OCR PHYSICS A LEVEL EXAM WITH WELL
VERIFIED QUESTIONS AND ANSWERS||
GUARANTEED PASS|| ALREADY GRADED A+||
LATEST VERSION 2026
What is a couple? - ANSWER-A pair of equal and opposite forces acting on an
object with different lines of action.
How do you calculate the moment of a couple? - ANSWER-Force x
perpendicular distance between the lines of action of the forces.
What is a triangle of forces? - ANSWER-A vector diagram of the three forces
acting on an object in equilibrium.
What is a resultant/net force? - ANSWER-The vector sum of forces acting on
an object
What is the density of a substance? - ANSWER-mass per unit volume.
What are the units of density? - ANSWER-kgm⁻³
What is pressure? - ANSWER-Normal force acting per unit area
What is Archimedes principle? - ANSWER-The upthrust exerted on an object is
equal to the weight of fluid displaced
,What is p in the equation p = hρg - ANSWER-Pressure exerted by a fluid
What is ρ in the equation p = hρg - ANSWER-Density of the fluid
What is h in the equation p = hρg - ANSWER-Depth of the fluid
What is work done equivalent to? - ANSWER-Energy Transferred
What are the SI base units equivalent to the Joule? - ANSWER-kgm²s⁻²
When measuring the count rate of a radioactive source what must be taken into
account? - ANSWER-The background count rate / count rate with no source
present
How do you find the corrected count rate for a radioactive source from the
measured count rate. - ANSWER-measured count rate - background count rate
How far do alpha particles typically travel in air? - ANSWER-A few cm
What type of ionising radiation is stopped by a sheet of paper? - ANSWER-
Alpha radiation
Why are alpha particles strongly ionising? - ANSWER-They have a relatively
large mass and charge.
What is the range of beta particles in air? - ANSWER-Around 1m
,What type of radiation requires around 1-3mm of aluminium to stop it? -
ANSWER-Beta radiation
What type of radiation is the least ionising? - ANSWER-Gamma rays
Why is gamma the least ionising form of radiation? - ANSWER-It has no
charge.
What thickness of lead will stop a significant proportion of gamma rays? -
ANSWER-3-4cm
Why is ionising radiation dangerous? - ANSWER-It can damage living cells
and DNA.
What procedure is routinely used to minimise the dose when handling
radioactive sources in the lab? - ANSWER-Use tongs and hold it away from
your body.
What are the units of Young Modulus? - ANSWER-Pa OR Nm⁻²
When does the Young Modulus apply to a material? - ANSWER-When stress is
proportional to strain OR when it is obeying Hooke's law
How do you find the Young Modulus from a stress-strain graph? - ANSWER-
The gradient of the initial straight line region.
What material property does Young Modulus measure? - ANSWER-The
stiffness.
What is a brittle material? - ANSWER-A material the show only elastic
behaviour up to its breaking point, without plastically deforming.
, What is a polymeric material? - ANSWER-A material made from long chain
molecules.
What is Newton's 1st Law of motion? - ANSWER-An object will remain at rest
of move at a constant velocity unless acted upon by a resultant force
What is Newton's 3rd Law of motion? - ANSWER-When two objects interact
they exert forces on each other that are equal in magnitude, opposite in direction
and of the same type of force.
What is Newton's 2nd Law of motion? - ANSWER-Resultant force acting on an
object is proportional to its rate of change of momentum, and is in the same
direction.
What two sets of units can be used for momentum? - ANSWER-Ns OR kgms⁻¹
How is the momentum of an object calculated? - ANSWER-Mass × velocity
(p=mv)
What is the principle of conservation of momentum? - ANSWER-The total
momentum in a system of interacting objects is constant provided no external
force acts.
What is an elastic collision? - ANSWER-A collision in which kinetic energy is
conserved
What is an inelastic collision? - ANSWER-A collision in which some kinetic
energy is transferred to other forms
How is impulse calculated? - ANSWER-Force × time
VERIFIED QUESTIONS AND ANSWERS||
GUARANTEED PASS|| ALREADY GRADED A+||
LATEST VERSION 2026
What is a couple? - ANSWER-A pair of equal and opposite forces acting on an
object with different lines of action.
How do you calculate the moment of a couple? - ANSWER-Force x
perpendicular distance between the lines of action of the forces.
What is a triangle of forces? - ANSWER-A vector diagram of the three forces
acting on an object in equilibrium.
What is a resultant/net force? - ANSWER-The vector sum of forces acting on
an object
What is the density of a substance? - ANSWER-mass per unit volume.
What are the units of density? - ANSWER-kgm⁻³
What is pressure? - ANSWER-Normal force acting per unit area
What is Archimedes principle? - ANSWER-The upthrust exerted on an object is
equal to the weight of fluid displaced
,What is p in the equation p = hρg - ANSWER-Pressure exerted by a fluid
What is ρ in the equation p = hρg - ANSWER-Density of the fluid
What is h in the equation p = hρg - ANSWER-Depth of the fluid
What is work done equivalent to? - ANSWER-Energy Transferred
What are the SI base units equivalent to the Joule? - ANSWER-kgm²s⁻²
When measuring the count rate of a radioactive source what must be taken into
account? - ANSWER-The background count rate / count rate with no source
present
How do you find the corrected count rate for a radioactive source from the
measured count rate. - ANSWER-measured count rate - background count rate
How far do alpha particles typically travel in air? - ANSWER-A few cm
What type of ionising radiation is stopped by a sheet of paper? - ANSWER-
Alpha radiation
Why are alpha particles strongly ionising? - ANSWER-They have a relatively
large mass and charge.
What is the range of beta particles in air? - ANSWER-Around 1m
,What type of radiation requires around 1-3mm of aluminium to stop it? -
ANSWER-Beta radiation
What type of radiation is the least ionising? - ANSWER-Gamma rays
Why is gamma the least ionising form of radiation? - ANSWER-It has no
charge.
What thickness of lead will stop a significant proportion of gamma rays? -
ANSWER-3-4cm
Why is ionising radiation dangerous? - ANSWER-It can damage living cells
and DNA.
What procedure is routinely used to minimise the dose when handling
radioactive sources in the lab? - ANSWER-Use tongs and hold it away from
your body.
What are the units of Young Modulus? - ANSWER-Pa OR Nm⁻²
When does the Young Modulus apply to a material? - ANSWER-When stress is
proportional to strain OR when it is obeying Hooke's law
How do you find the Young Modulus from a stress-strain graph? - ANSWER-
The gradient of the initial straight line region.
What material property does Young Modulus measure? - ANSWER-The
stiffness.
What is a brittle material? - ANSWER-A material the show only elastic
behaviour up to its breaking point, without plastically deforming.
, What is a polymeric material? - ANSWER-A material made from long chain
molecules.
What is Newton's 1st Law of motion? - ANSWER-An object will remain at rest
of move at a constant velocity unless acted upon by a resultant force
What is Newton's 3rd Law of motion? - ANSWER-When two objects interact
they exert forces on each other that are equal in magnitude, opposite in direction
and of the same type of force.
What is Newton's 2nd Law of motion? - ANSWER-Resultant force acting on an
object is proportional to its rate of change of momentum, and is in the same
direction.
What two sets of units can be used for momentum? - ANSWER-Ns OR kgms⁻¹
How is the momentum of an object calculated? - ANSWER-Mass × velocity
(p=mv)
What is the principle of conservation of momentum? - ANSWER-The total
momentum in a system of interacting objects is constant provided no external
force acts.
What is an elastic collision? - ANSWER-A collision in which kinetic energy is
conserved
What is an inelastic collision? - ANSWER-A collision in which some kinetic
energy is transferred to other forms
How is impulse calculated? - ANSWER-Force × time
