Technical Sciences Paper 1 (English)

May-June 2021 — Grade 12 / Matric — Technical Sciences

Past Paper 2021 Grade 12 English

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🎯 150 marks ❓ 12 questions ⏱️ 3h 📄 3 pages 📝 67 items found 📚 2 topics

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2.1and

Q2— Section header —

Q1— Section header —

1.1Two crates of masses 120 kg and 65 kg are resting on a smooth horizontal surface hen a force of 600 N is applied on the 120 kg crate

1.2A man of 85 kg and a boy of 35 kg on roller skates are standing facing each other on a frictionless horizontal surface. They put their hands together and push against each other so that they move apart.

1.3Which ONE of the following statements BEST explains why the momentum of an object is a vector quantity?

1.4When a change in the momentum of an object remains constant while the contact time increase

1.5A boy is pulling an object to the left along a straight horizontal surface without lifting it . All the forces acting on the object are shown in the force diagram below. Which ONE

1.6Strain is the division of the load by the smallest cross sectional area of the test specimen. the ratio between the change in length and the original length.

1.7The diagram below shows a water tank with water jets at different heights t which point will the pre ssure be the

1.8The SI unit for capacitance is arad oulomb

1.9The magnitude of the magnetic flux is determined by the number of magnetic field lines projected to the surface at different angles. perpendicular magnetic field lines that pass through the surface. magnetic field lines that are parallel to the surface.

1.10A coil of wire around a carton roll is connected to a galvanometer. A bar magnet is p aced next to the coil, as shown in the diagram below. What will one observe

Q2— Section header —

2.2Define the term tension (2\

2.3If the trailer is replaced b y another trailer with a mass of 750 kg , how will this impact on the tension in the rope? Write down only INCREASE , DECREASE

2.4The driver put her book on the passenger seat while driving. She then sees a donkey in the middle of the road and suddenly applies the

2.4.1What will happen to the book as the brakes are applied? Write only MOVE FORWARD, MOVE BACKWARD or REMAIN

2.4.2Use a science law/principle to e xplain your answer to

Q2— Section header —

Q3— Section header —

3.1Define the term normal force (2\

3.2Draw a labelled free body diagram of ALL the

3.3State Newton Second Law of Motion in words. (2\ 3.

4.1Define the term momentum (2\

4.2State the principle of conservation of linear momentum in words. (2\

4.3What is the magnitude of the net external force acting on the system above (2\

4.4Calcul ate the mass of the construction vehicle if the cement bags have a mass of 100 kg.

4.5Use calculations to determine whether the collision is elastic or inelastic. [1 QUESTION

5.1Define the term impulse (2\

5.2Calculate the net force exerted by the tr uck on the car. (4\ [6] Technical Sciences6

Q6— Section header —

6.1Define the term work (2\ 6. Calculate the work done by g

6.5State the principle of the conservation of mechanical energy in words. (2\

6.6The robotic arm releases the cel phone from the height of 50 cm. Use the principle of the conservation of mechanical energy to calculate the velocity at which the cellphone will hit the floor. (4\

Q7— Section header —

7.13 m long steel bar has a diameter of 80 mm. It is stretched with a force of 30 kN and extends by 0,4 mm as shown in the diagram below Calculate the:

7.1Stress of the steel bar (4\

7.1St n experienced by the bar (3\ 3 m 0,4 mm

8.1What makes silicon different from a metal in terms of conducting electricity? Name ONE diffe rence Refer to the electron arrangement (2

8.2Name and define the process through which s ilicon could become a better conductor of electricity. (3\

8.3De fine junction diode

7.2Study the pictures below Classify each picture as either a PERFECTLY ELASTIC BODY or a PERFECTLY PLASTIC BODY

7.3How does temperature affect the viscosity of oil? (2\

7.4State Pascal law in words. (2\

7.5Give TWO examples of practical applications of Pascal law in hydraulics.

7.6A force of 2 000 N is exerted on the small er piston with a cross sectional area of 2,827 x 10

7.2.1Play dough

7.2.2Wax

7.2.3Elastic band

7.2.4Clay Technical Sciences 12 DBE/20 21

8.4The plates of a capacitor are 0 mm apart and store a charge of

8.4.1Calculate the potential difference between the plates. (3\

8.4.2Calculate the area of the plate. (4

8.5A 5 are connected in parallel to a 9 cell in a circuit

8.5.1 Draw a neat labelled circuit diagram representing th circuit above (3\

8.5.2 Calculate the power dissipated by EACH resistor. (5 [2

9.1Define magnetic flux density

9.2Calculate the magnetic flux density that passes through this rectangular coil with length 150 mm and width 90 mm.

10.1Define transformer (2\

10.2Determine the value of the secondary voltage. (3\

10.3Study the diagram below and answer the questions that follow Identify the type of generator represented by:

10.3.1FIGURE (1

10.3.2FIGURE (1\ Label component:

10.3.3(1\

10.3.4(1\

10.3.5State the function of component (2\ [11] TOTAL: 150 primary voltage = 120 V secondary voltage =11

Topics Identified

LeadershipBusiness Plan

Mark Allocation

Total150 marks

Sections20 + 10 + 6 + 17 + 11 = 64 marks

Paper information

SubjectTechnical Sciences

Year2021

SessionMay-June

TypePast Paper

PaperPaper 1

LanguageEnglish

Pages15

Downloads6

Examination context

Decade2020s

Years ago5y

Season—

Start day—

Exam period—

Days since exam—

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