Mechanics and Thermal Physics
Electricity and Magnetism
Nuclear and Quantum Physics
Waves, Energy and Power
Astrophysics and Quantum Physics
100
What is the work done if a force of 50N is applied on an object and moves the object fully around a circular track of radius 5m?
0J
100
What is the work done by a magnet with a magnetic field of 50T acting on a moving proton through a distance of 10nm?
0J
100

What is the mass deficit (in kg) in a nuclear fission reaction if the energy released in the reaction was 0.05 eV?

8.9 x 10-38 kg

100

A motor is used to lift a 2kg mass to a height of 8m. The motor uses a 650 V power supply and has a constant resistance of 755 ohms. What is the efficiency of the motor?

28% or 0.28

100

What ensures a star remains on the main sequence?

Outward radiation pressure equals inward gravitational pressure/force

200
The acceleration of free fall of a small sphere of mass 0.005kg when close to the surface of Jupiter is 25m/s^2. The gravitational field strength at the surface of Jupiter is... A. 0.0002N/kg B. 0.13N/kg C. 25N/kg D. 5000N/kg
C. 25N/kg
200
What is the electric field within a negatively charged conducting sphere of charge -16000C at a distance of 5cm from the center of the sphere and 10cm from the surface of the sphere?
0N/C
200
What is the standard definition for the unified mass unit?
(1/12) of the mass of a carbon-12 atom
200
What is the wavelength of a 5th harmonic wave in a pipe of length L that is open on one end and closed on the other?
(4/9)L
200
The parallax angle from Fomalhaut is 0.148 arcseconds. What is the distance in light years to Fomalhaut?
22 light years
300
A lead bullet is fired into an iron plate, where it deforms and stops. As a result, the temperature of the lead increases by an amount T. For an identical bullet hitting the plate with twice the speed, what is the best estimate of the temperature increase? A. T B. 2T C. sqrt(2)T D. 4T
D. 4T
300
For a light dependent resistor, if light is shining on the LDR will the resistance be lower or higher than normal?
A. Higher B. Lower C. No change
300

Show through algebra that the density of a nucleus is always the same.

m = N mn

R = R0A1/3

V = 4/3 pi R3

300
What is the angle of diffraction for a wave of 59nm through a circular aperture of diameter 20cm?
3.6 x 10^(-7)
300
The peak absolute magnitude of a star is -2.34 and the distance from Earth is 142pc. What is the apparent magnitude of the star?
3.42
400
When the volume of a gas increases it does work. The work done would be greatest for which one of the following processes? A. Isobaric B. Adiabatic C. Isothermal D. The work done would be the same for all of the above
A. Isobaric
400
A piece of wire has a resistivity of p, radius of r, and length L. A second piece of wire has resitivity 2p, length 2L and radius 4r. What is the ratio of the resistance of the first piece of wire to the resistance of the second piece of wire? A. 2 B. 1/4 C. 1/2 D. 4
D. 4
400
Thorium-227 undergoes alpha decay with a half-life of 18 days to form radium-223. A sample of Th-227 has an inital activity of 320000Bq. Determine the activity of the remaining thorium-227 after 50 days.
45000Bq
400
An unpolarised beam of monochromatic light is incident on a plane air-glass interface. The refractive index of the glass is 1.50. Calculate the angle of incidence for the reflected ray to be completely plane polarised.
56.3 degrees
400

Derive the expression for distance of closest approach when determining the radius of a nucleus by firing alpha particles at it.

d=(2kZe2)/Ek

500
An ideal gas expands isothermally, absorbing a certain amount of energy Q in the process. It then returns to its original volume adiabatically. During the adiabatic process, the internal energy change of the gas will be A. Zero B. Equal to Q C. Smaller than Q D. Greater than Q
D. Greater than Q
500
The alternating voltage of peak value 300V is applied across a 50 ohm resistor. The average power dissipated in watts will be... A. zero B. 300^2 / 50 C. 300^2 / (50*sqrt(2)) D. 300^2 / (50*2)
D. 300^2 / (50*2)
500
The half-life of a radioactive isotope is 10 days. Calculate the fraction of a sample that remains after 25 days.
18.7%
500

A satellite surface of area 2.0 m22.0 m2 and emissivity 0.800.80 is at 320 K320 K. Its surroundings are at 300 K300 K. Using Pnet=εAσ(Th4−Tc4), what is the expression gives the net radiative power loss of the surface?

0.80(2.0)σ(3204−3004)

500

What is the gradient of a stopping voltage vs frequency graph equal to? (photoelectric effect)

h/e

M
e
n
u