Technical Sciences Paper 1 (English)

May-June 2019 — Grade 12 / Matric — Technical Sciences

Past Paper 2019 Grade 12 English

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🎯 150 marks ❓ 12 questions ⏱️ 3h 📄 13 pages 📝 77 items found 📚 1 topics

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2.1and

Q2— Section header —

Q1— Section header —

1.2Newton Third Law of Motion refers to action

1.3Two boxes, and , of masses 30 kg and 60 kg respectively, rest on frictionless

1.4The graph below represents the relationship between the work done on an object and the time taken power acceleration potential energy

1.5crane is moving a pallet of bricks to the right while it applies an upward force of 15 925 over a height of 1,8 m . The mass of the pallet of bricks

1.6Which ONE of the following statements is CORRECT about a liquid with a low viscosity has a high

1.7Which ONE of the following statements is INCORRECT about semi conductors Some semiconductors contain impurities.

1.8A capacitor stores charge Q at potential difference V. What will happen t o the magnitude of the charge if the potential difference is doubled and the capacitance is kept constant?

1.10Identify the type of motor represented in the diagram below DC motor AC generator

Q2— Section header —

2.1The diagram below shows a box of 6 kg mov ing at constant velocity to the east while three forces, F , F and F

2.1.1State Newton First Law of Motion in words. (2\

2.1.2What is the magnitude of the acceleration of the box? (1\

2.1.3Calculate the magnitude of force F if Newton First Law is obeyed. (3\

2.2A force (F \of 140 N is applied to push a block of mass 25 kg across a rough horizontal surface at an angle of 30 with the horizontal, as shown in the diagram below. The

2.2.1Draw a labelled free body diagram showing ALL the forces acting on the block. (4\

2.2.2Calculate the magnitude of the kinetic frictional force experienced by the block. (4\

2.2.3What will happen to the kinetic frictional force when the angle between the applied force and the horizontal is increased? Write only INCREASE , DECREASE

2.2.4Calculate the acceleration of the block. (4\

2.2.5The same block of 25 kg now experiences a pulling force of 140 N as shown in the diagram below. If e erything else remains the same, how will the magnitude of the normal force be influenced? Write only

Q3— Section header —

3.1A baseball of mass 0,145 kg is thrown to a baseball player at a velocity of 49,17 m.

3.1.1Define the term impulse. (2\

3.1.2How will the impulse of the ball on the bat be affected when the velocity at which the ball returns towards the bowler is increased to a value

3.1.3Will the net force exerted by the ball on the bat INCREASE or DECREASE when the time of contact between the ball and the bat increases? Give a reason for your answer. (A

3.1.4Calculate the net force exerted by the bat on the ball when the contact time between the bat and the ball is 0,007 s. (4\

3.1.5What is the magnitude and direction of the net force exerted by the ball on the bat? (2\

Q3— Section header —

3.2car of mass 200 kg travelling at a velocity of

3.2.1Is momentum a vector or scalar quantity? (2

3.2.2What is the condition required for a collision to be in elastic? (2

3.2.3Calculate the velocity of the truck car combination after collision. (4\ [24] Before collision After collision24

Q4— Section header —

4.1An electrician working on an electric pole dropped his hammer of mass 0,56 kg at a height of 8 m above the ground. Assume that the system is isolated.

4.1.1Define the term kinetic energy (2\

4.1.2State the principle of conservation of mechanical energy in words. (2\

4.1.3Calculate the mechanical energy of the hammer at 8 m above the ground. (3\

4.1.4Calculate the velocity of the hammer at a height of 3,5 m above the ground (4\

4.1.5Give the magnitude of the hammer s kinetic energy just before it hits the ground ithout calculations

4.2man applies a force of 200 N to pull a crate full of bricks over a distance of 9 m. The total mass of the crate with its contents is 120 kg.

4.2.1Define the term work done (2\

4.2.2Calculate the amount of work done by friction. (3\

4.2.3What should be the size of the angle between the applied force and the direction of motion for the amount of work done on the crate and its contents to

4.2.4Calculate the net work done on the crate and its contents. (4\ [24] 9 m = 20024

Q5— Section header —

5.112 mm solid square bar is 250 mm long. A force of 3 000 N causes the bar to stretch to 252 mm long

5.1.1Define the term stress (2\

5.1.2Calculate the stress of the bar if the area is 1,44 x 10

5.1.3Determine the strain the bar experience s. (3

5.1.4 What is the relationship between the modulus of elasticity and the flexibility of a substance? (2

5.2he diagram below shows a hydr aulic system. force of 300 N,

5.2.1 Calculate the radius of iston (3\

5.2.2 Calculate the upward force (6\

5.2.3 State FOUR uses of hydraulic systems. (4 [23] Technical23

Q6— Section header —

6.1(2\

6.2What is the relation ship between the capacitance of a capacitor and the distance between the two plates (2\ 6.

Q7— Section header —

7.1Define power (2\

7.2A circuit consists of a battery of FOUR cells connected in series, each with an emf of 3 V. The battery is then connected to two external resistors of 5 and 2 connected in parallel The two resistors are connected in series with

7.2.1Calculate the t otal resistance of the circuit (3 The 5 resistor is replaced with a 6 resistor. How will this change influence the following

7.2.2Total resistance of the circuit (2\

7.2.3Potential difference over the parallel combination (2\

7.3Calculate the cost to run a washing machine of 230 V with a current of 20 A for ONE hour, if the price of electricity is R0,85 per kWh. [14]14

Q8— Section header —

8.1State the right hand rule to determine the direction the magnetic field around a straight

8.2Define magnetic flux density (2\

8.3A coil of wire is connected to a sensitive galvanometer. A bar magnet is positioned next to the coil as shown in the diagram below.

8.3.1What will be observed on the galvanometer when the magnet is moved into the coil? (1\

8.3.2Name and state the law which is applied in this observation. (3\

8.3.3What happens when the speed of the movement of the magnet is increased? (2\

8.4State Lenz s law in words (2\ [12

Q9— Section header —

9.1.1Is this step up transformer or step

9.1.2Calculate the primary voltage for this transformer. (3\ [5] TOTAL: 150 primary secondary 200 turns5

Topics Identified

Leadership

Mark Allocation

Total150 marks

Sections20 + 22 + 24 + 24 + 23 + 6 + 14 + 5 = 138 marks

Paper information

SubjectTechnical Sciences

Year2019

SessionMay-June

TypePast Paper

PaperPaper 1

LanguageEnglish

Pages13

Downloads5

Examination context

Decade2010s

Years ago7y

Season—

Start day—

Exam period—

Days since exam—

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