75.Though bromocriptine acts directly ondopamine receptors, it is used in parkinsonism only asa supplement to levodopa because
(a) It has low efficacy
(b) It produces ‘first dose hypotension’
(c) Used alone, its effective doses produce intolerable side effects
(d) Its therapeutic effect takes long time to develop

76. Nitrous oxide is
(a) Non-flammable
(b) Non-irritant
(c) Potent analgesis
(d) All of the above

77. Which of the following selective MAO–B inhibitor ?
(a) Selegiline
(b) Chlorgiline
(c) Moclobemide
(d) Tranylcypromine

78.Local anaesthetics are drugs that produce
(a) Irreversible loss of sensitivity to pain in the restricted area to which they are applied
(b) Reversible loss of sensitivity to pain in the restricted area to which they are applied.
(c) No loss of sensitivity to pain in the area to which they are applied
(d) None of the above

79. Local anaesthetic molecule consists of
(a) Lipophilic group linked by an ester or amide chain
(b) Lipophilic group linked by an ester or amide chain to an amine substitute
(c) Lipophilic group linked to an amine substitute
(d) None of the above

80. Ketamine, a general anaesthetic agentcan be administered by
(a) Intravenous route
(b) Intramuscular route
(c) Intravenous or Intramuscular route
(d) None of the above

81. In the following benzodiazepines used as intravenous general anaesthetic which one has amore rapid onset and shorter half life
(a) Diazepam
(b) Lorazepam
(c) Midazolam
(d) All of the above

82. Which of the following is a intravenous anaesthetic
(a) Thiopental
(b) Ethomidate
(c) Propofol
(d) Ketamine