Microbiology PYQs – Set 63

By Atul Sahu • Microbiology, Subject Wise PYQs

Microbiology PYQs – Set 63

Subject : Microbiology

1241. The protein toxins that have been modified to reduce the toxicity without significantly altering the immunogenicity are known as :

Microbiology • Toxoid vaccines • GPAT 2019

A. Sera B. Antisera C. Toxoids D. Vaccines

1242. Which method is useful for measuring the number of viable cells in a culture?

Microbiology • Viable Cell Count Methods • GPAT 2019

A. Plate count technique B. Dry weight method C. Petroff-Hausser counter D. Light scattering in a spectrophotometer

1243. Rabies bodies are known as:

Microbiology • Virology • GPAT 2019

A. Negri bodies B. Cowdry type B inclusions C. Cowdry type A inclusions D. Bollinger bodies

1244. The first vaccine was discovered by

Microbiology • Virology • GPAT 2019

A. DeBary B. Paul Ehrlich C. Robert Koch D. Edward Jenner

1245. Rubella virus is associated with which disease?

Microbiology • Virology • GPAT 2019

A. Progressive encephalitis B. Enterovirus infection C. Yellow fever D. Rubella virus

1246. Which of the following is NOT true about Ebola Virus Disease (EVD)?

Microbiology • Virology • GPAT 2019

A. Spreads via direct contact B. Antiviral drugs are approved by FDA C. Diagnostic tests include ELISA D. The virus is named after a river

1247. Which of the following about the Varicella‑Zoster Virus (VZV) is NOT true?

Microbiology • Virology • GPAT 2019

A. Varicella develops after an individual is exposed to VZV for the first time B. Herpes zoster develops from reactivation of the virus later in life C. There are no vaccines for this virus D. The infection results in post‑herpetic neuralgia

1248. What is the IUPAC name of the following compound?

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. Bicyclo[2.2.2] octane B. Tricyclo[2.2.2] octane C. Bicyclo[2.2.0] octane D. Bicyclo[2.2.1] heptane

1249. Which of the following alkyl halides would undergo an SN2 reaction most rapidly?

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. CH₃CH₂Br B. CH₃CH₂Cl C. CH₃CH₂I D. CH₃CH₂F

1250. Rank the following compounds in order of increasing reactivity in electrophilic aromatic substitution: (P) Benzene, (Q) Toluene, (R) Nitrobenzene.

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. Q < P < R B. R < P < Q C. Q < R < P D. P < Q < R

1251. Arrange the given acids in increasing order based on the number of carbon atoms: (P) Capric, (Q) Caprylic, (R) Caproic, (S) Lauric.

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. R < Q < P < S B. Q < R < P < S C. Q < R < S D. Q < P < R < S

1252. Elimination (via conjugate base) reaction leads to the formation of which intermediate?

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. Carbocation B. Carbanion C. Free radical D. Not applicable

1253. What will be the primary product of the following reaction? [Diagram provided]

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. Option A B. Option B C. Option C D. Option D

1254. Which of the following circled hydrogen is most acidic? [Structure provided]

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. 9 B. 9 C. [Option C] D. [Option D]

1255. The IUPAC name of the compound (CH₃)₂CHCH₂Cl is:

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. 2-Methyl-3-chloropropane B. [Not provided] C. 1-Chloropentane D. [Not provided]

1256. What strategy of drug design is frequently used on complex lead compounds derived from natural products?

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. Extension B. Simplification C. Rigidification D. Conformational block

1257. Which of the following groups can form ionic interactions and also act as a hydrogen bond acceptor?

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. Hydroxyl group (OH) B. Carboxylate group (RCOO–) C. Aminonium group (RNH₃⁺) D. Ketone (C=O)

1258. Which of the following is an example of a diazonium ion?

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. CH₃N⁺ B. CH₂N⁺ C. HN–NH⁺ D. None of these

1259. In a free radical reaction, free radicals are formed at

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. Initiation step B. Propagation step C. Termination step D. Both (a) and (b)

1260. In the reaction of 2‑nitrotoluene with bromine in the presence of iron, which of the products shown below is the most abundant (major) product?

Organic Chemistry • General Organic Chemistry • GPAT 2019

A. Structure A B. Structure B C. Structure C D. Structure D

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