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1. What fundamental property of semiconductors distinguishes them from conductors and insulators?

 

Select the correct option from the following:

1. Bandgap width
2. Electron affinity
3. Fermi level
4. Lattice constant

 

Answer:  Option A –  Bandgap width

 

Explanation:

• Semiconductors have a narrow bandgap between their valence and conduction bands, allowing them to conduct electricity under certain conditions but not as freely as conductors.
• This characteristic defines their behaviour and distinguishes them from conductors with wide bandgaps and insulators with completely filled valence bands.

 

2. From which country did India procure its AH-64E Apache Guardian attack helicopters?

 

Select the correct option from the following:

1. United States
2. Russia
3. Israel
4. United Kingdom

 

Answer:  Option A – United States

 

Explanation:

• India procured its AH-64E Apache Guardian attack helicopters from the United States.
• These helicopters are equipped with advanced weaponry and technology, enhancing India’s aerial combat capabilities.

 

 

 

 

 

 

 

3. Who holds the position of the Chairperson in India’s Defence Acquisition Council (DAC)?

 

Select the correct option from the following:

1. Prime Minister
2. Defence Minister
3. Chief of Defence Staff
4. National Security Advisor

 

Answer:  Option B – Defence Minister

 

Explanation:

• The Defence Minister of India holds the position of Chairperson in the Defence Acquisition Council (DAC).
• As the head of the DAC, the Defence Minister oversees the decision-making process regarding defence procurement and acquisitions, ensuring strategic alignment and efficient utilization of resources in bolstering India’s defence capabilities.

 

 

4. With which country did India sign the Communication Compatibility and Security Agreement (COMCASA)?

 

Select the correct option from the following:

1. Russia
2. China
3. United States
4. France

 

Answer:  Option C – United States

 

Explanation:

• India signed the Communication Compatibility and Security Agreement (COMCASA) with the United States.
• COMCASA facilitates secure communication and data sharing between the armed forces of both countries, enhancing interoperability and strategic coordination.

 

 

5. Which of the following factors significantly contributes to the degradation of lithium-ion batteries, affecting the long-term performance of Electric Vehicles (EVs)?

 

Select the correct option from the following:

1. Coulombic efficiency
2. Peukert’s law
3. Solid-electrolyte interphase (SEI)
4. Faraday’s law

 

Answer:  Option C – Solid-electrolyte interphase (SEI)

 

Explanation:

• Solid-electrolyte interphase (SEI). SEI formation is a crucial phenomenon occurring on the surface of lithium-ion battery electrodes, affecting the battery’s stability and longevity.
• As SEI grows over successive charge-discharge cycles, it can impede ion flow and degrade battery performance, posing challenges for Electric Vehicles (EVs) in maintaining their efficiency and range over time.

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