25 June 2026

Science quiz on energy sources

These concepts represent fundamental scientific principles and emerging technologies that provide useful context for understanding advancements in space and energy sectors, though they are too theoretical for direct examination questions.

Questions

1. Explain the working principles of unconventional energy extraction methods such as Magnetohydrodynamic (MHD) generators and salinity gradient power. Discuss their potential role in future sustainable energy transitions. 150 words
   Attempt this — 150 words in 8 min

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Prelims

1. Which of the following best describes the 'Gravity Assist' technique used in space exploration?

   1. A Using solar sails to capture photon pressure for acceleration
   2. B Employing ion thrusters to maintain constant velocity in deep space
   3. C Harnessing the magnetic field of a planet to generate onboard power
   4. D Utilising a planet's gravitational field to change a spacecraft's momentum

2. What does the term 'MHD' stand for in the context of experimental electricity generation?

   1. A Molecular Hydro-Dynamic
   2. B Mechanical Harmonic-Drive
   3. C Massive Heat-Distribution
   4. D Magneto-Hydro-Dynamic

3. The Casimir effect is a quantum phenomenon associated with which of the following?

   1. A The extraction of energy from a rotating black hole
   2. B The generation of power from salinity differences
   3. C The acceleration of spacecraft using planetary gravity
   4. D The force between two uncharged conducting plates in close proximity