NATIONAL DEPARTMENT OF EDUCATION – How to Pass Matric – Helping

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NATIONAL
                             SENIOR CERTIFICATE



                                     GRADE 12



                      PHYSICAL SCIENCES: PHYSICS (P1)

                                  NOVEMBER 2009


MARKS: 150

TIME: 3 hours




              This question paper consists of 16 pages and 3 data sheets.




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Physical Sciences/P1                         2                             DoE/November 2009
                                            NSC



INSTRUCTIONS AND INFORMATION

1.        Write your examination number and centre number in the appropriate spaces
          on the ANSWER BOOK.

2.        Answer ALL the questions.

3.        This question paper consists of TWO sections:

          SECTION A (25)
          SECTION B (125)

4.        Answer SECTIONS A and B in the ANSWER BOOK.

5.        Non-programmable calculators may be used.

6.        Appropriate mathematical instruments may be used.

7.        Number the answers correctly according to the numbering system used in this
          question paper.

8.        Data sheets are attached for your use.

9.        Give brief motivations, discussions, et cetera where required.




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Physical Sciences/P1                         3                            DoE/November 2009
                                            NSC



SECTION A

Answer this section in the ANSWER BOOK.

QUESTION 1: ONE-WORD ITEMS

Give ONE word/term for each of the following descriptions. Write only the word/term
next to the question number (1.1  1.5) in the ANSWER BOOK.

1.1       The rate of change of momentum                                                      (1)

1.2       Motion of an object near the surface of the earth under the influence of the
          earth's gravitational force alone                                                   (1)

1.3       The phenomenon that causes dispersion of white light when it passes
          through a triangular prism                                                          (1)

1.4       The law which relates the current in a resistor, maintained at constant
          temperature, to the potential difference across its ends                            (1)

1.5       The source of an intense narrow beam of coherent monochromatic light                (1)
                                                                                              [5]


QUESTION 2: FALSE ITEMS

Each of the five statements below is FALSE. Correct each statement so that it is
TRUE. Write only the correct statement next to the question number (2.1  2.5) in the
ANSWER BOOK.

NOTE:     Correction by using the negative of the statement, for example, ''... IS NOT
          ...'', will not be accepted.

2.1       The work done by a non-zero net (resultant) force on an object, moving on a
          horizontal plane, is equal to the change in the potential energy of the object.     (2)

2.2       When a bird, flying at a velocity of 10 ms-1 east, encounters a wind blowing
          at 8 ms-1 west, its velocity relative to an observer on the ground is
          18 ms-1 west.                                                                      (2)

2.3       The number of bright bands per unit length observed in an interference
          pattern on a screen, will increase when the wavelength of the waves passing
          through a double slit increases.                                                    (2)

2.4       A lamp functioning at peak voltage (AC) will glow with the same brightness
          when connected to a battery of the same voltage (DC).                               (2)

2.5       Monochromatic light has photons of different energies.                              (2)
                                                                                              [10]


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Physical Sciences/P1                               4                        DoE/November 2009
                                                  NSC



QUESTION 3: MULTIPLE-CHOICE QUESTIONS

Four options are provided as possible answers to the following questions. Each
question has only ONE correct answer. Write only the letter (A  D) next to the
question number (3.1  3.5) in the ANSWER BOOK.

3.1       A person dives from a high platform into a pool. At which ONE of the
          positions A, B, C or D will the magnitude of his momentum be a maximum?
                                                  C
                                                  



                                              D


                                                      B



                                                      A

          A     Position A
          B     Position B
          C     Position C
          D     Position D                                                                      (2)

3.2       The sketch graph below may be used to calculate the impulse of a constant
          net force of 100 N that acts on an object over a period of time.
                             Fnet (N)




                                        100




                                          0                         t (s)
                                              1             10

          Which ONE of the following can be used to calculate the impulse (in kgms-1)
          of the force for the time interval t = 1 s to t = 10 s?

          A     100 x 1
          B     100 x 10
          C     100 x 9
          D     10 x 9                                                                          (2)




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Physical Sciences/P1                           5                             DoE/November 2009
                                              NSC



3.3       A listener moves at constant velocity towards a stationary source of sound.
          The frequency of sound heard by the listener is higher than the frequency of
          the sound emitted by the source, because ...

          A     the wavelength observed by the listener becomes shorter.
          B     the wavelength observed by the listener becomes longer.
          C     more wave fronts reach the listener per second.
          D     less wave fronts reach the listener per second.                                  (2)

3.4       A potential difference V is applied across two identical, parallel plates a
          distance y apart, as shown in the diagram below. The magnitude of the
          electric field between the plates is E.



                                        y                                V



          Which ONE of the following changes to the above arrangement will result in
          an electric field of magnitude 2E?

                Potential difference     Distance between plates
          A              2V                          2y
                                                     1
          B              2V                          2
                                                       y
          C               V                          2y
                                                     1
          D               V                          2
                                                       y                                         (2)

3.5       A line emission spectrum is formed when electrons in an atom, that moves
          from ...

          A     higher to lower energy levels, emit energy as light.
          B     higher to lower energy levels, absorb light energy.
          C     lower to higher energy levels, emit energy as light.
          D     lower to higher energy levels, absorb light energy.                              (2)
                                                                                                 [10]

                                                                       TOTAL SECTION A:          25




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