How often should the air filter be replaced?

Explanation: The air filter should be replaced every 15,000–30,000 km for engine efficiency.

Q: Compound machines tend to have a greater mechanical advantage than what other machines?
Ans: simple machines

Q: What forms when one substance dissolves into another?
Ans: solution

Q: What is the term for the conversion of a liquid to its vapor below the boiling temperature of the liquid?
Ans: evaporation

Q: The book 'Maa (Mother)' written by whom was released on November 13, 2024?
Ans: Dr. Devendra Kumar Dhodawat

Q: What process is used for cell growth, repair of cuts and replacement of worn out cells?
Ans: pollination

Q: Where was India's first Oxygen Bird Park inaugurated on October 1, 2024?
Ans: Maharashtra

Q: What is able to occur because no surface is perfectly smooth?
Ans: friction

Q: How will global warming eliminate some islands and reduce the area of others?
Ans: raise sea levels

Q: On May 2, 2024, who has been awarded the title of Grandmaster by the International Chess Federation?
Ans: Vaishali Ramesh Babu

Q: Where has a new species of "Damselfish" been found recently?
Ans: Maldives

Q: Which Harappan site is in Punjab (Pakistan)?
Ans: Harappa

Q: What was a key factor in Trump’s tariff policy decisions in Feb 2025?
Ans: Economic growth

Q: Which word has been declared by Merriam Webster as the Word of the Year 2024?
Ans: Polarization

Q: What is the cycle of birth and rebirth called?
Ans: Samsara

Q: What allows some things to enter the cell while keeping other things out?
Ans: cell membrane