ROOSEVELT HIGH SCHOOL
PHYSICAL SCIENCES
GRADE 10 FET
JUNE EXAMINATION PAPER 1
DATE: June 2021
TIME: 120 minutes
MARKS: 100
EXAMINER: Ms C. Murcott
MODERATORS: Ms L. Höll
Mr I. Chicktay
INSTRUCTIONS AND INFORMATION
1.
This question paper consists of 11 pages including 1 data sheet.
2.
This question paper consists of SIX questions. Answer ALL the questions.
Read each question carefully before answering.
3.
Number the answers correctly according to the numbering system used in this
question paper.
4.
Leave ONE line between two sub-questions, for example between QUESTION 2.1
and QUESTION 2.2.
5.
You may use a non-programmable calculator.
6.
You may use appropriate mathematical instruments.
7.
You are advised to use the attached DATA SHEETS.
8.
Show ALL formulae and substitutions in ALL calculations.
9.
Round off your final numerical answers to TWO decimal places.
10.
Give brief motivations, discussions, et cetera where required.
11.
Write neatly and legibly.
QUESTION 1: MULTIPLE-CHOICE QUESTIONS
Four options are provided as possible answers to the following questions. Each question has
only ONE correct answer. Write down only the letter (A – D) next to the question number.
For example 1.11 E
1.1
A volt is the same as…
1.2
1.3
A
a coulomb per ohm.
B
a joule per coulomb.
C
an ohm per second.
D
a coulomb per second.
(2)
An object accelerates uniformly when the … of the object changes with the same
amount in equal time intervals.
A
speed
B
displacement
C
mechanical energy
D
velocity
(2)
Four circuit diagrams are shown below. Each circuit uses an identical cell and
identical light bulbs.
The switch in each of the four circuits is closed. In which circuit are the light
bulbs the dimmest?
A
Circuit A
B
Circuit B
C
Circuit C
D
Circuit D
(2)
2
1.4
1.5
Which of the following scenarios will cause the greatest increase in resistance?
A
Temperature
Increases
Length
Increases
Thickness
Increases
B
Decreases
Increases
Increases
C
Increases
Decreases
Increases
D
Increases
Increases
Decreases
(2)
Consider the following diagram of a circuit. The lightbulbs are not identical.
The reading on A2 will be equal to…
A
the reading on A3.
B
the reading on A1.
C
the reading on A3 minus the reading on A1.
D
the reading on A1 minus the reading on A3.
(2)
3
1.6
1.7
1.8
Which one of the following combinations includes TWO scalar quantities and ONE
vector quantity?
A
Speed, velocity, distance
B
Mass, force, acceleration
C
Velocity, displacement, acceleration
D
Speed, displacement, acceleration
(2)
Two cars are travelling in opposite directions along a straight road. It is observed
that they covered the same distance over a time interval of 5 s. Which ONE of the
following physical quantities is the SAME regarding the cars over the interval of 5 s?
A
Displacement
B
Average velocity
C
Average speed
D
Acceleration
(2)
Three forces act simultaneously on an object, as shown below.
The resultant (net) force acting on the object is…
A
21 N west
B
21 N east
C
7 N west
D
7 N east
(2)
4
1.9
1.10
In the equation vf = vi + aΔt, the SI unit for aΔt is…
A
m
B
s-1
C
m.s-1
D
m.s-2
(2)
The area under a velocity-time graph represents…
A
the velocity.
B
the acceleration.
C
the displacement.
D
the distance travelled.
(2)
[20]
QUESTION 2
2.1
Study the section of the tribo-electric series below and answer the questions that
follow.
Sarah strokes her pet cat with her hand.
State which object:
2.1.1
Becomes positive.
(1)
2.1.2
Becomes negative.
(1)
2.1.3
Loses electrons.
(1)
2.1.4
Gains electrons.
(1)
5
2.2
Two identical insulated spheres, X and Y, suspended by threads from a ceiling
are held a small distance apart, as shown in the diagram below.
Sphere X carries a charge of +8 x 10-18 C, while sphere Y has an excess 60 electrons.
2.2.1
Calculate the magnitude of the charge on sphere Y
(3)
The spheres are now released and move towards each other.
2.2.2
State the law of charges which explains why the spheres move
towards each other.
(2)
The spheres are allowed to touch. After touching they move away from each other.
2.2.3
Calculate the charge on each sphere after they have separated.
(4)
2.2.4
Calculate the difference in charge on sphere X after the spheres
touched and separated.
(2)
2.2.5
Calculate the number of electrons that were transferred from sphere Y
to sphere X.
(3)
[18]
6
QUESTION 3
3.1
Consider the circuit below and answer the questions that follow.
3.1.1
3.1.2
3.2
Calculate the amount of charge that flows past a point in the circuit in
3 minutes.
(3)
Calculate how much energy is transferred during this time period.
(3)
Study the circuit below and answer the questions that follow.
Calculate the:
3.2.1
Effective resistance of the circuit.
(3)
3.2.2
Reading on voltmeter V1.
(3)
3.2.3
Reading on voltmeter V3.
(3)
3.2.4
Reading on ammeter A2.
(4)
3.2.5
a) If the 6 Ω resistor is removed from the circuit, would the reading on
ammeter A1 INCREASE, DECREASE or REMAIN THE SAME?
(1)
b) Give a reason for your answer above.
(1)
[21]
7
QUESTION 4
A motorbike produces a driving force of 350 N and the driver moves eastward on a straight, flat
road.
When the driver applies the brakes a frictional force of 90 N acts on the wheels and slows
down the motorbike and the rider.
4.1
Define the term vector.
(2)
4.2
Calculate the resultant force acting on the motorbike and the rider. (Treat the
motorbike and the rider as a single object).
(3)
The rider travels 150 km eastwards with the wind in a time of 90 minutes. The rider gets to a
petrol station and turns around. He then travels back to the starting point in a time of
1.87 hours, this time against the wind.
4.3
Differentiate between distance and displacement by referring to the above
scenario.
(4)
4.4
Explain why the journey from the starting point to the petrol station takes less
time than the journey from the petrol station back to the starting point.
(2)
4.5
Calculate the average speed of the motorbike for the entire journey in km.h-1.
(3)
The wind blows at a constant speed of 10 km.h-1 EASTWARDS.
4.6
Calculate the magnitude of the actual velocity of the motorbike in km.h -1 (in other
words, if there is no wind).
(4)
[18]
8
QUESTION 5
A car is stationary at a red traffic light. When the light changes to green the car
accelerates at 2.5 m.s-2 along a straight road for 8 seconds. The car then moves at a
constant velocity for 25 s.
5.1
Calculate the speed of the car after the first 8 seconds.
(4)
5.2
Calculate the distance travelled at constant velocity.
(3)
The speed limit is 60 km.h-1.
5.3
Is the driver adhering to the speed limit? Show calculations to prove your
answer.
(3)
A dog runs out into the road 50 m in front of the car. The driver immediately
slams on brakes.
5.4
5.5
The car takes 4s to come to a complete stop. Will the car hit the dog or stop
before it gets to the dog?
(3)
Will the stopping distance of the car INCREASE or DECREASE when the road
is wet and slippery?
(1)
[14]
9
QUESTION 6
Study the displacement-time graph below and answer the questions that follow.
The displacement time graph above shows the displacement of a teacher walking through a
section of her class, sanitizing desks. Let east be positive.
6.1
Calculate the total distance covered by the teacher.
(2)
6.2
Calculate the average velocity of the teacher in the first 2 seconds.
(4)
6.3
During which time periods is the teacher stopping to sanitize desks?
(2)
6.4
What is the total displacement of the teacher?
(1)
[9]
Total: [100]
10
DATA FOR PHYSICAL SCIENCES GRADE 10 PAPER 1
PHYSICAL CONSTANTS
FORMULAE
MOTION
ELECTROSTATICS
ELECTRIC CIRCUITS
11