Free Veterinary Medicine MCQs with Answers
59 Veterinary Medicine MCQs from Veterinary Science, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Covers the recognition, diagnosis, prevention and medical treatment of diseases affecting domestic animals, including infectious, metabolic, nutritional, toxic and organ-system disorders. It links history taking, physical examination, clinical signs, laboratory findings and differential diagnosis with appropriate therapy and herd or flock control.
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- A. Picornaviridae
- B. Herpesviridae
- C. Retroviridae
- D. Adenoviridae
Explanation: Foot and mouth disease virus belongs to the family Picornaviridae and affects cloven hoofed animals.
Correct answer: Picornaviridae- A. Budding yeast cells inside neutrophils
- B. Paired pear shaped organisms inside red cells
- C. Large acid fast rods between red cells
- D. Motile larvae within platelet clumps
Explanation: Babesia organisms are intraerythrocytic parasites and may appear as paired pear shaped bodies in red blood cells.
Correct answer: Paired pear shaped organisms inside red cells- A. Listeria monocytogenes
- B. Corynebacterium pseudotuberculosis
- C. Clostridium perfringens type D
- D. Mycobacterium bovis
Explanation: Clostridium perfringens type D causes enterotoxaemia, often called pulpy kidney disease, in rapidly growing sheep receiving rich diets.
Correct answer: Clostridium perfringens type D- A. Vitamin B12 deficiency
- B. Vitamin C deficiency
- C. Vitamin K deficiency
- D. Vitamin A deficiency
Explanation: Vitamin A deficiency can cause poor growth, rough coat, impaired epithelial health, and night blindness.
Correct answer: Vitamin A deficiency45. Which toxin is responsible for the characteristic rigid paralysis of generalized tetanus in a horse?
- A. Tetanospasmin from Clostridium tetani
- B. Botulinum toxin from Clostridium botulinum
- C. Endotoxin from Escherichia coli
- D. Alpha toxin from Clostridium perfringens
Explanation: Tetanospasmin blocks inhibitory neurotransmission, producing muscle rigidity, spasms, and a locked jaw.
Correct answer: Tetanospasmin from Clostridium tetani46. Which hormone is released in response to teat stimulation and causes milk letdown in a dairy cow?
- A. Progesterone
- B. Oxytocin
- C. Follicle stimulating hormone
- D. Cortisol
Explanation: Teat stimulation causes release of oxytocin from the posterior pituitary, producing contraction of myoepithelial cells around the alveoli.
Correct answer: Oxytocin- A. Toxoid vaccine
- B. Inactivated whole cell vaccine
- C. Live attenuated vaccine
- D. Passive antiserum
Explanation: Live attenuated vaccines contain organisms weakened so they usually replicate without causing the full disease, generating broad immune…
Correct answer: Live attenuated vaccine- A. High fever with painful swollen joints
- B. Severe jaundice with dark orange urine
- C. Profuse salivation with repeated swallowing
- D. Cold ears with muscle weakness and depression
Explanation: Early hypocalcaemia commonly causes weakness, depression, cold extremities, and reduced rumen motility before the cow becomes recumbent.
Correct answer: Cold ears with muscle weakness and depression- A. Aseptically obtained cystocentesis sample
- B. Urine collected from the examination table
- C. Midstream sample from an unclean floor
- D. Sample taken from the fur around the prepuce
Explanation: Cystocentesis collects urine directly from the bladder and greatly reduces contamination from the skin, genital tract, and environment.
Correct answer: Aseptically obtained cystocentesis sample- A. Streptococcus zooepidemicus
- B. Streptococcus equi subsp. equi
- C. Rhodococcus equi
- D. Actinobacillus equuli
Explanation: Strangles is caused by Streptococcus equi subsp. equi, which produces fever and abscessation of the retropharyngeal lymph nodes.
Correct answer: Streptococcus equi subsp. equi- A. Simulium black fly
- B. Rhipicephalus hard tick
- C. Culicoides biting midge
- D. Culex mosquitoes
Explanation: Bluetongue virus is transmitted mainly by female Culicoides biting midges.
Correct answer: Culicoides biting midge- A. Decreased serum insulin concentration
- B. Decreased serum thyroxine concentration
- C. Increased serum cortisol concentration
- D. Increased serum thyroxine concentration
Explanation: Feline hyperthyroidism usually causes an increased total serum thyroxine concentration because of excessive thyroid hormone production.
Correct answer: Increased serum thyroxine concentration53. What is the most appropriate environmental measure for reducing recurrent airway disease in a horse?
- A. Reduce inhaled stable dust and mould
- B. Increase dry hay and bedding dust
- C. Keep the horse in a closed stable
- D. Administer antibiotics throughout the year
Explanation: Reducing dust and mould exposure, often by improving ventilation and using steamed or soaked hay, is central to managing recurrent airway…
Correct answer: Reduce inhaled stable dust and mould- A. Vitamin C deficiency
- B. Thiamine deficiency
- C. Vitamin K deficiency
- D. Riboflavin deficiency
Explanation: Thiamine deficiency is associated with polioencephalomalacia, producing cortical neurologic signs such as blindness, opisthotonus, and…
Correct answer: Thiamine deficiency- A. Follicle-stimulating hormone
- B. Progesterone
- C. Prostaglandin F2 alpha
- D. Oxytocin from the posterior pituitary
Explanation: The uterine endometrium releases prostaglandin F2 alpha, which causes regression of the corpus luteum in a non-pregnant cow.
Correct answer: Prostaglandin F2 alpha- A. Capsular swelling by hyaluronic acid
- B. Tetanus neurotoxin production
- C. Mycolic acid formation
- D. F5 or K99 fimbrial adhesion
Explanation: F5, also called K99, fimbriae allow enterotoxigenic E. coli to attach to receptors on the neonatal calf intestine.
Correct answer: F5 or K99 fimbrial adhesion- A. Bursa of Fabricius
- B. Thymus gland
- C. Pancreas
- D. Cecal tonsils
Explanation: Infectious bursal disease virus primarily damages the Bursa of Fabricius, an important site of B-lymphocyte development in young chickens.
Correct answer: Bursa of Fabricius- A. Persistent circling with head pressing
- B. Shifting weight between painful forefeet
- C. Unilateral facial paralysis
- D. Marked inspiratory stridor
Explanation: A horse with laminitis commonly shifts weight, stands with the forelimbs stretched forward, and shows painful feet, especially in the…
Correct answer: Shifting weight between painful forefeet59. Which radiographic appearance is classically associated with gastric dilatation-volvulus in a dog?
- A. Collapsed urinary bladder
- B. Diffuse mineralized lung nodules
- C. Compartmentalized gas-filled stomach
- D. Generalized thickened intestinal walls
Explanation: Gastric dilatation-volvulus can produce a compartmentalized or double-bubble gas pattern because the stomach is abnormally rotated.
Correct answer: Compartmentalized gas-filled stomach