Advanced Physics 2: 2019 MCQ

Which sequence could show part of the evolution of a star like the Sun?

• 1→5→3

• 2→3→4

• 3→5→1

• 4→3→2

A mass is supported by a single spring as shown. The strain energy stored by the spring is E. The mass is then supported by two springs, each identical to the first spring, as shown. What is the total strain energy stored with two springs arranged in this way?

• ¼ E

• ½ E

• E

• 2E

In both nuclear fission and nuclear fusion there are changes in the binding energy per nucleon. This releases energy. Which row of the table correctly shows the change in binding energy per nucleon for both processes?

• A

• B

• C

• D

The radium isotope 226/88 Ra is unstable and undergoes a series of α and β⁻ emissions until a stable isotope of lead 206/82 Pb is formed. Which of the following nuclear equations correctly shows the number of α and β⁻ emissions?

• 226/88 Ra → 206/82 Pb + 3α + 8β⁻

• 226/88 Ra → 206/82 Pb + 4α + 5β⁻

• 226/88 Ra → 206/82 Pb + 5α + 4β⁻

• 226/88 Ra → 206/82 Pb + 5α + 6β⁻

Three polarising filters X, Y and Z, are placed in front of a source of unpolarised light. The planes of polarisation of the filters are initially parallel. Filter Y is rotated by 45° as shown. Filter Z is then rotated clockwise and the intensity of light emerging from Z is measured. Which angle of rotation of Z will result in the lowest intensity of light?

• 90°

• 135°

• 180°

• 225°

When light is incident on the surface of a metal, electrons may be emitted by the photoelectric effect. Observations of the photoelectric effect helped to establish that light can exhibit particle behaviour.

• A Emission of photoelectrons occurs immediately the surface is illuminated.

• B Photoelectrons are only emitted when the frequency of the light is more than a certain minimum value.

• C The maximum kinetic energy of the photoelectrons is independent of the intensity of the incident light.

• D When the intensity of the incident light increases, photoelectrons are emitted at a greater rate.

A star of diameter D and surface temperature T has luminosity L. What is the luminosity of a star of diameter D/2 and surface temperature 2T?

• L/4

• L

• 4L

• 16L

An object of volume V made from a material of density ρ₁ is placed into a fluid of density ρ₂. Which of the following gives the upthrust on the object?

• ρ₁Vg

• ρ₂Vg

• (ρ₂ - ρ₁)Vg

• (ρ₂ + ρ₁)/2 Vg

Electric and gravitational fields have a number of similarities and differences. An electric field is produced by a point charge and a gravitational field is produced by a point mass. Which of the following statements applies to both of these fields?

• A) The field causes a force on all particles.

• B) The force caused by the field can be attractive or repulsive.

• C) At a distance x from the centre of the field, field strength is proportional to x².

• D) At a distance x from the centre of the field, potential is proportional to 1/x.

A mass at the end of a spring is set into small amplitude simple harmonic motion. Which of the following graphs correctly shows the variation of velocity v of the mass with displacement x for one complete oscillation?

• Graph A: Straight line with negative slope passing through the origin

• Graph B: Upward opening parabola with vertex at the origin

• Graph C: Upward semicircle with diameter along the x-axis

• Graph D: Full ellipse centered at the origin