Gravity and Motion
Normal force is the force that always;
(A) Opposes the total weight of an object vertical to a surface.
(B) Acts along an imaginary line perpendicular to a surface.
(C) Works on an object in a direction parallel to a surface.
(D) Resists the motion of an object along a surface.
(B) Acts along an imaginary line perpendicular to a surface.
Electromagnetic waves always
(A) require a medium to propagate.
(B) move at a speed of 3 ×108 m s−1.
(C) travel parallel to the direction of oscillation of charge.
(D) have an electric field and a magnetic field that are perpendicular to each other.
(D) have an electric field and a magnetic field that are perpendicular to each other.
Which moving object has an inertial frame of reference?
(A) a ball dropping off a balcony
(B) a boat slowing down to dock
(C) a plane travelling at a constant velocity
(D) a car driving at 150 km h−1 around a circular racetrack
(C) a plane travelling at a constant velocity
What key feature differentiates the Bohr model of the atom from the Rutherford model?
(A) a high-density nucleus
(B) neutrons in the nucleus
(C) electrons in specific orbitals
(D) a low-density cloud of electrons around the nucleus
(C) electrons in specific orbitals
The W boson mediates
(A) the gravitational force between masses.
(B) interactions of the strong force in the nucleus.
(C) repulsive forces in electromagnetic exchanges.
(D) the weak force responsible for the decay of particles.
(D) the weak force responsible for the decay of particles.
Newton's Law of Universal Gravitation can be described by the formula;
(A)𝐹𝑔 =𝑚𝑔
(B)𝐹 =4𝜋^2/𝐺𝑀
(C)𝐹 =𝐺𝑀𝑚/𝑟^2
(D)𝐹𝑛𝑒𝑡 =𝑚𝑣^2/𝑟
(C)𝐹 =𝐺𝑀𝑚/𝑟^2
Magnetic flux density is a quantity related to the
(A) rate of change of field lines moving through a given area.
(B) number of magnetic field lines per unit area.
(C) volume occupied by a magnetic field.
(D) mass charge ratio of a magnet.
(B) number of magnetic field lines per unit area.
A person on Earth experiences a time period of 15 years.
Approximately how much time will have passed for a passenger on a spaceship travelling at 0.7 c relative to
Earth during that time?
(A) 8 years
(B) 11 years
(C) 21 years
(D) 27 years
(B) 11 years
Identify the defining feature of a black body.
(A) All frequencies of electromagnetic radiation are absorbed and emitted.
(B) Light with two wavelength peaks is emitted at a specific temperature.
(C) Electrons are emitted in the presence of all frequencies of light.
(D) The peak of its spectral output does not vary with temperature.
(A) All frequencies of electromagnetic radiation are absorbed and emitted.
Mesons and baryons
(A) are elementary particles.
(B) contain quarks and antiquarks.
(C) consist of three elementary particles.
(D) are composite particles containing at least one quark.
(D) are composite particles containing at least one quark.
Which of the following is Kepler's laws of planetary motion?
(A) The laws of physics are the same in all inertial frames of reference
(B) All planets move about the sun in an elliptical orbits, having the sun as an one of the foci
(C) The speed of light in a vacuum has the same, c, in all inertial frames of reference
(D) The force of attraction between each pair of point particles is directly proportionate to the product of the masses inversely proportional to the square of the distance between them
(B) All planets move about the sun in an elliptical orbits, having the sun as an one of the foci
Which of the following is Lenz's Law?
(A) The total electric charge of an isolated system remains constant regardless of changes within the system.
(B) The magnetic flux around a current-carrying wire changes in proportion to the rate of change of the current.
(C) The direction of an induced electric current always opposes the change in the circuit or magnetic field that produces it.
(D) The ratio of the sines of the angles of incidence and refraction of a wave is constant when the wave passes between two given media.
(C) The direction of an induced electric current always opposes the change in the circuit or magnetic field that produces it.
Select the option that contains the two correct postulates of special relativity.
(A) The laws of physics are the same in all inertial frames of reference and the speed of light in a vacuum has the same value c in all inertial frames of reference.
(B) The laws of physics are the same in all inertial frames of reference and the relation between two events is assumed to happen at the same time in all inertial frames of reference.
(C) The relation between two events is assumed to happen at the same time in all inertial frames of reference and the laws of physics are not the same in all inertial frames of reference.
(D) The relation between two events is assumed to happen at the same time in all inertial frames of reference and the speed of light in a vacuum has the same value c in all inertial frames of reference.
(A) The laws of physics are the same in all inertial frames of reference and the speed of light in a vacuum has the same value c in all inertial frames of reference.
Light with a frequency of 9.4 x 10'5 Hz is incident upon an unknown metal, producing photoelectrons with a maximum kinetic energy of 5.6 × 10- J.
What is the work function of the metal?
(A) 1.0 eV
(B) 3.9 eV
(C) 5.9 eV
(D) 6.3 eV
(B) 3.9 eV
The correct definition of the term antiparticle is
(A) a particle with a known substructure.
(B) a particle with no known substructure.
(C) a particle with the same mass and opposite charge and/or spin as a corresponding particle.
(D) a particle with a different mass and the same charge and/or spin as a corresponding particle.
(C) a particle with the same mass and opposite charge and/or spin as a corresponding particle.
Select the words that correctly complete the description of uniform circular motion.
The motion of an object travelling at a ____________ ____________ acting on the object in a _________ __________ direction to the velocity of the object.
(A) varied speed, parallel
(B)varied acceleration, parallel
(C)constant speed, perpendicular
(D)constant velocity, perpendicular in a circle due to a force
(C)constant speed, perpendicular
A solenoid with 24 loops of wire produces an EMF of 36 V during a magnetic flux change of 0.3 Wb.
Calculate the period during which the magnetic flux varied.
0.2 s
A rocket with a velocity of 0.9 c journeys from Earth to a distant planet. An observer on Earth measures the journey to have taken 3.00 years. Calculate the time taken for the journey as measured by a clock on the rocket.
1.31 years
Which model of the atom would predict the continuous emission of electromagnetic energy, resulting in the instability of the atom?
(A) Bohr's model of the atom
(B) Dalton's model of the atom
(C) Rutherford's model of the atom
(D) Thomson's plum pudding model of the atom
(C) Rutherford's model of the atom
Name all 6 quarks and 6 leptons
quarks- up, down, top, bottom, charm, strange
leptons- electron, electron neutrino, muon, muon neutrino, tau, tau neutrino
Select the two formulas that, along with V = T", can be used to derive Kepler's third law of planetary motion.
(A) Fg=mg and g = f/m
(B) F=GMm/r^2 and Fg= mg
(C) ac = v^2/r and Fnet =mv^2/r
(D) F =GMm/r^2 and Fnet = mv^2/r
(D) F =GMm/r^2 and Fnet = mv^2/r
A Magnet is passed through a solenoid comprising five turns and a cross-sectional area of 0.60 m' to produce an EMF of 0.75 V.
Calculate the EMF if the same magnet passes through another solenoid with three times as many turns and half the cross-sectional area at the same rate.
1.1 V
Which of the following is a correct consequence of the speed of light in a vacuum being the same for all observers?
(A) The frame of reference of the observer is always the real frame of reference.
(B) Observations of events in distant galaxies are observations of events that occurred in the past.
(C) A clock that is moving relative to an observer will tick faster than a clock that is at rest in the observer's own frame of reference.
(D) When measured by a stationary observer, the length of a moving object is smaller than the length of the object when it is measured in its own frame of reference.
(D) When measured by a stationary observer, the length of a moving object is smaller than the length of the object when it is measured in its own frame of reference.
Young's double slit experiment provides evidence for the wave model of light. Identify one piece of evidence and explain why this supports the wave model of light.
-identifies one piece of evidence
-identifies that this is a characteristic of wave behaviour
Example: One piece of evidence is the bright and dark bands. This shows that there is interference which is a property of waves.
Which two gauge bosons mediate the weak nuclear forces?
W bozon and Z bozon