Physical Sciences Break 1.0

physics_all-papers-and-memorandums.zp124330

Physical Sciences GR 12 Exam Guidelines 2015 Eng

physics_all-papers-and-memorandums.zp124330

Physical Sciences

Grade 12 November Examination Preparation

Time: 3 hours

Marks: 150

Question                                           marks

1. One-word items                              5
2. Multiple choice                               20

• Vertical Projectiles:                         13

Bouncing Balls

• Work, Energy and Power                 12
• Conservation of Mechanical            14

Energy

• Doppler Effect                                 9
• Electric Fields                                 10
• Diffraction of light                           8
• Capacitors                                      11
• Electrostatics                                  10
• Electric Circuits                               18
• Electric Motor                                 9
• Photo-electric effect                      11

Total         150

1. We suggest that you write this in the given time as if it were your final exam paper.
2. Ask someone else to mark it from the MEMO.
3. Refer to the HINTS and redo any questions you didn’t get full marks for.
4. For more practice, refer to the past papers issued by the Department of Basic Education.

SECTION A

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.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 type of energy an object has due to its position above the ground. (1)
1.4. The phenomenon that takes place when two or more waves meet at a point. (1)
1.5. The law which relates the current in a resistor, maintained at constant temperature, to the potential difference across its ends. (1). 5 marks

QUESTION 2: 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.
2.1 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?
A Position A
B Position B
C Position C
D Position D (2)

2.2 The sketch graph 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.
Which ONE of the following can be used to calculate the impulse (in kg∙m∙s–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)

2.3 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)

2.4. 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.

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

2.5 A line emission spectrum is formed when electrons in an atom move from …
A higher to lower energy levels, emitting energy as light.
B higher to lower energy levels, absorbing light energy.
C lower to higher energy levels, emitting energy as light.
D lower to higher energy levels, absorbing light energy. (2)