If the electrical resistance of a typical substance suddenly drops to zero, then the substance is called :

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Q: 16 (NDA-I/2011)
If the electrical resistance of a typical substance suddenly drops to zero, then the substance is called :

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,22,17,22,6,4,7

keywords: 

{'super conductor': [0, 0, 0, 1], 'electrical resistance': [0, 0, 0, 1], 'conductor': [0, 0, 1, 2], 'semiconductor': [0, 0, 0, 2], 'insulator': [0, 0, 0, 2], 'substance': [2, 1, 7, 7], 'typical substance': [0, 0, 0, 1]}

When the electrical resistance of a substance drops to zero, it means that the substance allows the flow of electric current without any resistance. This property is known as superconductivity.

Option 1: Superconductor - This is the correct answer. Superconductors are materials that, at low temperatures, exhibit zero electrical resistance and allow for the uninterrupted flow of electric current.

Option 2: Semiconductor - Semiconductors are materials that have an intermediate level of electrical conductivity. They are neither superconductors nor insulators.

Option 3: Conductor - Conductors are materials that allow the flow of electric current, but they still have some resistance. They are not the correct answer in this case since they do not exhibit zero resistance.

Option 4: Insulator - Insulators are materials that have high electrical resistance and do not allow the flow of electric current easily. They are not the correct answer in this case since they do not exhibit zero resistance.

In conclusion, when the electrical resistance of a substance suddenly drops to zero, it is called a superconductor.