3 September : Daily Current Affairs Quiz

Answer:  Option B - Analysis of ancient DNA to understand historical human genetic variations.

Explanation:

• Palaeogenomics is the analysis of ancient DNA to understand historical human genetic variations and migrations.
• By studying genetic material from archaeological remains, scientists can uncover insights into past human populations, their movements, and their interactions.
• This field provides valuable information about ancient societies, including their origins, genetic diversity, and evolutionary history, distinguishing it from studies focused on contemporary or genetically modified species.

Answer:  Option B - Reduction of extra costs due to delays in transportation

Explanation:

• "Zero Demurrage" refers to eliminating additional costs incurred due to delays in the transportation of goods.
• In the context of RINL’s campaign, it aims to prevent extra charges that are typically applied when shipments are held up beyond the agreed period.
• This initiative is designed to cut operational costs and enhance efficiency by ensuring timely dispatch and delivery of materials, thus reducing overall expenses.

Answer:  Option C - Transistor

Explanation:

• A transistor is a semiconductor device used to amplify or switch electronic signals.
• It operates by controlling the flow of electrical current between two terminals, the collector and emitter, through a third terminal, the base.
• By varying the base current, the transistor can regulate a larger current between the collector and emitter, making it essential in modern electronic circuits for functions like amplification and switching.
• This capability underpins its widespread use in everything from simple electronics to complex computing systems.

Answer:  Option C - Shock wave compression

Explanation:

• In a ramjet engine, compression of incoming air is achieved through shock wave compression.
• As the ramjet engine moves at high speeds, the air is compressed by shock waves generated at the engine's intake.
• This method does not use moving parts like compressors but relies on the high-speed airflow and aerodynamic design to compress air, making it suitable for supersonic speeds.

Answer:  Option D - Variable band gap

Explanation:

• Semiconductors have a variable band gap, which allows them to conduct electricity only under certain conditions.
• Unlike insulators with a large band gap, semiconductors have a smaller, tunable band gap that can be manipulated by adding impurities or changing temperature, enabling controlled electrical conduction.
• Crystal lattice structure affects the arrangement of atoms but not the fundamental conductive properties directly.
• Temperature sensitivity influences the conductivity by affecting the number of charge carriers, but it’s the band gap that defines the fundamental conductivity characteristics.
• High melting point is related to the material's thermal stability, not its electrical conductivity under varying conditions.