Oentre Number Candidate Number Name

-\
4
MINISTRY OF EDUCATION, BOTSWANA
in collaboration with
UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE
Botswana General Certificate of Secondary Education

PHYSICS 0571/03
Paper 3 October/November 2005

Candidates answer on the Question Paper t hour 15 minutes

No Additional Materials are required

Read the following carefully before you start.

L Write your centre number, candidate number and name in the spaces provided at the top of this
L page.
Answer all questions. I
write your answers in the spaces provided on the question paper.
You may lose marks if you do not show your working or it 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)
=

t,
L

For Examiner's Use

This question paperconsists of 14 printeo pages and 2 blank pages.

SP tNF'JG) S77B3C 2
o BEC 200s
[Turn over
 2 Foy
fu.aminer's
Use
1 A cheetah accelerates uniformly from rest and reaches a speed of 30 m/s in 6.5 s. An aircraft
accelerates uniformly from rest and reaches a take off speed of 60 m/s in 30 s.

(a) On Fig. 1.1, draw a speed-time graph for,

(i) the cheetah (label this graph X),

(ii) the aircraft (label this graph Y).
i3l

70 I

60

'i:l
,l

50
speed
MS Ti-1*

40
--a-
TIT
Trir
t-

30 +
tr
+ .-
20

i
#
i

10 \-

---i-+

0
0510152025 30 35
time/s

Fig. 1.1

(b) (i) Which of the two graphs shows a greater acceleration?

(ii) Justify your anslver tc (bxi)

12)
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3 For
Examiner's
2 Fig . 2.1 shows a girl holding a ball at point h, which is 1 .5 m high. Use

ball

girl

1.5 m

Fig.2.1

She then throws the ball vertically up to a height of 3.3 m above the ground. Neglect air
resistance.

(a) (i) What is the speed of the bail at the highest point?
L 1

L ,

Speed = .....
(ii) At what speed does the ball leave the girl's hand?

SDeed =

(iii) How long does the ball take to reach the highest point?
L
(__

tin" e=
t6l
(b) At what speed does the ball pass pcint h cn its way ccwn?

Sceed = i1l

o 3 EC 2C0s 0571r03'Crtt 05 ffurn over

 4 For
b,amineis
Use
3 Fig. 3.1 shows a box of mass 2400 kg. The density of water = 1000 kdm3.

2m

Fig. 3.1

(a) Calculate the density of the box.

\_

densitY = i3l

(b) State and explain whether the box will float or sink in water.

.121

(c) When the box is pushed across some mud with a force of 490 N, it moves with a
constant speed. When pushed across ice with the same force, it accelerates.

(i) Explain why the motions are different.

(ii) What is the resultant force on the box when pushed across mud?

l3l

o BEC 200s 0571 03,C N1C5

 5 For
Examinels
Use
(d) When the box is pushed across ice, the force of friction is 100 N

Calculate

(i) the resultant force on the box,

resultant =

(ii) the acceleration of the box on ice.

accglgration = .... .... .... .. ... .... o..........

\ t3l
)
t
4 An arrow of mass 0.25 kg is shot vertically upwards from a bow. The arrow takes off with a
velocity of 10 mis.

(a) Calculate the kinetic energy of the arrow at take off.

kinetic gngrgy = .... o.,........ .... ...... . L21 ,.lr)

(b) How much potential energy will the arrow have gained by the tirne it reaches the highest
point? Neglect air resistance.

L
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potential energy - t1j

(c) Calculate the maximum height reached by the arrcw.

rnaxirnum heighi = .t3j

0 BEC 2005 05;i, O3O,NC5 [Turn over

 6 Fu
Ltamrner's
Ux
5 Fig. 5.1 shows particles of air trapped in a sealed syringe

syringe

piston

Fig. 5.1

The piston is pushed half way into the syringe.

(a) What effect does this have on

(i) the mass of the air.

n--

(ii) the number of air particles,

.1.

(iii) the pressure of th e air?

t4l

6 ln a desert, the nights are very cold and the days are very hot.

(a) Explain this in terms of heat transfer.

t3l

o SEC 200s 0571 'C3/O N/05

?
 7 For
Examiner's

(b) Fig. 6.1 shows a greenhouse. Use

window

t
!--)
t
Fig. 6.1

(i) Explain how the greenhouse traps radiation.

(ii) How does the greenhouse lose heat when the window is opened?

L
I
t3j

(c) Carbon dioxide in the atmcsphere acts like a greenhouse. The amounr of carbon
dioxide in the atmosphere is increasing.

Name the environmental effect of this increase.

f {'l
L tr

,o 3 EC 2005 C571,03CilrU05 [turn over

 8 For
Examtner s

7 A student has 1 kg of cold water at 20'C, and some hot water at 40 "C. She wants to make a
Use

water bath at 35 "C. Specific heat capacity of water = 42OO J/(kg "C).

(a) What mass of hot water must she add to the cold water?

12)

(b) What assumption did you make in your answer to (a)?

ill

8 A guitar is a source of sound. )

(a) (i) How is sound produced from the guitar?

.t1 l

(ii) Describe how the sound waves are transmitted through air. you may draw a
diagram if you wish.

.......[3]

(b) The guitar is played in a large hall and its sound seems to be prolonged

Explain why the sound seems to be prolonged.

l.t)

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 9 For
Examine/s
Use
9 Fig. 9.1 shows an object O placed near a thin converging lens.

lens

2F F F 2F
a

b Fig.9.1

(a) On Fig. 9.1, draw rays to locate the image of O. Label the image t. t3l

(b) Calculate the magnification of the image.

\*

9 BEC 2OC5 057i, C\3OrNiOS [Turn over

 Fcr
10
Examrners
Usa
10 Fig. 1 0.1 shows a method of magnetising a steel bar.

coil
steel bar

DC+
power
supply

Fig. 10.1

(a) On Fig. 10.1

(i) show the direction of the current,
(ii) label the south pole of the magnetised steel bar
12)

(b) Explain how you arrived at your answer to (a) (ii).

.121

(c) State tlvo uses cf an electromagnet.

1

2 L2)

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 11 For
Examinels

11 Fig. 11 .1 shows two identical metal spheres A and B suspended with insulating threads.
Use

insulating
thread

++
charged ++
plastic rod ++
++
++

L^
f)
Fig. 11.1

The spheres are touching each other. A positively charged plastic rod is brought near A as
shown.

(a) On Fig. '11.1 show the distribution of charges on spheres A and B. l2l
(b) Fig. 11.2 shows another charged sphere.

L ++
I +
+
++
++
+
+
+ ++ +
+ ++ +
++

Fig . 11.2

State and explain how the sphere could be discharged

. .. i3l

O BEC 2CO5 0571,03C/N,05 [Turn over

 12 For
Enminer's
Use
12 Fig . 12.1 shows two resistors connected in series.

1 0V
SI
I
i
300 Q 100

Fig. 12.1

(a) Calculate the total resistance of the two resistors.

total resistaoce = ..r,.... ..a t1l

(b) Switch S is closed and electric current passes in the circuit. I

(i) What is electric current?

(ii) Determine the current in the circuit.

current = ...... .. ... .. ... .A t4]

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 13 For
Examine/s

13 Fig. 13.1 shows a wire connected to a centre-zero galvanometer. Part of the wire is held
Use

between the poles of a magnet.

Fig. 13.1

t)
(_
When the wire is moved vertically downwards with a speed of 0.5 m/s, the galvanometer
needle is deflected 2 divisions to the left.

(a) On Fig. 13.1 , show the direction of the current in the wire during the dow'nward motion.
[1]

(b) Describe the deflection of the galvanometer needle when the wire is moved

(i) vertically downwards at 0.2S m/s,

(ii) vertically upwards at 1 m/s.

\.
(__
t3l

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 14

14 An industry operating at 10kV draws 10A of current from the secondary coil of a 100% efficient
transformer. The input voltage to the transformer is 40 kV.

(a) What is the current in the primary coil of the transformer?

CUl[eflt = 121

(b) The transformer has 200 turns in the primary coil.

How many turns does it have in the secondary coil?

number of turns = 121

(c) ln practice, a transformer is not 100% efficient. State and explain one way in wnich energy
may be lost from a transformer.

.121

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