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BOTSWANA EXAM INATIONS COUNCIL

tl.L in collaboration with

? UNIVERSITY OF CAN/BRIDGE LOCAL EXAMINATIONS SYNDICATE

Botswana General Certificate of Secondary Education

CANDIDATE
NAME

CENTRE CANDIDATE
NUMBER NUMBER
>-

PHYS!CS 0571/03
"\:
--- Paper 3 October/November 2010
::- t hour 15 minutes
--
": Candidates answer on the Question Paper
::
No Additional Materials are required
L- -
': READTHESE INSTRUCTTONS FIRST

Write your centre number, candidate number and name in the spaces provided at the top of this page.
Answer all questions.
Write your answers in the spaces provided on the question paper.
You may lose marks if you do not show your working or if you do not use appropriate units.
Do not use staples, paper clips, highlighters, glue or correction fluid.
The number of marks is given in brackets [ ] at the end of each question or part question.
Take the weight of 1 kg to be 10 N (i.e. acceleration of free fall = 10 m/s2).

For Examiner's Use

This document consists of 12 printed pages.

DC (NF/CGW) 2601912
oBEC 20't0 [Turn over
 For
2
Examiner's
Use
1 Fig. 1 .1 shows a car of length 5.8 m. The car accelerates from point A to point B.

d
-v'vlll-

r..--.-.1 :
tf
iii
tl

Fig.1.1

The car takes 0.80s to pass point A and 0.50s to pass point B

(a) Calculate the speed of the car when passing

(i) point A,

(ii) point B.

speed = ........ t1l

(b) The car takes 6.0s to move from A to B

Calculate the acceleration of the car.

acceleration = l2l

(c) Find the distance dbetween A and B

d- ........ ...t21
@ BEC 2010 0571/03/o/N/10
 3 For
Examinefs

2 A bag of mass 5.0k9 is dropped from a helicopter hovering above the ground
Use

The bag hits the ground after 8.0s (g = tOm/s2).

(a) Assuming that there is no air resistance, calculate the height of the helicopter above the
ground.

height = .............. ..................tz]

(b) The bag reaches terminal velocity before hitting the ground.

Describe how each of the following quantities changes as the bag falls to the ground.

(i) velocity

[1]

(ii) acceleration

t2l

o BEC 201 0 0571/03/O/N/1 0 [Turn over

 For
4
Examinels
Use
3 Fig.3.1 shows a spring balance used to keep a uniform beam in equilibrium.
The beam is pivoted at the centre and a load of 4.2 N is hung 6.0 m from the pivot.

g balance

2m

Fig.3.1

(a) State the principle of moments.

t1l

(b) Determine the reading on the spring balance.

reading = l2l
(c) What is the direction of the force acting on the pivot?

t1l

(d) Calculate the size of the force acting on the pivot. Assume that the weight of the beam is
negligible.

force = l2l

@ BEC 2010 0571/03/o/N/10

 5 For
Examine/s

4 Fig.4.1 shows an instrument used to measure the density of liquids.

Use

The instrument is shown floating in water at a temperature of 20 "C.

density scale

water

Fig.4.1

(a) What is the name of the instrument?

t1l

(b) (i) Name the force that prevents the instrument from sinking.

...t11

(ii) How does the force in (b)(i) compare with the weight of the instrument?

t1l

(c) The instrument is placed in water at a higher temperature.

State and explain what is observed.

observation t1l

explanation ...
L
t1l

@ BEC 2010 0571/03/O/N/10 [Turn over

 For
6
Examinels
Use
5 Fig. 5.1 shows a television aerial supported by two wires. The wires apply forces of 80 N and
120 N. The diagram is not drawn to scale.

80N
120 N

Fig.5.1 (not to scale)

(a) What is the angle between the two wires?

L'
.t1l

(b) Choosing a suitable scale, draw a vector diagram to determine the resultant force when
the 80N and the 120N forees are added.
State the scale that you use.

scale

size of the resultant force = .............. .tsl

@ BEC 2010 0571/03/O/N/10

 7 For
Examine/s

6 Lemonade is cooled by adding lumps of ice to it. 1409 of ice at a temperature of 0"C cools
Use

0.90k9 of lemonade from 26"C to 12"C.

The latent heat of fusion of ice is 330000J/kg.

The specific heat capacity of water is 4200J/(kg"C).

(a) Calculate the amount of energy

(i) gained by the ice in melting,

energy - l1l
(ii) gained by the melted ice,

(iii) lost by the lemonade.

energ} = ................ .t1l

L (b) Find the specific heat capacity of lemonade.

specific heat capacity - ......... .....12)

(c) The actual amount of heat lost by the lemonade is smaller than that calculated in (aXiii).
Explain why.

...t1 l

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 I For
Examinels
Use
7 Fig.7.1 shows part of the electromagnetic spectrum

A B c Visible D Radio
light WAVES

Fig.7.1

(a) Name the waves represented by the letters C and D

c .............

D l2l
(b) Which letter represents a wave that comes from the nuclei of radioactive sources?

..t11

(c) Fig.7.2 shows a quarry mine near a hill and an office.

\,

office
hiil d I
u
n

blast area

Fig.7.2

During blasting, the office staff hear a sound 1.5s after they see the blast.
A further 1.0s later the staff hear a similar but quieter sound.The speed of sound in air is
330m/s.

(i) What name is given to the second sound?

\,
.t1l

(ii) Calculate l, the distance between the office and the blast area.

l= l2l
(iii) Determine d, the distance between the blast area and the hill.

j= .. t3l

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 I For
Examinels

I Fig.8.1 shows an electric heater.

Use

coiled thin tungsten wire

shiny surface

Fig.8.1

(a) Name the type of radiation produced by the tungsten wire when the current is flowing

.................. t1 l

(b) Give a reason why the tungsten

I wire is

(i) coiled,

(ii) made thin.

.....12J

(c) Explain why the sudace of the heater is

(i) shiny,

! (ii) curved

l2l

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 10 For
Examinefs
Use
9 Fig.9.1 shows two coils wound around a cardboard tube

coil 1 coil2
cardboard tube
P
)))))

os /1\
L.l' --
l
galvanometer

Fig.9.1

The switch, S, is closed and coil 1 is slid towards coil 2.

(a) State and explain what is observed.

observation
I

explanation

t3l

(b) The experiment in Fig.9.1 is repeated with the cardboard replaced by a soft iron rod

(i) State and explain what is observed

observation

explanation

l2l
(ii) What will be the pole of the rod at end P?

.t1l

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 11 For
Examinels

10 A permanent magnet is pushed into a coil, as shown in Fig. 10.1

Use

<-
nometer

Fig.10.1

(a) (i) State and explain what is observed when the magnet is pushed into the coil.

...t2]

(ii)
L On Fig. 10.1 , draw an arrow to show the direction of the induced current. t1l

(b) Fig. 10.2 shows the structure of a bicycle dynamo.

soft-iron core
NS

coil

Fig.10.2

(i) What type of current is produced by the dynamo?

! t1l

(ii) What is the purpose of the soft-iron core?

I1l
(iii) State three ways of increasing the output voltage

3. t3l

(iv) Explain why no current is induced when the bicycle stops.

12)
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 For
12
Examine/s
Use
1 1 (a) Strontium 90 decays by emitting a beta-particle.
-

State how the atomic number and mass number are affected by the emission of a
beta-particle.

(i) atomic number

12)

(b) A radioactive source has a half-life of 2 months. After months, the count rate has I
reduced to 25 counts per minute. Complete Table 11,1 to find the initial count rate of the
source.

Table 11.1

count rate/min 25

time/months 0 2 4 6 B

12)

initial count rate = t1l

\-

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reasonable eflort has been made by the publisher (BEC) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the
publisher will be pleased to make amends at the earliest possible opportunity.

o BEC 2010 0571/03/O/N/10