Which family of viruses has single stranded DNA?
(A) Herpesviridae (B) Poxviridae (C) Retroviridae (D) Parvoviridae
Options:
(A) Herpesviridae
(B) Poxviridae
(C) Retroviridae
(D) Parvoviridae
Official Answer Key:
A
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2016 Q.02)**
**1. Governing Concept & Question Classification**:
- **Section**: General Aptitude (GA)
- **Question Type**: **MCQ** (1 Mark)
- **Topic**: English Grammar (Past Participle of "Hang": Hanged vs. Hung)
**2. Detailed Step-by-Step Analysis**:
- The sentence states: *“The unruly crowd demanded that the accused be _____________ without trial.”*
- The verb **hang** has two distinct past participle forms with different semantic meanings:
1. **Hanged**: Used exclusively when referring to execution by suspension by the neck until dead (capital punishment or lynching).
2. **Hung**: Used for suspending an inanimate object (e.g., *“He hung the picture on the wall”*).
- Because the crowd is demanding the extrajudicial execution of a person (the accused), the correct legal and grammatical form is **hanged**.
- **Option-by-Option Evaluation**:
- **Option (A) [CORRECT]**: *"hanged"* is the correct past participle referring to execution/death by hanging.
- **Option (B) [INCORRECT]**: *"hanging"* is a present participle, which violates the passive subjunctive construction (*“be [past participle]”*).
- **Option (C) [INCORRECT]**: *"hankering"* means longing or craving, which is nonsensical.
- **Option (D) [INCORRECT]**: *"hung"* applies to hanging inanimate objects, not capital execution.
**3. Final Answer / Verification Summary**:
- **Official GATE Answer Key**: **A**
- **Scoring Criteria**: +1.0 Mark (Negative marking: -0.33 marks).
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