What is a statement of the principle of conservation of momentum?
A force is equal to the rate of change of momentum of the object upon which it acts.
In an elastic collision, the relative momentum before impact is equal to their relative momentum after impact.
The momentum of an object is the product of the mass of the object and its velocity.
The total momentum of a closed system remains constant, providing no resultant external force acts on the system.
When must an object be in equilibrium?
when no resultant force acts on the object
when no resultant force and no resultant torque act on the object
when no resultant torque acts on the object
when the upward force on the object is equal and opposite to its weight
Which statement about elastic and plastic deformation must be correct?
Elastic deformation and plastic deformation are proportional to the applied force.
Elastic deformation and plastic deformation cause no change in volume.
Elastic deformation causes heating of the material but plastic deformation does not.
Elastic deformation is reversible but plastic deformation is not.
Which statement about electromagnetic waves is correct?
A wave of wavelength 5.0 × 10–6 m is invisible to the human eye.
They can all travel at different speeds in free space.
They cannot be polarised.
They consist of vibrating atoms.
In double-slit experiment, the interference fringes are very close together. Which change would increase the distance between the fringes?
Increase the brightness of the light source.
Increase the distance between the slits and the screen.
Increase the distance between the two slits.
Increase the frequency of the light used.
What is the definition of the potential difference (p.d.) across a component?
the electrical power supplied to the component
the energy transferred to the component per unit charge
the product of the current in the component and its resistance
the voltage across the component
A nucleus of an element emits an α-particle, then a β– particle and then another β– particle.Which statement describes the final element that is produced?
It is a different element of higher proton number than the original element.
It is a different element of lower nucleon number than the original element.
It is an isotope of the original element.
It is the same element as the original element but with a different proton number.
Which term represents a physical quantity?
metre
percentage uncertainty
quark flavour
spring constant