Students often search for resources like virus MCQ, virus MCQs, and MCQ on virus to prepare for competitive and academic exams. These virus MCQ with answers help learners test their knowledge and identify weak areas. Many prefer virus multiple choice questions and answers PDF for offline practice as it becomes easy and accessible to revise the topic quickly. Teachers also use virus quiz questions and answers to assess classroom understanding. Detailed and variety of virus questions and answers are useful for revision. Learners looking for objective practice can benefit from MCQs on virus, especially when available in virus MCQ with answers PDF format for quick reference and structured exam preparation.

Download Virus Multiple Choice Questions and Answers PDF

Biology Notes Free PDFs (NEET/CUET/Boards)

Topic	PDF Link
Class 12 Biology Short Notes PDF	Download PDF
Important Abbreviations for NCERT Biology	Download PDF
Class 11 Biology Short Notes PDF	Download PDF
Human Health and Diseases Study Notes	Download PDF
Wheatstone Bridge Notes	Download PDF
Alternating Current Notes	Download PDF
Friction in Physics	Download PDF
Drift Velocity Notes	Download PDF
Chemical Equilibrium Notes	Download PDF
Quantum Number in Chemistry Notes	Download PDF

Virus MCQ Question and Answers

1. What components make up a virus?

(a) A protein shell and nucleic acid

(b) A protein shell and mitochondria

(c) Nucleic acid and cell membrane

(d) Nucleic acid, cell wall, and cell membrane

Answer: (a) A protein shell and nucleic acid.

2. What is the name for the protein shell of a virus that encloses the genetic material?

(a) Virion

(b) Capsid

(c) Peplomers

(d) Capsomers

Answer: (b) Capsid.

3. Which statement is true about a virion?

(a) It's a lytic phage

(b) It's a lysogenic phage

(c) It refers to the viral capsid

(d) It's an infectious and fully formed viral particle

Answer: (d) It's an infectious and fully formed viral particle.

4. What forms the genome of a virus?

(a) DNA

(b) RNA

(c) Either DNA or RNA

(d) Both DNA and RNA

Answer: (c) Either DNA or RNA.

5. Which is the largest known virus?

(a) Megavirus chilensis

(b) Arbovirus

(c) Herpesvirus

(d) Mumps virus

Answer: (a) Megavirus chilensis.

6. Which statement is true about capsomeres?

(a) They are individual units of the capsid

(b) They are viral proteins for replication

(c) They are units of nucleic acid in viruses

(d) All of the above

Answer: (a) They are individual units of the capsid.

7. Which statement is true about peplomeres?

(a) They are individual units of capsids

(b) They are spike-like projections on enveloped viruses

(c) They are projections on the viral membrane

(d) They are spike-like projections on capsids

Answer: (b) They are spike-like projections on enveloped viruses.

8. An icosahedral capsid is made up of what?

(a) Hexagonal capsomeres

(b) Pentagonal capsomeres

(c) Triangular capsomeres

(d) Both a and b

Answer: (d) Both a and b.

9. Which virus has complex symmetry?

(a) T4 bacteriophage

(b) Adenovirus

(c) Influenza virus

(d) All of the above

Answer: (a) T4 bacteriophage.

10. What is the viral envelope composed of?

(a) Proteins

(b) Glycoproteins

(c) Lipids and proteins

(d) All of the above

Answer: (d) All of the above.

11. Which of the following is a helical virus?

(a) TMV (Tobacco Mosaic Virus)

(b) T4 bacteriophage

(c) Poxvirus

(d) Herpesvirus

Answer: (a) TMV (Tobacco Mosaic Virus).

12. Which of the following statements is true about viruses?

(a) They are free-living

(b) Viruses are obligate parasites

(c) Both (a) and (b)

(d) None of the above

Answer: (b) Viruses are obligate parasites.

13. What is a fully formed infectious viral particle called?

(a) Virion

(b) Viroid

(c) Capsid

(d) Virusoid

Answer: (a) Virion.

14. What forms the genetic component of viruses?

(a) RNA

(b) DNA

(c) ss DNA

(d) Either DNA or RNA

Answer: (d) Either DNA or RNA.

15. What is the protein shell that envelops the viral genome called?

(a) Capsid

(b) Outer envelope

(c) Capsomere

(d) Nucleic

Answer: (a) Capsid.

16. Which of the following statements is true about the tobacco mosaic virus (TMV)?

(a) It's an RNA virus

(b) It's a DNA virus

(c) It's a bacteriophage(d) It's either ss DNA or ds DNA

Answer: (a) It's an RNA virus.

17. What is the shape of the TMV (Tobacco Mosaic Virus)?

(a) Rod-shaped

(b) Egg-shaped

(c) Cuboid-shaped

(d) Sphere-shaped

Answer: (a) Rod-shaped.

18. What are viruses that infect bacteria called?

(a) Virophage

(b) Lysophage

(c) Bacteriophage

(d) None of the above

Answer: (c) Bacteriophage.

19. What type of phage is the T2 phage?

(a) ss DNA phage

(b) ss RNA phage

(c) ds DNA phage

(d) ds RNA phage

Answer: (c) ds DNA phage.

20. What are bacteriophages that cause bacterial cell lysis called?

(a) Viroids

(b) Lysogenic phages

(c) Virulent phages

(d) Temperate phages

Answer: (c) Virulent phages.

21. Which virus has the smallest genome?

(a) Rabies virus

(b) Circovirus

(c) Herpesvirus

(d) Mimivirus

Answer: (b) Circovirus.

22. What are infectious RNA particles without a protein coat called?

(a) Prion

(b) Virion

(c) Viroid

(d) Virusoid

Answer: (c) Viroid.

23. What are the spike-like projections on the viral capsid known as?

(a) Viroid

(b) Proteomes

(c) Peplomers

(d) Capsomeres

Answer: (c) Peplomers.

24. What is the term for the viral genome inserted into bacterial DNA?

(a) Lysogeny

(b) Prophage

(c) Lytic cycle

(d) Virulent phage

Answer: (b) Prophage.

25. What are the main functions of the capsid?

(a) It determines the antigenic specificity of the virus

(b) It protects genetic material from nuclease attack

(c) Both A and B

(d) None of these

Answer: (c) Both A and B.

26. Which virus causes AIDS in humans?

(a) HSV

(b) HPV

(c) HIV

(d) HBV

Answer: (c) HIV.

27. Which enzyme is responsible for reverse transcription in retroviruses?

(a) RNA polymerase

(b) Reverse transcriptase

(c) DNA ligase

(d) Helicase

Answer: (b) Reverse transcriptase.

28. Which of the following viruses has an envelope?

(a) TMV

(b) Rabies virus

(c) Adenovirus

(d) None of the above

Answer: (b) Rabies virus.

29. What is the genetic material in most plant viruses?

(a) ds RNA

(b) ss DNA

(c) ss RNA

(d) ds DNA

Answer: (c) ss RNA.

30. What is the function of glycoproteins on the viral envelope?

(a) DNA synthesis

(b) Host recognition and attachment

(c) Replication

(d) Capsid formation

Answer: (b) Host recognition and attachment.

31. Which disease is caused by the Hepatitis B virus?

(a) Liver cirrhosis

(b) AIDS

(c) Rabies

(d) Influenza

Answer: (a) Liver cirrhosis.

32. Which virus causes chickenpox?

(a) Varicella-zoster virus

(b) Rubella virus

(c) Measles virus

(d) Cytomegalovirus

Answer: (a) Varicella-zoster virus.

33. Which of the following is a DNA virus?

(a) TMV

(b) HIV

(c) Herpesvirus

(d) Influenza virus

Answer: (c) Herpesvirus.

34. What type of nucleic acid does a retrovirus contain?

(a) ds DNA

(b) ss RNA

(c) ds RNA

(d) ss DNA

Answer: (b) ss RNA.

35. Which virus is used as a vector in gene therapy?

(a) HIV

(b) Adenovirus

(c) TMV

(d) Rabies virus

Answer: (b) Adenovirus.

36. What does a lytic virus do to its host cell?

(a) Integrates into host DNA

(b) Kills it by causing cell lysis

(c) Converts it into a bacterium

(d) Changes its function permanently

Answer: (b) Kills it by causing cell lysis.

37. What type of virus is HPV (Human Papillomavirus)?

(a) RNA virus

(b) Retrovirus

(c) DNA virus

(d) Prion

Answer: (c) DNA virus.

38. What is a prion?

(a) A DNA virus

(b) A proteinaceous infectious agent

(c) An RNA virus

(d) A bacterial enzyme

Answer: (b) A proteinaceous infectious agent.

39. Which virus is known for latency and reactivation?

(a) Herpes Simplex Virus

(b) HIV

(c) Influenza virus

(d) Dengue virus

Answer: (a) Herpes Simplex Virus.

40. Which virus causes polio?

(a) Poliovirus

(b) Rubella virus

(c) Hepatitis C virus

(d) Dengue virus

Answer: (a) Poliovirus.

41. In which of the following does viral replication occur in the cytoplasm?

(a) Herpesvirus

(b) Influenza virus

(c) TMV

(d) HIV

Answer: (c) TMV.

42. Which virus affects the nervous system and is transmitted by animals?

(a) Rabies virus

(b) Polio virus

(c) Rotavirus

(d) Measles virus

Answer: (a) Rabies virus.

43. Which structure helps a bacteriophage inject its DNA into a bacterial cell?

(a) Head

(b) Tail sheath

(c) Capsid

(d) Envelope

Answer: (b) Tail sheath.

44. What is the incubation period of the HIV virus before symptoms appear?

(a) 1–2 days

(b) 3–4 weeks

(c) Months to years

(d) Immediately after infection

Answer: (c) Months to years.

45. Which of the following viruses causes dengue fever?

(a) Flavivirus

(b) Coronavirus

(c) Togavirus

(d) Rhabdovirus

Answer: (a) Flavivirus.

46. Which virus primarily affects the liver?

(a) Hepatitis B

(b) HIV

(c) Herpesvirus

(d) Adenovirus

Answer: (a) Hepatitis B.

47. Which of the following is not a feature of viruses?

(a) Metabolism

(b) Replication in host

(c) Nucleic acid

(d) Protein coat

Answer: (a) Metabolism.

48. What is the name of the process by which viruses multiply inside host cells?

(a) Budding

(b) Binary fission

(c) Lytic or lysogenic cycle

(d) Sporulation

Answer: (c) Lytic or lysogenic cycle.

49. Which virus caused the COVID-19 pandemic?

(a) MERS-CoV

(b) SARS-CoV-2

(c) Influenza A

(d) SARS-CoV-1

Answer: (b) SARS-CoV-2.

50. Which virus causes measles?

(a) Morbillivirus

(b) Rubella virus

(c) Rhabdovirus

(d) Enterovirus

Answer: (a) Morbillivirus.

Keep learning with our Biology section for more MCQs and other related topics. Download Testbook App for entrance and government exam study material.

Important Links
NEET Exam
NEET Previous Year Question Papers	NEET Mock Test	NEET Syllabus
CUET Exam
CUET Previous Year Question Papers	CUET Mock Test	CUET Syllabus
JEE Main Exam
JEE Main Previous Year Question Papers	JEE Main Mock Test	JEE Main Syllabus
JEE Advanced Exam
JEE Advanced Previous Year Question Papers	JEE Advanced Mock Test	JEE Advanced Syllabus