Which of the following is an example of the Doppler effect? MCQ with Answer and Explanation

Explanation:
In the SI system of prefixes, 'Peta' stands for 10^15. Other common large prefixes include Kilo (10^3), Mega (10^6), Giga (10^9), Tera (10^12), and Exa (10^18). It's crucial to memorize both positive and negative powers (like nano, pico, femto) for competitive exams.

Explanation:
Coulomb is the SI unit of electric charge, but it is a derived unit (Ampere × second). The seven fundamental SI units are meter (length), kilogram (mass), second (time), Kelvin (temperature), Ampere (electric current), candela (luminous intensity), and mole (amount of substance). Electric current is fundamental, making Ampere fundamental, not Coulomb.

Explanation:
Relative speed = 60+6 = 66 km/h = 66×5/18 = 55/3 m/s. Time = distance / relative speed = 150 / (55/3) = 450/55 = 8.18 s ≈ 9 s. Actually 450/55=8.18, nearest 9 s. Option B.