Physics Test
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1. By definition, the electric displacement current through a surface S is proportional to the
magnetic flux through S.
rate of change of the magnetic flux through S.
time integral of the magnetic flux through S.
electric flux through S.
rate of change of the electric flux through S.
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2. Which of the following is true about any system that undergoes a reversible thermodynamic process?
There are no changes in the internal energy of the system.
The temperature of the system remains constant during the process.
The entropy of the system and its environment remains unchanged.
The entropy of the system and its environment must increase.
The network done by the system is zero.
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3. For which of the following thermodynamic processes is the increase in the internal energy of an ideal gas equal to the heat added to the gas?
Constant temperature
Constant volume
Constant pressure
Adiabatic
Cyclic
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4. Light of variable frequency v shines on the metal surface of a photoelectric tube. Einstein’s theory of the photoelectric effect predicts that the
work function of the metal is proportional to the frequency.
work function of the metal is proportional to the wavelength.
current in the tube is a linear function of the wavelength.
potential difference necessary to stop the emitted electrons is a linear function of the frequency above the threshold frequency.
potential difference necessary to stop the transmitted current, is a linear function of the frequency above the threshold frequency.
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5. Characteristic X rays, appearing as sharp lines on a continuous background, are produced when high-energy electrons bombard a metal target. Which of the following processes results in the characteristic X rays?
Electrons producing Čerenkov radiation.
Electrons colliding with phonons in the metal.
Electrons filling inner shell vacancies that are created in the metal atoms.
Electrons combining with protons to form neutrons.
Electrons undergoing Coulomb scattering with nuclei.
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6. Which of the following quantities is not a vector quantity?
force
area
displacement
velocity
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7. Which of the following quantities is not a scalar quantity?
speed
your age
volume
acceleration
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8. Which of the following statements about the motion of an object on which unbalanced forces act is false?
The object could continue moving at constant speed in a straight line.
The object could accelerate.
The object could slow down.
The object could change the direction in which it is moving
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9. A ball is moved vertically upwards in the air Which of the following statements about the motion of the ball is false?
The ball will be travelling as fast as it was when it gets back to the ground as it was when first thrown upwards.
The ball will be stationary for an instant at the highest point in its flight.
The direction of the force on the ball changes so the ball falls back to the ground.
The direction of the acceleration is always downwards.
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10. Which of the following is not used to protect us from the possibility of receiving an electric shock?
Double insulation
Live wire
Earth wire
Circuit breaker
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11. Which of the following is true for a negatively charged object?
It will attract another negatively charged object.
It has too few electrons.
It has too many neutrons.
It has gained extra electrons.
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12. Which of the following is true for a negatively charged object?
It will attract another negatively charged object.
It has too few electrons.
It has too many neutrons.
It has gained extra electrons.
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13. Which of the following is true for all parallel circuits?
Parts of the circuit can be turned off while other parts remain on.
The current is the same in all parts of the circuit
There is only one path for the current to follow.
There are no junctions or branches.
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14. When a voltage of 6V is applied across a resistor there is a current of 0.1A. The value of the resistor is
6Ω.
60Ω
16.6Ω
0.6Ω
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15. Which of the following does not move as a transverse wave?
Ultraviolet Light
Sound Wave
Surface Water Wave
Microwave
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16. Which of these effects describes the change in pitch we hear when a fast moving motorbike goes past?
Total internal reflection
Refraction
Reflection
Doppler
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17. Which of the following does not make use of total internal reflection?
Oscilloscope
Endoscope
Prismatic Periscope
Optical Fibres
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18. A fluorescent lamp is 25% efficient. Choose the statement that correctly describes how the lamp performs.
The lamp only works for a quarter of the time.
25% of the electrical energy transferred to the lamp is wasted.
The lamp does not work properly.
25% of the energy supplied to the lamp is transferred to light.
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19. A uses energy stored in chemical form in petrol. When the engine is running this energy is transferred to other types of stored energy. Which of the following energy stores is useful?
Noise
Heat
Movement
Hot exhaust gases
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20. Which of the following materials is good thermal conductor?
Glass
Aluminium
Air
Water
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21. Which of the following statements about thermal radiation is false?
It cannot travel through glass.
It can travel through a vacuum.
It travels at the speed of light.
It is absorbed by black objects better than shiny ones.
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22. Four students A, B, C and D, measure their power output by running upstairs and timing how long it takes. Which of the four students has the greatest power output?
Mass of 50 kg, takes 20s to gain a height of 10m.
Mass of 40 kg, takes 30s to gain a height of 15m.
Mass of 45 kg, takes 10s to gain a height of 5m.
Mass of 55 kg, takes 25s to gain a height of 15m.
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23. A rectangular block of metal of density 8000 kg/m³ measures 2 cm by 3 cm by 10 cm. What is the mass of the block?
48 g
O,48. kg
4,8 kg
48 kg
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24. Which of the following will exert the greatest pressure when standing on the ground?
An elephant: weight 50 000 N, area of one foot 0.2 m²
Atmospheric pressure: 10⁵ Pa
Ballerina: weight 450 N, area 0.0015 m²
Man: weight 800 N, area of one foot 0.025 m²
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25. Which of the following descriptions most accurately describes a gas?
Very low density, easily compressed, cannot flow.
High density, cannot be compressed, definite shape.
Very low density, easily compressed, expands to fill available space.
High density, difficult to compress, can flow.
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26. The specific heat capacity of a liquid is
the amount of heat energy required to make 1 kilogram of the liquid boil.
the amount of heat energy required to raise the temperature of 1 kilogram of the liquid by 1 °F.
the amount of heat energy required to raise the temperature of 1 kilogram of the liquid 1 °C.
the amount of heat energy required to raise the temperature of 1000 cm³ of the liquid by 1 °C.
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27. Boyle's law states that
if you double the pressure on a gas its volume doubles.
if you double the pressure on a gas its temperature halves.
if you double the pressure on a gas its volume doubles provided the temperature is constant.
if you double the pressure on a gas its volume halves provided its temperature is constant.
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28. Which of the following objects is made from a magnetic material?
A rubber band
A piece of paper
A steel nail
A plastic ruler
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29. in which of these situations will you see attraction?
The north poles of two magnets are placed together.
A wooden rod is placed closed to a strong magnet.
The south poles of two magnets are placed close together.
The north pole of one magnet is placed close to the south pole of another magnet.
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30. Which of these statements is true for a magnetically hard material?
They are difficult to bend.
They are used to make permanent magnets.
They are electrical insulators.
They are used in electromagnets.
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31. Which of the following particles has the smallest mass?
Alpha
Neutron
Proton
Electron
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32. When a radioactive isotope emits an alpha particle its
atomic mass decreases and its atomic number decreases.
atomic mass increases and its atomic number decreases.
atomic mass decreases and its atomic number increases.
atomic mass is unchanged and its atomic number decreases.
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33. The emission of which of the following particles from a radioisotope causes it to change into the next element in the periodic table?
Positron
Electron
Neutron
Alpha
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34. A radioactive isotope has an activity of 1000 Bq: after 5 hours its activity has fallen to 125 Bq. The half-life of this isotope is
1 hour
75 minutes
125 minutes
2.5 hours
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35. Which of the following particles that may be emitted in radioactive decay is not ionising?
Alpha
Beta minus
Neutron
Beta plus
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36. Which of the following statements is incorrect?
Gravitational forces keep our Moon in orbit around the Earth.
Comets and moons orbit planets.
Planets orbit the sun.
Artificial satellites orbit a planet.
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37. Which of the following sequences might be followed by a star that has a mass much larger than our Sun?
Main sequence, stellar nebula, red giant, white dwarf
Stellar Nebula, Main sequence, red supergiant, black hole
Stellar Nebula, Main sequence, white dwarf, black hole
Main sequence, red giant, neutron star, white dwarf
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38. Which are the most common reactions that take place in the core of a star that is in the main sequence?
Nuclear fission reactions between helium nuclei.
Nuclear fission reactions between hydrogen nuclei.
Nuclear fusion reactions between helium nuclei.
Nuclear fusion reactions between hydrogen nuclei.
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39. Which of the following observations does not support the Big Bang theory?
Cosmic microwave background radiation.
Blue-shift in the spectra. of galaxies.
Red-shift in the spectra of galaxies.
Accelerating galaxies.
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