PHYSICS AQA ACTUAL QUESTIONS AND
CORRECT ANSWERS COMPLETE STUDY
GUIDE
●● Absolute Zero
Answer: Lowest possible temperature, 0K, object has minimum internal
energy.
●● Scalar
Answer: A quantity that only has magnitude
●● Acceleration
Answer: Change of velocity per unit time.
●● free body diagram
Answer: a diagram showing all the forces acting on an object
●● Activity of a Radioactive Isotope
Answer: Number of nuclei of the isotope that disintegrate per second.
●● Energy: scalar or vector?
Answer: scalar
,●● Becquerel (Bq)
Answer: Unit of radioactive activity, 1Bq = 1 disintegration per second.
●● Acceleration: scalar or vector?
Answer: vector
●● Amplitude
Answer: Maximum displacement from equilibrium of oscillating object.
●● Displacement (scalar or vector)
Answer: vector
●● Angular Displacement
Answer: Angle an object in circular motion turns through in radians.
𝜃 = 𝜔t
●● Speed: scalar or vector?
Answer: scalar
●● Angular Speed (ω)
,Answer: Rate of change of angular displacement of object in circular
motion.
𝜔 = 2𝜋f
●● Annihilation
Answer: When a *particle and its antiparticle meet*, they destroy each
other to *produce 2 photons of equal energy*.
Here the minimum energy of each photon produced = hf(min) = rest
energy of the particle.
●● Antiparticle
Answer: *Equal rest mass* and *equal and opposite charge* to particle.
●● Atomic Number, Z
Answer: Number of *protons* in nucleus of atom.
●● Avogadro Constant
Answer: The *number of atoms in 12g of carbon-12*. Used to define the
mole.
●● Back emf
Answer: The emf induced in the spinning coil of electric motor or in any
coil in which the current is changing. A back emf acts against the change
of applied pd.
, ●● Background Radiation
Answer: *Radiation due to naturally occurring substances* in the
environment e.g. radon gas, cosmic rays, ground and buildings.
●● Binding Energy
Answer: *Work done* to separate a nucleus into its *constituent
nucleons* (neutrons and protons).
E = mass defect x c²
●● Binding Energy per Nucleon
Answer: Average work done per nucleon to separate nucleus into
constituent parts. Higher the value, the more stable the nucleus.
*BE per nucleon = BE of a nucleus / mass number*.
●● Boyle's Law
Answer: For a *fixed mass of gas* at a *constant temperature*, its
*pressure x volume is constant*. Gases that obey this are an ideal gas.
●● Boltzmann Constant (k)
Answer: Molar gas constant divided by Avogadro number.
●● Brittle
CORRECT ANSWERS COMPLETE STUDY
GUIDE
●● Absolute Zero
Answer: Lowest possible temperature, 0K, object has minimum internal
energy.
●● Scalar
Answer: A quantity that only has magnitude
●● Acceleration
Answer: Change of velocity per unit time.
●● free body diagram
Answer: a diagram showing all the forces acting on an object
●● Activity of a Radioactive Isotope
Answer: Number of nuclei of the isotope that disintegrate per second.
●● Energy: scalar or vector?
Answer: scalar
,●● Becquerel (Bq)
Answer: Unit of radioactive activity, 1Bq = 1 disintegration per second.
●● Acceleration: scalar or vector?
Answer: vector
●● Amplitude
Answer: Maximum displacement from equilibrium of oscillating object.
●● Displacement (scalar or vector)
Answer: vector
●● Angular Displacement
Answer: Angle an object in circular motion turns through in radians.
𝜃 = 𝜔t
●● Speed: scalar or vector?
Answer: scalar
●● Angular Speed (ω)
,Answer: Rate of change of angular displacement of object in circular
motion.
𝜔 = 2𝜋f
●● Annihilation
Answer: When a *particle and its antiparticle meet*, they destroy each
other to *produce 2 photons of equal energy*.
Here the minimum energy of each photon produced = hf(min) = rest
energy of the particle.
●● Antiparticle
Answer: *Equal rest mass* and *equal and opposite charge* to particle.
●● Atomic Number, Z
Answer: Number of *protons* in nucleus of atom.
●● Avogadro Constant
Answer: The *number of atoms in 12g of carbon-12*. Used to define the
mole.
●● Back emf
Answer: The emf induced in the spinning coil of electric motor or in any
coil in which the current is changing. A back emf acts against the change
of applied pd.
, ●● Background Radiation
Answer: *Radiation due to naturally occurring substances* in the
environment e.g. radon gas, cosmic rays, ground and buildings.
●● Binding Energy
Answer: *Work done* to separate a nucleus into its *constituent
nucleons* (neutrons and protons).
E = mass defect x c²
●● Binding Energy per Nucleon
Answer: Average work done per nucleon to separate nucleus into
constituent parts. Higher the value, the more stable the nucleus.
*BE per nucleon = BE of a nucleus / mass number*.
●● Boyle's Law
Answer: For a *fixed mass of gas* at a *constant temperature*, its
*pressure x volume is constant*. Gases that obey this are an ideal gas.
●● Boltzmann Constant (k)
Answer: Molar gas constant divided by Avogadro number.
●● Brittle
