NAME

SCHOOL NAME

CLASS/SECTION

PHYSICS October 2014 1 hour

Students answer on the Question Paper.

Additional Materials: Mathematical set Ruler

READ THESE INSTRUCTIONS FIRST Write your name, the name of your school and your class/section in the spaces provided above. Write in dark blue or black ink. You may use a soft pencil for any diagram, graph or rough working. Any rough working should be done in this booklet. Do not use correction fluid. There are 6 questions in this paper. Check that this document consists of 12 printed pages. Any discrepancy in the document must be immediately notified to the responsible officer in your school. Answer all questions. All answers must be written in the spaces provided. Show all your workings. Give all your answers using appropriate units wherever applicable. You may assume g = 10 m/s

2. You may also assume that 1 kg weighs 10 N. Diagrams are not drawn to scale. The number of marks is given in brackets [ ] at the end of each question or part question. The total of the marks for this paper is 50.

MINISTRY OF EDUCATION AND HUMAN RESOURCES MAURITIUS EXAMINATIONS SYNDICATE

NATIONAL ASSESSMENT AT FORM III

2

1. For each item below, there is ONLY one correct answer.

Draw a circle around the letter which shows the correct answer.

(a) Fig. 1.1 shows a rocking chair which has a curved band of about half a metre.

Fig. 1.1

Which instrument will measure the length of the curved band most accurately?

A a metre rule B a tape measure

C a vernier caliper D a half metre rule

(b) Which one of the following is an example of a luminous object?

A Earth B Sun

C Moon D Mars

(c) Fig. 1.2 shows an electrical connecting wire.

Fig. 1.2 Which one of the following statements is true?

A P is made of copper.

B Q is made of plastic.

C P is a conductor of electricity.

D Q is a conductor of electricity.

0.5 m

P Q

curved band

3

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(d) The speed-time graph below represents the motion of an object.

Which statement about this object is correct?

A The object is moving with uniform speed.

B The object is moving with decreasing speed.

C The object is moving with increasing speed.

D The object is moving with zero speed.

(e) A man regularly goes to the gym to lift weights.

Fig. 1.3 What is the work done by the man when he holds the weights as shown in Fig. 1.3?

A 0 J B 200 J C 400 J D 800 J

[Total Question 1 = 5 marks]

speed

time 0 0

200 N 200 N

2.0 m

4

2. (a) Draw a line from each circuit symbol below to the correct name.

[4]

(b) Paul’s bicycle has a front lamp and a rear lamp. Both lamps are connected to the same battery as shown in Fig. 2.1.

Fig. 2.1 Fig. 2.2. shows the circuit diagram for the bicycle lamps.

Fig. 2.2

(i) Which type of circuit is shown in Fig. 2.2, series or parallel? ________________________ [1]

front lamp rear lamp

battery

12 Ω 8 Ω front lamp

rear lamp

circuit symbol name

ammeter

cell

switch

resistor

bulb

A

5

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(ii) On Fig. 2.2, place letter X to show the position of a switch which will turn

only the front lamp on and off. [1]

(iii) On Fig. 2.2, place letter Y to show the position of a switch which will turn

both lamps on and off at the same time. [1]

(iv) Calculate the total resistance of the circuit shown in Fig. 2.2.

total resistance = _________________ [2]

[Total Question 2 = 9 marks]

3. (a) Fig. 3.1 shows four thermometers.

Which one of the thermometers would you use to measure a temperature of 79 oC? Thermometer ___________ [1] Give a reason for your answer. Reason: ______________________________________________________________

______________________________________________________________ [1]

Fig. 3.1

P Q R S

6

(b) Fig 3.2 shows the same spring balance in three different situations: situation A, B and C. The spring balance has a zero error.

Fig. 3.2

(i) State the value of the zero error shown in Fig. 3.2 A.

zero error = ______________ [1]

A C B

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(ii) State one precaution which you should take when using the spring balance.

___________________________________________________________________

_________________________________________________________________ [1]

(iii) A bag of apples is attached to the spring balance as shown in Fig. 3.2 B. Calculate the real mass of the bag of apples shown.

real mass = ____________________ [2]

(iv) The real mass of a bag of fruits is 600 g.

On Fig. 3.2 C, draw an arrow to indicate the reading which the spring balance would show.

[2]

[Total Question 3 = 8 marks]

8 4. During winter, Naz often rubs her hands together to keep herself warm as shown in Fig. 4.1.

Fig. 4.1

(a) State the energy conversion that takes place as she rubs one hand against the other.

______________________________________________________________________

____________________________________________________________________ [1]

(b) Table 4.1 below shows the average force which Naz and her friends, Jess and Tina, use

to rub one hand against the other in one movement.

Table 4.1

Naz

Jess

Tina

Average Force (N)

1.2

1.2

1.5

Average Distance (m)

0.08

0.06

0.06

(i) State the formula used to calculate work done.

_______________________________________________________________ [1]

(ii) Without any calculation, deduce from Table 4.1 who does the least amount of

work. Give two reasons for your answer.

Name: _____________________ [1]

Reason: ___________________________________________________________

________________________________________________________ [2]

(iii) Tina rubs her hands 8 times in 3 s. Calculate the average power which she

develops.

power = _________________[4]

[Total Question 4 = 9 marks]

9

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5. (a) A car starts from rest and moves with uniform acceleration for 5 s. It reaches a maximum

speed of 10 m/s. It then moves at this speed for 15 s.

Fig. 5.1

(i) On Fig. 5.1, draw a speed-time graph to illustrate the motion of the car. [2]

(ii) Calculate the acceleration of the car.

acceleration = _____________________ [2]

(iii) Distinguish between speed and velocity.

___________________________________________________________________

___________________________________________________________________ _________________________________________________________________ [2]

speed/(m/s)

5 0 10 15 20 25 30 time/s

5

10

15

20

10 5. (b) A truck moves 9 km west and then 12 km north as shown in Fig. 5.2.

Fig. 5.2

(i) Calculate the total distance travelled by the truck.

total distance = ____________________ [1]

(ii) Determine the displacement of the truck.

displacement = _______________________________ [3]

[Total Question 5 = 10 marks] 6. (a) Jay shines a ray of light at a mirror.

He measures the angle of reflection for different angles of incidence. His results are shown in Table 6.1.

Table 6.1

angle of incidence ( 0 ) 30 40 50 60 70

angle of reflection ( 0 ) 30 40 50 65 70

State which angle was not measured accurately.

__________ [1]

Give a reason for your answer. ________________________________________________________________________

_____________________________________________________________________ [1]

9 km

12 km

11

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(b) Fig. 6.1 shows a fish tank. The surface of the water acts like a mirror. From its current position, the fish can see the toy windmill reflected at the surface of the water.

Fig. 6.1

(i) Complete the ray diagram in Fig. 6.1 to show how the fish can see the toy windmill. Use arrows to show the direction of travel of the ray of light.

[2]

(ii) Using a protractor, measure the angle of incidence.

angle of incidence = ___________________ [1]

surface of water (mirror)

12

(c) Uncle Ben is looking at the toy windmill from above the fish tank as shown in Fig. 6.2.

Fig. 6.3

Fig. 6.2 (i) He sees the toy windmill because of refraction.

Explain what is meant by refraction.

___________________________________________________________________

_________________________________________________________________ [2]

(ii) Using a ruler, draw a ray diagram on Fig. 6.2 to show how Uncle Ben can see the

toy windmill.

Use arrows to show the direction of travel of light.

[2]

[Total Question 6 = 9 marks]

water

air