NATIONAL CERTIFICATE (VOCATIONAL) PHYSICAL SCIENCE (First Paper) NQF LEVEL 2 SUPPLEMENTARY EXAMINATION 2010

Transcription

1 NTIONL CERTIFICTE (VOCTIONL) PHYSICL SCIENCE (First Paper) NQF LEVEL 2 SUPPLEMENTRY EXMINTION 2010 ( ) 9 March (Y-Paper) 13:00 16:00 Suitable mathematical instruments may be used. Non-programmable calculators may be used. This question paper consists of 10 pages, a 1-page formula sheet and a 2-page answer sheet.

2 ( ) -2- NC1790(E)(M9)V TIME: 3 HOURS MRKS: 150 INSTRUCTIONS ND INFORMTION Write your EXMINTION NUMBER and EXM CENTRE NUMBER (if applicable) in the spaces provided on the NSWER SHEET and NSWER BOOK. nswer LL the questions. nswer SECTION on the attached NSWER SHEET. nswer SECTION B in the NSWER BOOK. In LL calculations, formula and substitutions must be shown. Read LL the questions carefully. LL final answers must be accurately approximated to TWO decimal places. Number the answers according to the numbering system used in this question paper. Write neatly and legibly.

3 ( ) -3- NC1790(E)(M9)V SECTION nswer this section on the attached NSWER SHEET. QUESTION 1: ONE-WORD NSWERS Give ONE word/term for ECH of the following descriptions/situations. Write only the word/term next to the question number ( ) on the attached NSWER SHEET The flow of charge in one direction only The ratio of the output energy of a machine to its input energy The energy difference between two points in an electrical circuit The angle at which a ray reflects at exactly 90 to the normal The time taken for one oscillation [5] QUESTION 2: MTCHING ITEMS Choose an item from COLUMN B that matches a description in COLUMN. Write only the letter ( H) next to the question number ( ) on the attached NSWER SHEET. COLUMN COLUMN B 2.1 Density volt 2.2 Weight B kg m Potential difference C newton 2.4 Frequency D coulomb 2.5 Electric charge E kg m -2 F G H ampere hertz joule

4 ( ) -4- NC1790(E)(M9)V QUESTION 3: TRUE OR FLSE Indicate whether the following statements are TRUE or FLSE. Choose the answer and write only 'true' or 'false' next to the question number ( ) on the attached NSWER SHEET The speed of sound in a vacuum is 300,000 m s -1. Light is a transverse wave. On Earth, the gravitational acceleration depends upon the mass of an object. fuse is used in an appliance to prevent too much voltage from flowing through the appliance. The kinetic energy of an object is the energy it possesses because of its motion. [10] QUESTION 4: MULTIPLE-CHOICE QUESTIONS Various options are given as possible answers to the questions below. Each question has only ONE correct answer. Choose the correct answer to the question and make a CROSS (X) in the block next to the question number ( ) on the attached NSWER SHEET. 4.1 n athlete runs on a circular track and completes a lap of 400 m in 50 s. Her average velocity during those 50 s is B C D 8 m s -1 0 m s -1 1,6 m s -1 0,16 m s The approximate weight of an object of mass 21 kg is B C D 2,1 N 21 N 210 N N 4.3 stone is dropped from the top of a tall building. fter 1 s the stone will have than it had at the top of the building. B C D greater gravitational potential energy less kinetic energy greater kinetic energy less mechanical energy

5 ( ) -5- NC1790(E)(M9)V 4.4 Rubbing a glass rod with a silk cloth positively charges the glass rod. During this process B C D electrons are transferred from the glass rod to the silk cloth. electrons are transferred from the silk cloth to the glass rod. protons are transferred from the silk cloth to the glass rod. protons are transferred from the glass rod to the silk cloth. 4.5 Eskom provides houses with alternating current electricity. In these household electric circuits B C D current magnitude is fixed but direction changes. current magnitude changes but direction is fixed. both current magnitude and direction are fixed. both current magnitude and direction change. [15] TOTL SECTION : 35

6 ( ) -6- NC1790(E)(M9)V SECTION B QUESTION 5: MESUREMENTS 5.1 Name the instrument you can use to measure the following quantities: Electric current Potential difference Weight Displacement 5.2 Convert the following quantities: km to m 9 µc to C 3 nv to V 150 mg to kg 740 mw to W [9] QUESTION 6: MECHNICS 6.1 car accelerates uniformly from rest. set of readings of the car's motion is recorded in the table below: Time (s) Speed (m s -1 ) Calculate the acceleration of the car between 0 s and 6 s. What is the speed of the car after 5 s? Calculate the displacement of the car during the first 6 s. Calculate the time taken for the car to reach 20 m s -1. Convert 20 m s -1 to km hr -1. (4) (4) (4)

7 ( ) -7- NC1790(E)(M9)V 6.2 picture hangs on a wall and is suspended by two wires. The two wires form an angle of 90 to each other. By means of a calculation determine the mass of the picture. 10 N 10 N picture 6.3 car moving at a constant velocity of 16 m s -1 approaches a red robot. The driver applies the brakes and the car decelerates uniformly for 100 m before coming to a halt at the robot. Calculate the deceleration of the car as it approaches the robot. (4) [26] (6) QUESTION 7: MECHNICL DVNTGE Give ONE example of each of the three types of levers. The mechanical advantage obtained when making use of a crowbar is 10. What effort will be required to lift an object with a mass of 50 kg? (6) [9] QUESTION 8: MECHNICL ENERGY State, in words, the principle of conservation of mechanical energy. worker standing on a scaffold 20 m above the ground drops a 5 kg box. Calculate the following: The maximum gravitational potential energy of the box The kinetic energy of the box just before it strikes the ground The velocity of the box just before it strikes the ground (4) (5) [14]

8 ( ) -8- NC1790(E)(M9)V QUESTION 9: WVES, SOUND ND LIGHT 9.1 The diagram below shows a length of string (L) fixed at one end (point Q). The string is shaken to and fro at point P, until a standing wave of one loop is formed. L P Q Name THREE conditions necessary for the formation of standing waves. Draw a diagram in your answer book showing the standing wave pattern formed if the frequency is TWO times greater than above. What do the nodes and anti-nodes represent? (4) 9.2 The following diagram shows an incident ray of light striking the interface between air and a glass block IR GLSS What is the size of the angle of incidence? What is the size of the angle of refraction? Copy the diagram into your answer book and show the path of the light ray as it passes back out into the air. Label your diagram. (6) 9.3 The frequency of a sound wave produced by a device is 110 Hz and its wavelength is 3 m. Calculate the speed of the wave. (4) [23]

9 ( ) -9- NC1790(E)(M9)V QUESTION 10: MGNETISM ND ELECTROSTTICS 10.1 The diagram below represents a bar magnet. N S Copy the diagram into your answer book and draw in the magnetic field pattern. Where is the magnetic field the strongest? 10.2 Explain the following terms: Magnetic declination Magnetic shielding 10.3 Two spheres and B have charges of -3, C and +9, C respectively. The two spheres are allowed to touch each other Calculate the new charge on each sphere. Will the force between the two spheres be one of attraction or repulsion? Give a reason for your answer. Is it possible for an object to have a charge of -4, C? Explain your answer. [17]

10 ( ) -10- NC1790(E)(M9)V QUESTION 11: ELECTRICITY Three light bulbs with resistances as shown are connected in parallel. Four identical cells each with a voltage of 1,5 V are connected in series. n ammeter, voltmeter and connecting wires complete the circuit. The internal resistance of the cells can be ignored. Each cell = 1.5 1,5 V 5 Ω 5 Ω 10 Ω V Calculate the total EMF of the battery. Calculate the resistance of the circuit. What will be the reading on the ammeter? What is the reading on the voltmeter? The 10 Ω light bulb breaks Calculate the new reading on the ammeter. What is the new reading on the voltmeter? (5) [17] TOTL SECTION B: 115 GRND TOTL: 150

11 ( ) -11- NC1790(E)(M9)V NTIONL CERTIFICTE (VOCTIONL) PHYSICL SCIENCE LEVEL 2 PPER 1 (PHYSICS) TBLE 1: PHYSICL CONSTNTS NME SYMBOL VLUE cceleration due to gravity g 9,8 m.s -2 Speed of light in vacuum c 3,0 x 10 8 m.s -1 TBLE 2: FORMULE MECHNICS v = u + at E k = ½ mv 2 v 2 = u 2 + 2as E p = mgh S = ut + ½ at 2 M = load / effort S = ½(v+u)t VR = effort distance / load distance F = mg W = F x S Efficiency = M / VR WVES, SOUND ND LIGHT V = f λ T = 1/f MGNETISM ND ELECTRICITY R = r 1 + r 2 + r 3 Q = It 1/R = 1/r 1 +1/ r 2 + 1/r 3 E = IR + Ir V = I.R V = W /Q

12 ( ) -12- NC1790(E)(M9)V EXMINTION NUMBER: SECTION QUESTION 1 NTIONL CERTIFICTE (VOCTIONL) PHYSICL SCIENCE PPER 1 LEVEL 2 NSWER SHEET [5] QUESTION [5]

13 ( ) -13- NC1790(E)(M9)V EXMINTION NUMBER: NTIONL CERTIFICTE (VOCTIONL) PHYSICL SCIENCE PPER 1 LEVEL 2 NSWER SHEET QUESTION [10] QUESTION B C D 4.2 B C D 4.3 B C D 4.4 B C D 4.5 B C D (5 3) [15] TOTL SECTION : 35