# Physical Sciences Grade 12 P1 Gauteng Mock 2018 QP

> Grade 12 Physical Sciences Paper 1 question paper from the Gauteng Mock Exam 2018, 20 pages. Read online or download the free PDF.

- Page: https://www.hlayiso.com/library/gp-2018-paper-1/49c28923-b488-418a-89f4-ef408758f4fc
- Updated: 2026-09-27
- Subject: Physical Sciences
- Grade: Grade 12
- Document type: Question paper
- Year: 2018
- Exam period: Gauteng Mock Exam
- Paper: 1
- Curriculum: CAPS
- Pages: 20

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## About this document

Physical Sciences · Grade 12 · Gauteng Mock Exam · 2018. Question paper, 20 pages. Read online or download the PDF.

Read it free online on the page above; download the PDF from there.

## Document text

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### Page 1

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ES

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” 2 REPUBLIC OF SOUTH APRICA

GAUTENG DEPARTMENT OF EDUCATION
PREPARATORY EXAMINATION

2018

10841
PHYSICAL SCIENCES: PHYSICS

PAPER 1

TIME: 3 hours
MARKS: 150

15 pages + 4 data sheets

PHYSICAL SCIENCES: Paper 1
1084E

UAC

X10

nnn

P.T.O.

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PHYSICAL SCIENCES: PHYSICS 2
(Paper 1) 10841/18

GAUTENG DEPARTMENT OF EDUCATION
PREPARATORY EXANINATION — 2018

PHYSICAL SCIENCES
(Paper 1)

TIME: 3 hours

MARKS: 150

INSTRUCTIONS AND INFORMATION

1.

The question paper consists of 9 questions. Answer ALL the questions in the
ANSWER BOOK.

Start each question on a NEW page in the ANSWER BOOK.

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

Leave ONE line open between two sub-questions, for example between
Question 2.1 and Question 2.2.

You may use a non-programmable calculator.

You may use appropriate mathematical instruments.

You are advised to use the attached DATA SHEETS.
Show ALL formulae and substitutions in ALL calculations.

Round-off your final numerical answers to a minimum of TWO decimal
places.

Give brief motivations, discussions, et cetera where required.

Write neatly and legibly.

P.T.O.

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PHYSICAL SCIENCES: PHYSICS 3
(Paper 1) 10841/18

QUESTION 1: MULTIPLE-CHOICE QUESTIONS

Various options are provided as possible answers to the following questions. Choose the answer

and write only the letter (A — D) of your choice next to the question number (1.1 — 1.10) in the
ANSWER BOOK, e.g. 1.11 D.

1.1 Which one of the following physical quantities is equal to the product of net force and
change in time?

A Power
B Impulse
C Energy
DBD Work

12 A full brick of mass m and a half brick of mass % m fall freely from the 10" floor of a
building. Ignore the effects of air resistance.

When the bricks are 4 m above the ground, they have the same ...

A _ kinetic energy.

B potential energy.
C acceleration.

D momentum.

1.3 Apackage is dropped from a hot air balloon from two different heights. In the first
instance the height of the balloon from the ground is H and it takes t seconds for the
package to reach the ground. in the second instance the package is dropped from a
height of 4H.

Ground

The time for the package, dropped from the height of 4H, to reach the ground
compared to the time t of the package dropped from H is:

A t

B 2t
CG At
D 16t

P.T.O.

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1.4

1.5

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PHYSICAL SCIENCES: PHYSICS 4
(Paper 1) 10841/18

A bail is rolled up a smooth, inclined plane. The ball stops briefly at some point on its
way up and rolls back to the point where it was first released.

Which one of the following velocity-time graphs best shows the motion of the ball?

A B Cc D
a
<< = on a
= £ — ' £
2 2 2 ' 2
30 oO 30 1 So
3 wey 8 i) 3 78) 8 ro)
S > > 1 >
F
|
(2)
v

A passenger in a car that is moving at constant velocity at night observes that there is
a car behind them through its lights and sound. If the passenger hears a higher
frequency than that emitted by the engine of the car behind them then the car behind
them is ...

moving at the same speed as theirs.

moving faster than theirs.

moving slower than theirs.

stationary with its lights on and engine at a constant high rev. (2)

UOUDY

P.T.O.

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PHYSICAL SCIENCES: PHYSICS 5
(Paper 1) 10841/18

1.6 Two small, oppositely charged spheres on an insulated surface are held a distance r
apart as shown in the diagram.

When the spheres are released simultaneously, they rol! towards each other due to
the electrostatic force of attraction.

Which ONE of the following graphs represents the magnitude of the force experienced
by each sphere as a function of the distance r between their centres?

A B c D
F F F F
- - —— -—
r r r r (2)
1.7 The free-body diagram below shows all the forces acting on an object that is moving
up an inclined plane. All the forces are drawn to scale.
N
Fa
f
Fgsin 6 Fgcos 8

The kinetic energy of the object ....
A increases.
B decreases.
Cc is zero.
D remains the same. (2)

P.T.O,

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PHYSICAL SCIENCES: PHYSICS 6
(Paper 1) 10841/18

18 A battery with an emf € and an internal resistance r is connected to a resistor R as
shown in the diagram below.

A second resistor with the same resistance as R is connected in parallel with R. How
will the voltmeter and ammeter readings change when the second resistor is added to

the circuit?
Voltmeter reading Ammeter reading
A Increases Increases
B Decreases Increases
c Increases Stays the same
D Stays the same Decreases

(2)

P.T.O.

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PHYSICAL SCIENCES: PHYSICS
(Paper 1)

10841/18

1.9 An experiment was carried out to study the effect of a magnetic field on a current
carrying conductor Y, placed within a magnetic field. X and Z are poles of magnets.

x ? z
When a current flows through Y, the conductor moves downwards as shown by the

arrow. Which one of the following combinations, regarding the polarities of the
magnets and the direction of the current is correct?

Polarity X Polarity Z Current direction in Y
A South North Out of the page
B North North Into the page
Cc LNorth South Out of the page
D | North South Into the page

1.10 Electron transitions occur in an atom as shown in the diagram. In each transition
photons are emitted.

Ml V

n=4
n=3
n=2
I
n=1

(2)

if the emitted photons are all capable of releasing photoelectrons from a certain metal,
which photon will release electrons with the lowest kinetic energy?

A

B
c
D

I

Ul
it}
Vv

(2)
[20]

P.T.O.

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PHYSICAL SCIENCES: PHYSICS 8
(Paper 1) 10841/18

QUESTION 2 (Start on a new page.)

A. 50 kg stunt dummy is attached to one end of a 5 m inelastic light rope. The other end is
attached to a fixed point P that is 5 m vertically above a stationary wagon. The dummy is
then pulled upward to point A such that the rope is fully stretched and held horizontally as
shown in the diagram below. When released, the dummy swings downwards along the
dotted path. On reaching the stationary wagon, the stunt dummy detaches from the rope,
falls flat on the wagon and sticks to it. The wagon has a mass of 60 kg.

The wagon and the stunt dummy move as one unit towards the right.

Stunt dummy

5m

' *
I .
oe » Direction of motion
B
Fr=60N 60 kg wagon
2.1 State the faw of conservation of mechanical energy. (2)

2.2 Calculate the magnitude of the velocity of the stunt dummy when it reaches its
lowest point B. (4)

As the dummy and the wagon move as one unit towards the right, a constant
frictional force of 60 N acts on the wheels of the wagon as shown.

2.3. State the principle of conservation of linear momentum. (2)

2.4 Calculate the ...

24.1 initial velocity of the dummy and wagon soon after the dummy lands on the

wagon. (3)
2.4.2 impulse provided to the dummy. (2)
2.4.3. distance moved by the dummy-and-wagon combination before coming to
rest. (4)
[17]

P.T.O.

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PHYSICAL SCIENCES: PHYSICS 9
(Paper 1) 10841/18

QUESTION 3 (Start on a new page.)

1.

3.1
3.2
23

3.4

3.5

3.6

A tennis ball is thrown with a velocity of 10 m-s* vertically downwards from the top of a
20 m high building. The ball bounces off the ground, reaching a height which is 1m
below the point from which it was projected. Ignore air resistance and any lateral
movement of the ball.

g

“Boro

x

@
=
3

20m

Explain free fall.
Calculate the magnitude of the velocity with which the ball strikes the ground.
Calculate the time that it takes the ball to reach the ground after it was thrown.

Calculate the magnitude of the velocity with which the ball leaves the ground after
the bounce.

Is the collision of the ball with the ground elastic or inelastic?
Give a reason for your answer.

Sketch the velocity-time graph of the ball’s flight from the moment it was thrown to
the maximum height after the bounce. Your sketch must show values at the
following points:

Velocity when ball was thrown

Velocity just before it bounced off the ground
Velocity just after the bounce

Time after launch at which it bounced on the ground

(2)
(3)
(3)

(3)

(2)

(6)
[19]

P.T.O.

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PHYSICAL SCIENCES: PHYSICS 10
(Paper 1) 10841/18

QUESTION 4 (Start on a new page.)

A 40 kg box slides from rest down a rough slope of length 8 m. It starts the downward slide
from a height h above the horizontal. The slope makes an angle of 30° with the horizontal.
While sliding, the box experiences a constant acceleration of 2 ms”

4.1 State the Work-Energy theorem in words. (2)

4.2 Draw a free-body diagram that shows ALL the forces acting on the box as it slides
down the slope. (3)

4.3 Calculate the following:

4.3.1 The kinetic energy of the box as it reaches the bottom of the slope (5)
4.3.2 The work done on the box by the gravitational force (4)
4.3.3 The work done on the box by the frictional force using the work-energy

theorem (4)
4.3.4 The magnitude of the frictional force acting on the box Or

P.T.O.

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PHYSICAL SCIENCES: PHYSICS "1
(Paper 1) 10841/18

QUESTION 5 (Start on a new page.)

Two racing cars approach the finishing line as shown on the diagram below. Car A
approaches the finishing line at a speed of 284,4 km-h™’. The engine of car A produces a
sound with a frequency of 1200 Hz. Assume the speed of sound in air is 340 m-s

5.4
5.2
5.3

5.4

CarA Car B
Va = 284,4 kmh! Fg = 1170 Hz
Fa = 1200 Hz

State the Doppler effect.

For car A, what frequency of the engine sound will a man at the finishing line hear?

A second racing car, B, produces a sound with a frequency of 1170 Hz which is
heard by a man at the finishing line as 1 600 Hz.

What is the speed of car B?

An ambulance races towards an accident scene with its siren blaring and its red
lights flashing.

Explain why there is a noticeable change in the siren’s frequency as the ambulance
approaches an observer but there is no noticeable change in the colour of the red
light.

(2)
(6)

(4)

(4)
[15]

P.T.O.

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PHYSICAL SCIENCES: PHYSICS
(Paper 1) 40841/18

12

QUESTION 6 (Start on a new page.)

Learners are provided with apparatus as shown in the diagram below to investigate the
relationship between current (I) flowing through a resistor and the potential difference (V )
across the resistor.

6.1
6.2

6.3

6.4

6.5

Write down the investigative question.

Draw a circuit diagram to show how the learners must connect all the apparatus for a

success
Identify:
6.3.1
6.3.2
6.3.3

ful investigation.

The independent variable
The dependent variable

The variable that must be controlled

Explain how you would go about controlling the variable mentioned in
Question 6.3.3.

The learners recorded the following readings

of results of the investigation: At start,

the volte (Vv) reads 0,00 when ammeter (A) reads 0,00; when A is 0,29, Vis 1;
when is 0,6, Vis 2; Wis 0,9 when V is 3; whe! is 1,22, Vis 4; Ris 1,48 when V
6.5.1 Rewrite these results in a suitable table.

6.5.2 Draw a fully-labelled graph of the results.

6.5.3 Draw a suitable conclusion for this investigation.

6.5.4 What physical quantity does the gradient of the graph represent?

(2)

(3)

(1)
(1)
1)

(1)

(3)
(4)
(2)

(1)
[19

P.T.O.

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PHYSICAL SCIENCES: PHYSICS
(Paper 1)

10841/18

13

QUESTION 7 (Start on a new page.)

In the circuit diagram below the potential difference across the terminals of a battery is 12 V
when the current flowing is 1,2 A. The battery has an internal resistance of 1,5.Q. The
resistance of the ammeter and connecting wires can be ignored.

7A
7.2
7.3
1.4

15

— In
te) [tsa }-—+
fee eee Se H

x ve LR

Calculate the resistance of the external resistors in the circuit.
Calculate the resistance of resistor R.

Determine the emf of the battery.

A resistor of resistance 2 9 is connected between the points X and Y.

How will this affect the ammeter reading? Answer by writing only INCREASE,

DECREASE or REMAIN THE SAME.

Explain your answer to Question 7.4.

(3)
(4)
(3)

(1)

(2)
[13]

P.T.O.

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PHYSICAL SCIENCES: PHYSICS
(Paper 1) 10841/18

14

QUESTION 8 (Start on a new page.)

The diagram below shows a type of generator. The coil rotates clockwise.

8.1
8.2
8.3

84

8.5

8.6

Name this type of generator (AC or DC).

Give a reason for your answer to Question 8.1.

For the position of the coil as shown, in which direction will the current flow?

(Simply state a to b or b to a.)

Define the term rms current.

If the voltmeter shows a maximum voltage output of 8 V across the 5 Q resistor,

calculate the rms current output of the generator.
Starting with the coil in the horizontal position as shown:

8.6.1. Draw a sketch graph of the output voltage for one cycle of the coil.

8.6.2 Would the generator output current graph differ from the output voltage graph?

(Simply state YES or NO.)

8.6.3. Explain your answer to Question 8.6.2.

(1)
(1)

(1)
(2)

(4)

(3)

(1)

(2)
(1z

P.T.O.

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PHYSICAL SCIENCES: PHYSICS
(Paper 1)

10841/18

15

QUESTION 9 (Start on a new page.)

The circuit shown below was used to investigate the photoelectric effect. Orange light with a
wavelength of 600 nm incident on the metal surface ejected electrons from the metal
surface. The ejected electrons had zero kinetic energy.

9.1

9.3
9.4

9.5

Incident
radiation collector

pe

Metal
surface

nd

Variable power
source

Briefly describe what the photoelectric effect is.
Define work function (W,) of a metal.

Calculate the work function of the metal.

The orange light is then replaced by a faint blue light. Will the milliammeter detect a

photocurrent? (Answer YES or NO.)

Explain your answer to Question 9.4.

END

(2)
(2)
(4)

(1)

(2)
[11]

TOTAL: 150

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PHYSICAL SCIENCES: PHYSICS 16
(Paper 1) 1084118
DATA FOR PHYSICAL SCIENCES GRADE 12
PAPER 1 (PHYSICS)
TABLE 1: PHYSICAL CONSTANTS
NAME SYMBOL VALUE

Acceleration due to gravity g 9,8 m-s*
Universal gravitational constant G 6,67 x 10°" N-m?-kg*
Speed of light in a vacuum c 3,0 x 10° m-s"
Planck's constant h 6,63 x 10° J-s
Coulomb's constant k 9,0 x 10°N-m?-C?
Charge on electron e 1,6x10°%C
Electron mass Me 9,11 x 10°" kg
Mass of the earth M 5,98 x 10° kg

Radius of the earth

Re

6,38 x 10° m

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TABLE 2: FORMULAE

PHYSICAL SCIENCES: PHYSICS
(Paper 1)

10841/18

17

MOTION
[ Vg =Vj tat Ax =v,At+JaAt? or Ay =v,At+ Laat?
| Vy =V, + 2aAx or v,7 =v,2 + 2aAy Ax -(* oat or ay (“2% Jat
FORCE
r |
[Fo paw |
| Pe = p.N f, = HN |
‘ |
| =A
Fer At p w=mg
Ap = mv, —my, |
I mm mm M
i\F=G oe or F=G = 9=Ga or g-Go
WORK, ENERGY AND POWER
W=FAxcos 0 | U=mgh or E,=mgh |
4 4 | Wee =AK or = W., =AE,
K=5 mv? or E, => mv |
| AK=K,~K, or AE, =Ey -E,
Wc =AK+AU or W,, = AE, + AE, | Pp |
i i
+ |
i |

"= Fae Poem = FV gem

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WAVES, SOUND AND LIGHT

PHYSICAL SCIENCES: PHYSICS
(Paper 1)

10841/18

18

v=fan Ta
f
—Y=M = NE _ =ne
La, f, avy, f, E=hf or E=h-
E=W,+Eymxy OF E=W,+K,., where
E=hf and Wy =hf, and Eximay = FIV 9 Or Kinox = FV
ELECTROSTATICS
--KQ.Q, = _KQ
? r
view eb
q q
n=2 oo ne
6 qe

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[—

rms ~~ V2
V,
— max fi Vv
V2

Pave = Verslems
Pave = bina t
P=vm

Pyem = Tag

PHYSICAL SCIENCES: PHYSICS 49
(Paper 1) 10841/18
ELECTRIC CIRCUITS
av | emf (e)=(R+r) -
: : emk (£)=|(R +1)
R, =R, +R, Tee
zee q=lAt
R, R, Ry 7
W=V
q po
W=Vvlat
W= PRat PRM
2 P=PR
we Vat vi
R [|P=R

### Page 20

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