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WorksheetsPhysics PSPM2 Paper1_40 Objective
Total questions: 40
Worksheet time: 20mins
Three charges + q, + Q and – Q are placed at the corners of an equilateral triangle. The net force on charge + q due to the other two charges is FIGURE 1
A. vertically up.
B. vertically down
C. horizontal to the left.
D. horizontal to the right.
2. FIGURE 2 shows a charge 2Q is located at the origin while a second charge – Q is located at x = a . Where should a third positive charge be placed so that the net force on the charge is zero?
A. x < 0
B. 0 < x < a
C. x > a
D. x < 0 OR 0 < x < a
3. A positive charge that is in an electric field E experiences a force that is
A. perpendicular to E .
B. zero because the speed is zero.
C. in the opposite direction to E .
D.in the same direction as E .
4. The concept of electric potential difference is most closely associated with
A. the mechanical force on an electron.
B. the resistance of a certain specified column of mercury.
C. the charge on one electron.
D. the work per unit quantity of charge.
5. In a uniform electric field, a proton has
A. a constant velocity in the direction of the field.
B. a constant velocity in the direction opposite to that of the field.
C. a constant acceleration in the direction of the field.
D. a constant acceleration in the direction opposite to that of the field.
6. As the voltage in the circuit is increased, the capacitance
A. increases.
B. decreases.
C.does not change.
D.does none of these.
7. The capacitance of a parallel–plate capacitor
A. decreases if a dielectric is placed between its plates.
B. is independent of the distance between the plates.
C. has units of J C−1 .
D. is independent of the charge on the capacitor.
8. If 4.70 × 1016 electrons pass a point in a wire every second, what is the current in the wire?
A.4.70 mA
B.3.67 mA
C.2.95 mA
D.7.52 mA
A
B
C
D
9. The resistivity of any given metal
A. depends on its temperature.
B. varies linearly with temperature.
C. has units of Ohm–meter.
D. is described by all of the above.
A
B
C
D
10. The graph in FIGURE 3 below shows the potential difference across a resistor as a function of the current through the resistor. The slope of the resulting curve represents
A. power
B. resistance
C. e.m.f.
D. charge
A resistor carries a current I. The power dissipated in the resistor is P. What is the power dissipated
if the same resistor carries current 3I?
A. P
B. 3P
C.P/3
D. 9P
12. In a circular loop of wire lying on a horizontal floor, the magnetic field has a clockwise direction from topview.
The accompanying current at the centre of the circle is directed
A. horizontally and to the east.
B. horizontally and to the north.
C. parallel to the floor.
D. vertically downward.
13. The circuit in FIGURE 4 below contains a battery and a resistor in series. Which one of the following statements is FALSE?
C. The rate of heating in the external resistor is 10 W.
A. The current in the circuit is 2 A.
B. The battery is supplying energy to the circuit at the rate of 6W.
C. The rate of heating in the external resistor is 10 W.
D. The battery is being discharged.
14. When the positive current in a long wire is flowing in a direction from South to North, it creates a magnetic field below the wire that is directed
A. from East to West.
B. from North to South.
C. from South to North.
D. from West to East.
A
B
C
D
15. Two wires lying in the plane of this page carry equal currents in the opposite direction as shown in FIGURE 5 below. At a point midway between the wires, the magnetic field is
A. zero.
B. into the page.
C. out of the page.
D. towards the top of the page.
16. According to Faraday's law, a necessary and sufficient condition for an electromotive force to be induced in a closed circuit loop is the presence in the loop of
A. a magnetic field.
B. magnetic materials.
C. an electric current.
D. a time–varying magnetic flux.
17. The instantaneous induced e.m.f. in a coil of wire located in a magnetic field
A. depends on the time rate of change of flux through the coil.
B. depends on the instantaneous value of flux through the coil.
C. is independent of the area of the coil.
D. is independent of the number of turns of the coil.
18. Which law does the following statement express?
In all cases of electromagnetic induction, the induced voltages have a direction such that the currents they produce oppose the effect that produces them.
A. Coulomb’s law
B. Fleming's rule
C. Lenz's law
D. Ampère's law
19. The self–inductance of a wire coil is a proportionality constant that relates
A. electric field to current.
B. electric force to current.
C. magnetic flux to current.
D. magnetic field to current.
A
B
C
D
20. The r.m.s. value of a house voltage is 220.00 V. What is the maximum voltage?
A. 440.00V
B. 311.13 V
C.110.00 V
D.155.56 V
21. Refer to FIGURE 6 below. As the frequency in this simple a.c. circuit increases, the r.m.s. current through the resistor
A. increases.
B. decreases.
C. does not change.
D. none of the above.
22. Which one of the following statements about a capacitor that is connected to an a.c. voltage is TRUE?
A. The average power dissipated by the capacitor is zero.
B. At low frequencies the capacitor behaves like an open circuit.
C. At high frequencies the capacitor behaves like a short circuit.
D. At any given instant the net charges on the capacitor is zero.
23. Refer to FIGURE 7 below. When the frequency of the circuit is increased from zero,
A. the impedance increases to a maximum and then decreases.
B. the impedance decreases to a minimum and then increases.
C. the impedance will decrease continuously.
D. the impedance does not change.
24. When an object is closer to a concave mirror than the mirror's focal point (u<f), the
A. the magnification is less than one
B. the image is inverted.
C. the magnification is equal to one.
D. the image distance is negative.
25. Refer to FIGURE 8 below. An object is placed in front of a plano–concave lens at r1/2 . The image produced by the lens is
A. inverted, real and diminished.
B. inverted, virtual and magnified.
C. upright, virtual and diminished.
D. upright, virtual and magnified.
Two coherent sources of monochromatic light are located at S1 and S2 as shown. If the sources are in phase, the intensity at point P is a maximum when
d = λ
r2 + r1 = λ
r2 − r1 = λ
r2 + r1 = λ
27. Which one of the following statements about Young's double–slit experiment is FALSE?
A. The bands of light are caused by the interference of light coming from the two slits.
B. The results of the double–slit experiment support the particle theory of light.
C. Double–slit interference patterns can also be produced with sound waves and water waves.
D. If the slits are moved closer together, the bands of light on the screen are spread farther apart.
A
B
C
D
28. When a parallel beam of light is diffracted at a single slit,
A. the shadow is always sharp.
B. the narrower the slit, the wider the central diffraction maximum.
C. the width of the central diffraction maximum is independent of the width of the slit.
D. none of these is correct.
A
B
C
D
29. The different colours seen on a soap bubble are produced by
A. the dispersion of light by the water in the soap.
B. the interference of light reflected from the front and the back of the soap film.
C. the different angles light strikes the surface of the soap film.
D. total internal reflection of light in the soap film.
A
B
C
D
30. In the photoelectric effect, the work function depends on
A. the incident wavelength.
B. the applied voltage.
C. the light intensity.
D. the metal that the light strikes.
A
B
C
D
31. Which one of the following experiment(s) illustrates the particle nature of light?
A. The Young's double–slit
B. The photoelectric effect
C. The electron diffraction
D. None of the above
A
B
C
D
32. Light falling on the surface of a metal such as caesium can liberate electrons from the metal. The kinetic energy of electrons emitted from a metal can be increased by
A. using light of higher frequency.
B. using light of lower frequency.
C. increasing the intensity of the incident light.
D. using a metal with a greater work function.
The graph in FIGURE 10 below shows the maximum kinetic energy of electrons emitted by a photosensitive surface as a function of the frequency of the incident radiation. The slope of this curve
represents
A. the stopping potential.
B. the maximum kinetic energy.
C. the threshold frequency.
D. the Planck's constant.
34. The Davisson–Germer experiment verified that
A. the velocity of light in a vacuum is a universal constant.
B. the waves have a particle aspect.
C. the electrons show wave characteristics.
D. the neutron does not have a charge.
A
B
C
D
35. If a baseball, an electron and a photon all have the same momentum, which one has the longest wavelength?
A. Baseball
B. Electron
C. Photon
D. All have the same wavelength
A
B
C
D
36. The sodium atom has an atomic number of 11 and an mass number of 23. The neutral atom contains
A. 11 neutrons and 12 protons.
B. 11 protons and 12 neutrons.
C. 12 electrons and 11 neutrons.
D. 23 protons and 12 electrons.
37. Which one of the following radioactive decay products has the largest electric charge?
A. Alpha particles
B. Beta particles
C. Gamma rays
D. Neutrons
A
B
C
D
38. A particle and its antiparticle must have
A. opposite spins.
B. opposite charges.
C. opposite masses.
D. opposite forces.
A
B
C
D
39. Leptons
A. are less massive than the lightest hadron.
B. include electrons, muons and neutrinos.
C. participate in the weak interaction.
D. all of these are correct.
A
B
C
D
- Half life is the time taken for
the total nuclei decays into 0.5 of the initial value
the activities left 50% of the initial value
the remaining nuclei is 1/2 of the initial value
all the above
