cough.<\/p>\n\n\n\n

29. Ibuprofen is used as:<\/mark><\/strong>
a) Antiseptic
b) Antipyretic and anti-inflammatory
c) Antibiotic
d) Antacid
Answer:<\/strong> b) Antipyretic and anti-inflammatory
Explanation:<\/strong> Ibuprofen reduces fever, pain, and inflammation.<\/p>\n\n\n\n

30. Which of the following is not an analgesic?<\/mark><\/strong>
a) Aspirin
b) Paracetamol
c) Morphine
d) Penicillin
Answer:<\/strong> d) Penicillin
Explanation:<\/strong> Penicillin is an antibiotic, not an analgesic.<\/p>\n\n\n\n

31. Aspirin works by inhibiting:<\/mark><\/strong>
a) Histamine
b) Prostaglandin synthesis
c) Insulin secretion
d) Bacterial growth
Answer:<\/strong> b) Prostaglandin synthesis
Explanation:<\/strong> Prostaglandins cause pain and inflammation; aspirin blocks them.<\/p>\n\n\n\n

32. Overdose of paracetamol mainly affects:<\/mark><\/strong>
a) Heart
b) Liver
c) Kidney
d) Lungs
Answer:<\/strong> b) Liver
Explanation:<\/strong> Paracetamol overdose causes liver damage.<\/p>\n\n\n\n

33. Which of the following is a strong antibiotic?<\/mark><\/strong>
a) Penicillin
b) Paracetamol
c) Aspirin
d) Morphine
Answer:<\/strong> a) Penicillin
Explanation:<\/strong> Penicillin is the first antibiotic, effective against bacteria.<\/p>\n\n\n\n

34. Streptomycin is mainly used for treating:<\/mark><\/strong>
a) Malaria
b) Tuberculosis
c) Cancer
d) Diabetes
Answer:<\/strong> b) Tuberculosis
Explanation:<\/strong> Streptomycin is an antibiotic effective against TB bacteria.<\/p>\n\n\n\n

35. Chloramphenicol is used to treat:<\/mark><\/strong>
a) Typhoid fever
b) Diabetes
c) Malaria
d) Hypertension
Answer:<\/strong> a) Typhoid fever
Explanation:<\/strong> Chloramphenicol is an antibiotic effective against Salmonella typhi.<\/p>\n\n\n\n

36. Tetracycline group of antibiotics is obtained from:<\/mark><\/strong>
a) Penicillium fungus
b) Streptomyces bacteria
c) Cyanobacteria
d) Yeast
Answer:<\/strong> b) Streptomyces bacteria
Explanation:<\/strong> Tetracyclines are broad-spectrum antibiotics from Streptomyces.<\/p>\n\n\n\n

37. Which antibiotic is used to treat syphilis?<\/mark><\/strong>
a) Penicillin
b) Tetracycline
c) Chloramphenicol
d) Rifampicin
Answer:<\/strong> a) Penicillin
Explanation:<\/strong> Penicillin is highly effective against syphilis (Treponema pallidum).<\/p>\n\n\n\n

38. Which drug is used in combination therapy for TB?<\/mark><\/strong>
a) Rifampicin
b) Isoniazid
c) Pyrazinamide
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> TB is treated with a combination of antibiotics to prevent resistance.<\/p>\n\n\n\n

39. Which drug is called the \u201cwonder drug\u201d?<\/mark><\/strong>
a) Morphine
b) Penicillin
c) Aspirin
d) Insulin
Answer:<\/strong> b) Penicillin
Explanation:<\/strong> Penicillin saved millions of lives during World War II \u2192 \u201cwonder drug.\u201d<\/p>\n\n\n\n

40. Which antibiotic is effective against both Gram-positive and Gram-negative bacteria?<\/mark><\/strong>
a) Broad-spectrum antibiotics
b) Narrow-spectrum antibiotics
c) Antipyretics
d) Antiseptics
Answer:<\/strong> a) Broad-spectrum antibiotics
Explanation:<\/strong> Broad-spectrum (e.g., tetracycline) target many bacterial types.<\/p>\n\n\n\n

41. Which of the following is a sulpha drug?<\/mark><\/strong>
a) Sulphanilamide
b) Streptomycin
c) Rifampicin
d) Ampicillin
Answer:<\/strong> a) Sulphanilamide
Explanation:<\/strong> Sulpha drugs are synthetic antimicrobial agents.<\/p>\n\n\n\n

42. The main side effect of antibiotics is:<\/mark><\/strong>
a) Hair loss
b) Antibiotic resistance
c) Obesity
d) Diabetes
Answer:<\/strong> b) Antibiotic resistance
Explanation:<\/strong> Overuse\/misuse of antibiotics leads to resistant bacteria.<\/p>\n\n\n\n

43. Antiseptics differ from disinfectants in that they:<\/mark><\/strong>
a) Are more toxic
b) Are applied on living tissues
c) Kill bacteria faster
d) Cannot be used on wounds
Answer:<\/strong> b) Are applied on living tissues
Explanation:<\/strong> Antiseptics are safe for skin\/wounds; disinfectants are for non-living objects.<\/p>\n\n\n\n

44. Which of the following is an antiseptic?<\/mark><\/strong>
a) Dettol
b) Tincture iodine
c) Boric acid
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> All are commonly used antiseptics.<\/p>\n\n\n\n

45. Boric acid is commonly used as an antiseptic for:<\/mark><\/strong>
a) Eye wash
b) Mouth ulcers
c) Wound dressing
d) Ear infections
Answer:<\/strong> a) Eye wash
Explanation:<\/strong> Dilute boric acid is safe for eyes.<\/p>\n\n\n\n

46. Which compound is commonly used as antiseptic in mouthwashes?<\/mark><\/strong>
a) Sodium chloride
b) Phenol
c) Thymol
d) KMnO\u2084
Answer:<\/strong> c) Thymol
Explanation:<\/strong> Thymol is present in Listerine and similar mouthwashes.<\/p>\n\n\n\n

47. Which antiseptic is used in healing wounds and ulcers?<\/mark><\/strong>
a) Boric acid
b) Iodoform
c) Potassium permanganate
d) Formalin
Answer:<\/strong> b) Iodoform
Explanation:<\/strong> Iodoform powder is applied to wounds as antiseptic.<\/p>\n\n\n\n

48. Potassium permanganate (KMnO\u2084) is used as:<\/mark><\/strong>
a) Disinfectant
b) Antiseptic
c) Oxidizing agent
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> KMnO\u2084 is a strong oxidizer and disinfectant used in medicine.<\/p>\n\n\n\n

49. Phenol was first used as a disinfectant by:<\/mark><\/strong>
a) Louis Pasteur
b) Joseph Lister
c) Alexander Fleming
d) Robert Koch
Answer:<\/strong> b) Joseph Lister
Explanation:<\/strong> In 1867, Joseph Lister introduced phenol as an antiseptic in surgery.<\/p>\n\n\n\n

50. The main difference between bacteriostatic and bactericidal antibiotics is:<\/mark><\/strong>
a) Bacteriostatic kill bacteria; bactericidal inhibit growth
b) Bacteriostatic inhibit growth; bactericidal kill bacteria
c) Both mean the same
d) Bactericidal drugs are antiseptics
Answer:<\/strong> b) Bacteriostatic inhibit growth; bactericidal kill bacteria
Explanation:<\/strong> Examples: tetracycline (bacteriostatic), penicillin (bactericidal).<\/p>\n\n\n\n

51. Antacids are used to:<\/mark><\/strong>
a) Kill bacteria
b) Neutralize excess HCl in stomach
c) Reduce blood sugar
d) Lower blood pressure
Answer:<\/strong> b) Neutralize excess HCl in stomach
Explanation:<\/strong> Antacids like Mg(OH)\u2082, Al(OH)\u2083, and NaHCO\u2083 relieve acidity and ulcers.<\/p>\n\n\n\n

52. Which of the following is a common antacid?<\/mark><\/strong>
a) Sodium bicarbonate
b) Magnesium hydroxide
c) Aluminium hydroxide
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> These neutralize stomach acid effectively.<\/p>\n\n\n\n

53. Ranitidine (Zantac) acts as:<\/mark><\/strong>
a) Antibiotic
b) H\u2082-receptor blocker (anti-histamine for stomach acid)
c) Antipyretic
d) Analgesic
Answer:<\/strong> b) H\u2082-receptor blocker
Explanation:<\/strong> Ranitidine blocks histamine receptors in the stomach \u2192 reduces acid secretion.<\/p>\n\n\n\n

54. Omeprazole is classified as:<\/mark><\/strong>
a) Proton pump inhibitor (PPI)
b) Antibiotic
c) Antiseptic
d) Tranquilizer
Answer:<\/strong> a) Proton pump inhibitor (PPI)
Explanation:<\/strong> Omeprazole reduces gastric acid secretion by inhibiting proton pumps.<\/p>\n\n\n\n

55. Which of the following drugs is used to treat acidity and peptic ulcers?<\/mark><\/strong>
a) Cimetidine
b) Ranitidine
c) Omeprazole
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> All are anti-ulcer drugs acting as antacids or acid inhibitors.<\/p>\n\n\n\n

56. Antihistamines act by:<\/mark><\/strong>
a) Blocking histamine receptors
b) Increasing histamine production
c) Destroying histamine directly
d) Stimulating nerve cells
Answer:<\/strong> a) Blocking histamine receptors
Explanation:<\/strong> Antihistamines reduce allergic responses by blocking histamine.<\/p>\n\n\n\n

57. Diphenhydramine (Benadryl) is used as:<\/strong><\/mark>
a) Antipyretic
b) Antihistamine (anti-allergy)
c) Antibiotic
d) Analgesic
Answer:<\/strong> b) Antihistamine
Explanation:<\/strong> Diphenhydramine reduces sneezing, itching, and allergies.<\/p>\n\n\n\n

58. Cetirizine is commonly used to treat:<\/mark><\/strong>
a) Fever
b) Pain
c) Allergies
d) Tuberculosis
Answer:<\/strong> c) Allergies
Explanation:<\/strong> Cetirizine is an antihistamine for allergic rhinitis and skin allergies.<\/p>\n\n\n\n

59. Tranquilizers are drugs that:<\/mark><\/strong>
a) Induce sleep and reduce anxiety
b) Kill bacteria
c) Reduce stomach acidity
d) Kill parasites
Answer:<\/strong> a) Induce sleep and reduce anxiety
Explanation:<\/strong> Tranquilizers affect the central nervous system to calm the mind.<\/p>\n\n\n\n

60. Diazepam (Valium) is used as:<\/mark><\/strong>
a) Antibiotic
b) Tranquilizer (anti-anxiety)
c) Antacid
d) Analgesic
Answer:<\/strong> b) Tranquilizer
Explanation:<\/strong> Diazepam relieves anxiety, insomnia, and muscle spasms.<\/p>\n\n\n\n

61. Barbiturates are a group of:<\/mark><\/strong>
a) Antibiotics
b) Antipyretics
c) Sedatives and hypnotics
d) Antacids
Answer:<\/strong> c) Sedatives and hypnotics
Explanation:<\/strong> Barbiturates depress the central nervous system, inducing sleep.<\/p>\n\n\n\n

62. Which drug is called a \u201csleeping pill\u201d?<\/mark><\/strong>
a) Morphine
b) Diazepam
c) Barbiturates
d) Both b and c
Answer:<\/strong> d) Both b and c
Explanation:<\/strong> Diazepam and barbiturates are used as sleeping pills.<\/p>\n\n\n\n

63. Antifertility drugs are also called:<\/mark><\/strong>
a) Antibiotics
b) Contraceptives
c) Analgesics
d) Antacids
Answer:<\/strong> b) Contraceptives
Explanation:<\/strong> These drugs are used to prevent pregnancy.<\/p>\n\n\n\n

64. The most common antifertility drugs are:<\/mark><\/strong>
a) Hormonal contraceptives
b) Antibiotics
c) Tranquilizers
d) Antihistamines
Answer:<\/strong> a) Hormonal contraceptives
Explanation:<\/strong> They control ovulation by regulating hormone levels.<\/p>\n\n\n\n

65. Oral contraceptives usually contain:<\/mark><\/strong>
a) Progesterone derivatives
b) Estrogen derivatives
c) Combination of estrogen and progesterone
d) Antibiotics
Answer:<\/strong> c) Combination of estrogen and progesterone
Explanation:<\/strong> Combination pills suppress ovulation and prevent pregnancy.<\/p>\n\n\n\n

66. The \u201cmorning after pill\u201d contains:<\/mark><\/strong>
a) High dose of estrogen\/progesterone
b) Antihistamine
c) Antibiotic
d) Vitamin supplement
Answer:<\/strong> a) High dose of estrogen\/progesterone
Explanation:<\/strong> It prevents fertilization or implantation after unprotected intercourse.<\/p>\n\n\n\n

67. Which synthetic progesterone is used in contraceptive pills?<\/mark><\/strong>
a) Norethindrone
b) Paracetamol
c) Rifampicin
d) Diazepam
Answer:<\/strong> a) Norethindrone
Explanation:<\/strong> Norethindrone is a synthetic progesterone.<\/p>\n\n\n\n

68. Which synthetic estrogen is used in oral contraceptives?<\/mark><\/strong>
a) Ethinyl estradiol
b) Diazepam
c) Penicillin
d) Cortisone
Answer:<\/strong> a) Ethinyl estradiol
Explanation:<\/strong> Ethinyl estradiol is a synthetic estrogen.<\/p>\n\n\n\n

69. Oral contraceptives mainly prevent pregnancy by:<\/mark><\/strong>
a) Killing sperm
b) Blocking ovulation
c) Preventing menstruation
d) Killing eggs
Answer:<\/strong> b) Blocking ovulation
Explanation:<\/strong> Contraceptives maintain high hormone levels that inhibit ovulation.<\/p>\n\n\n\n

70. Which drug is used as a male contraceptive under research?<\/mark><\/strong>
a) RISUG (Reversible Inhibition of Sperm Under Guidance)
b) Diazepam
c) Penicillin
d) Ibuprofen
Answer:<\/strong> a) RISUG
Explanation:<\/strong> RISUG is a polymer-based injectable male contraceptive under trials in India.<\/p>\n\n\n\n

71. Which antifertility drug is also used in hormone replacement therapy?<\/mark><\/strong>
a) Norethindrone
b) Ethinyl estradiol
c) Progesterone
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Hormonal contraceptives are also used in HRT for menopause.<\/p>\n\n\n\n

72. Which antifertility method provides long-term protection without daily medication?<\/mark><\/strong>
a) Oral pills
b) Intrauterine device (IUD)
c) Morning-after pill
d) Antibiotics
Answer:<\/strong> b) Intrauterine device (IUD)
Explanation:<\/strong> IUDs release hormones\/copper \u2192 prevent pregnancy for years.<\/p>\n\n\n\n

73. Which drug was the first successful oral contraceptive pill?<\/mark><\/strong>
a) Progesterone
b) Norethindrone
c) Mifepristone
d) Ethinyl estradiol
Answer:<\/strong> b) Norethindrone
Explanation:<\/strong> Norethindrone was the first widely used oral contraceptive drug.<\/p>\n\n\n\n

74. Mifepristone is used as:<\/mark><\/strong>
a) Antibiotic
b) Abortifacient (medical termination of pregnancy)
c) Antacid
d) Antihistamine
Answer:<\/strong> b) Abortifacient
Explanation:<\/strong> Mifepristone blocks progesterone, used in medical abortion.<\/p>\n\n\n\n

75. Which of the following drugs is classified as a tranquilizer?
<\/mark><\/strong>a) Diazepam
b) Barbiturates
c) Alprazolam
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> All these act as tranquilizers to reduce anxiety and induce sleep.<\/p>\n\n\n\n

76. Antimicrobial drugs act against:
<\/mark><\/strong>a) Viruses only
b) Bacteria, fungi, and protozoa
c) Only parasites
d) Cancer cells
Answer:<\/strong> b) Bacteria, fungi, and protozoa
Explanation:<\/strong> Antimicrobials include antibiotics, antifungals, and antiparasitic drugs.<\/p>\n\n\n\n

77. Which drug is used to treat fungal infections?
<\/mark><\/strong>a) Amphotericin B
b) Streptomycin
c) Paracetamol
d) Aspirin
Answer:<\/strong> a) Amphotericin B
Explanation:<\/strong> Amphotericin B is an antifungal drug.<\/p>\n\n\n\n

78. Metronidazole is used for:<\/mark>
<\/strong>a) Bacterial infections
b) Amoebiasis
c) Malaria
d) Diabetes
Answer:<\/strong> b) Amoebiasis
Explanation:<\/strong> Metronidazole kills protozoa (Entamoeba histolytica).<\/p>\n\n\n\n

79. Antiviral drugs work by:<\/strong><\/mark>
a) Destroying host cells
b) Preventing viral replication
c) Killing bacteria
d) Neutralizing toxins
Answer:<\/strong> b) Preventing viral replication
Explanation:<\/strong> Antivirals block enzymes needed for virus multiplication.<\/p>\n\n\n\n

80. Zidovudine (AZT) is used in treatment of:<\/mark><\/strong>
a) Malaria
b) HIV\/AIDS
c) Tuberculosis
d) Influenza
Answer:<\/strong> b) HIV\/AIDS
Explanation:<\/strong> Zidovudine is an antiretroviral drug against HIV.<\/p>\n\n\n\n

81. Oseltamivir (Tamiflu) is effective against:
<\/mark><\/strong>a) HIV
b) Influenza virus
c) TB
d) Cancer
Answer:<\/strong> b) Influenza virus
Explanation:<\/strong> Tamiflu inhibits neuraminidase enzyme in influenza virus.<\/p>\n\n\n\n

82. Acyclovir is used to treat:
<\/mark><\/strong>a) Malaria
b) Herpes infections
c) Typhoid
d) Cancer
Answer:<\/strong> b) Herpes infections
Explanation:<\/strong> Acyclovir inhibits viral DNA synthesis.<\/p>\n\n\n\n

83. Which of the following is an anticancer drug?
<\/mark><\/strong>a) Cisplatin
b) Methotrexate
c) Cyclophosphamide
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> All these are chemotherapy agents against cancer.<\/p>\n\n\n\n

84. Cisplatin contains which metal?<\/mark><\/strong>
a) Gold
b) Platinum
c) Silver
d) Copper
Answer:<\/strong> b) Platinum
Explanation:<\/strong> Cisplatin is a platinum-based anticancer drug.<\/p>\n\n\n\n

85. Methotrexate works by:<\/mark><\/strong>
a) Inhibiting folic acid metabolism
b) Increasing insulin
c) Destroying DNA directly
d) Blocking histamine
Answer:<\/strong> a) Inhibiting folic acid metabolism
Explanation:<\/strong> Methotrexate prevents DNA synthesis in cancer cells.<\/p>\n\n\n\n

86. Which drug is used in chemotherapy of breast cancer?
<\/mark><\/strong>a) Tamoxifen
b) Rifampicin
c) Zidovudine
d) Ibuprofen
Answer:<\/strong> a) Tamoxifen
Explanation:<\/strong> Tamoxifen blocks estrogen receptors in breast tissue.<\/p>\n\n\n\n

87. Which drug is used for leukemia treatment?
<\/mark><\/strong>a) Cyclophosphamide
b) Methotrexate
c) Imatinib
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Several anticancer drugs are used in leukemia treatment.<\/p>\n\n\n\n

88. Which anticancer drug is also called a \u201cmagic bullet\u201d?
<\/mark><\/strong>a) Imatinib
b) Cisplatin
c) Tamoxifen
d) Methotrexate
Answer:<\/strong> a) Imatinib
Explanation:<\/strong> Imatinib selectively targets cancer cells (chronic myeloid leukemia).<\/p>\n\n\n\n

89. Side effects of anticancer drugs include:
<\/mark><\/strong>a) Hair loss
b) Nausea and vomiting
c) Immune suppression
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Chemotherapy affects normal dividing cells too.<\/p>\n\n\n\n

90. Which antimicrobial is effective against malaria?
<\/mark><\/strong>a) Quinine
b) Chloroquine
c) Artemisinin
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> All are antimalarial drugs from natural or synthetic sources.<\/p>\n\n\n\n

91. Artemisinin is obtained from:
<\/mark><\/strong>a) Neem
b) Cinchona
c) Sweet wormwood plant
d) Opium
Answer:<\/strong> c) Sweet wormwood plant
Explanation:<\/strong> Artemisinin from Artemisia annua is effective against malaria.<\/p>\n\n\n\n

92. Which vitamin is used as an antidote for methotrexate toxicity?
<\/mark><\/strong>a) Vitamin A
b) Vitamin B\u2081\u2082
c) Folic acid
d) Vitamin K
Answer:<\/strong> c) Folic acid
Explanation:<\/strong> Methotrexate inhibits folate metabolism; folic acid reverses toxicity.<\/p>\n\n\n\n

93. Which antimicrobial drug is effective against leprosy?
<\/mark><\/strong>a) Dapsone
b) Streptomycin
c) Penicillin
d) Tetracycline
Answer:<\/strong> a) Dapsone
Explanation:<\/strong> Dapsone is the main anti-leprosy drug.<\/p>\n\n\n\n

94. Which drug combination is used in multi-drug therapy for leprosy?
<\/mark><\/strong>a) Dapsone + Rifampicin + Clofazimine
b) Quinine + Chloroquine
c) Penicillin + Tetracycline
d) Methotrexate + Cisplatin
Answer:<\/strong> a) Dapsone + Rifampicin + Clofazimine
Explanation:<\/strong> WHO recommends this triple therapy for leprosy.<\/p>\n\n\n\n

95. Which antiviral drug is used in COVID-19 treatment?
<\/mark><\/strong>a) Remdesivir
b) Streptomycin
c) Quinine
d) Chloramphenicol
Answer:<\/strong> a) Remdesivir
Explanation:<\/strong> Remdesivir inhibits RNA-dependent RNA polymerase of coronavirus.<\/p>\n\n\n\n

96. Which anticancer drug is derived from the periwinkle plant?
<\/mark><\/strong>a) Vincristine
b) Cisplatin
c) Methotrexate
d) Rifampicin
Answer:<\/strong> a) Vincristine
Explanation:<\/strong> Vincristine (vinca alkaloid) from periwinkle is used in chemotherapy.<\/p>\n\n\n\n

97. Paclitaxel (Taxol), an anticancer drug, is obtained from:
<\/mark><\/strong>a) Neem tree
b) Yew tree
c) Cinchona tree
d) Poppy plant
Answer:<\/strong> b) Yew tree
Explanation:<\/strong> Paclitaxel from Pacific yew tree bark inhibits cell division.<\/p>\n\n\n\n

98. Which drug is used in organ transplant patients to suppress immunity?
<\/mark><\/strong>a) Morphine
b) Cyclosporine
c) Aspirin
d) Insulin
Answer:<\/strong> b) Cyclosporine
Explanation:<\/strong> Cyclosporine prevents organ rejection by suppressing immune response.<\/p>\n\n\n\n

99. Which drug is used for treating bipolar disorder (mood stabilizer)?
<\/mark><\/strong>a) Lithium carbonate
b) Diazepam
c) Aspirin
d) Paracetamol
Answer:<\/strong> a) Lithium carbonate
Explanation:<\/strong> Lithium stabilizes mood swings in bipolar disorder.<\/p>\n\n\n\n

100. The concept of chemotherapy was first introduced by:
<\/mark><\/strong>a) Paul Ehrlich
b) Alexander Fleming
c) Joseph Lister
d) Louis Pasteur
Answer:<\/strong> a) Paul Ehrlich
Explanation:<\/strong> Paul Ehrlich (father of chemotherapy) introduced the idea of using chemicals to selectively kill pathogens.<\/p>\n","protected":false},"excerpt":{"rendered":"

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