A-Level H2 Physics 6

Question 1

What is nuclear binding energy?

Accepted Answer

The energy required to completely separate a nucleus into its constituent protons and neutrons

Answer

Nuclear binding energy is the energy required to completely separate a nucleus into its individual protons and neutrons (nucleons). It equals the mass defect × c² (E=mc²).

Question 2

What is the difference between fission and fusion?

Accepted Answer

Fission splits heavy nuclei; fusion combines light nuclei to release energy

Answer

Nuclear fission splits heavy nuclei (e.g., uranium-235) into smaller fragments, releasing energy. Nuclear fusion combines light nuclei (e.g., hydrogen isotopes) to form heavier nuclei, releasing even more energy per nucleon.

Question 3

What is meant by 'resonance' in mechanical systems?

Accepted Answer

When the driving frequency equals the natural frequency, producing maximum amplitude oscillations

Answer

Resonance occurs when the driving frequency matches the natural frequency of the system. At resonance, amplitude is maximum (limited only by damping) as energy is efficiently transferred to the system.

Question 4

What does 'Lenz's Law' state?

Accepted Answer

The induced current is in such a direction that its magnetic effect opposes the change causing it

Answer

Lenz's Law states that the direction of the induced current is such that it opposes the change in flux that produced it — a consequence of conservation of energy.

Question 5

What is the condition for a particle to undergo uniform circular motion?

Accepted Answer

A centripetal force acts towards the centre, changing direction but not speed

Answer

For uniform circular motion, a centripetal force directed toward the centre is required. It changes the direction of velocity (not speed), causing circular motion. F_c = mv²/r = mω²r.

GCE A-Level Practice Test

GCE A-Level Practice Test

A-Level H2 Physics 6