27 August : Daily Current Affairs Quiz

Answer:  Option B - The force exerted by a spring is proportional to its extension.

Explanation:

• Hooke's Law states that the force exerted by a spring increases proportionally with the amount the spring is stretched or compressed from its natural length.
• In simpler terms, the more you stretch or compress the spring, the greater the force it exerts in response.
• This relationship holds true as long as the spring is not deformed beyond its elastic limit, where it would no longer return to its original shape.

Answer:  Option C - Magnetic field regions around Earth containing high-energy charged particles.

Explanation:

• The Van Allen belts are two zones of high-energy charged particles trapped by Earth's magnetic field.
• Located in the outer regions of the magnetosphere, these belts extend from about 1,000 to 60,000 kilometers above Earth's surface.
• They play a crucial role in protecting our planet from solar and cosmic radiation by deflecting high-energy particles, thus safeguarding the atmosphere and surface from harmful radiation.

Answer:  Option B - To advance commercial spaceflight and space exploration.

Explanation:

• The primary aim of SpaceX's Polaris Dawn mission is to advance commercial spaceflight and space exploration.
• The mission will conduct scientific research, test new technologies, and attempt to set a new altitude record.
• It is a significant step towards future private spaceflight missions and could help pave the way for human exploration beyond Earth's orbit.

Answer:  Option C - Full literacy is achieved when a State or Union Territory reaches a 95% literacy rate.

Explanation:

• The government defines full literacy as a 95% literacy rate in a State or Union Territory.
• This standard includes the ability to read, write, and compute with comprehension, incorporating essential life skills such as digital and financial literacy.
• Achieving this threshold ensures a high level of literacy across the population, reflecting significant educational progress and widespread basic skill acquisition.

Answer:  Option B - A method to silence gene expression by degrading specific mRNA molecules

Explanation:

• RNA interference (RNAi) is a biological process where RNA molecules inhibit gene expression by causing the degradation of specific messenger RNA (mRNA) molecules.
• This silencing mechanism is crucial for regulating genes and defending against viruses.
• Small interfering RNAs (siRNAs) or microRNAs (miRNAs) guide the RNA-induced silencing complex (RISC) to target mRNA, leading to its breakdown and preventing translation into proteins, thus controlling gene expression.