7/29/2019 ps1 f5

1/11

Name:. Date:

4551PhysicsMarch2013

SMJK KATHOLIK, MELAKA

______________________________________________________________________

PENILAIAN SEMESTER 1

FORM 5

______________________________________________________________________

PHYSICS

1 hour

______________________________________________________________________

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

QUESTIONS MARKS

1

2

3

4

5

6

7

______________________________________________________________________

Kertas soalan ini mengandungi 10 halaman bercetak

Prepared by, Checked by, Verified by,

..(MISS NURUL AESYAH)Subject Teacher

(PN. NABILLAH)Science Panel Head

..(PN. LIM LAY KUAN)Head of Science & MathematicsDepartment

1. Answer all questions.Write youranswer in the spaces provided on thequestion paper answer.

2. The diagrams in the questions providedare not

drawn to scale unless stated.3. The marks allocated for each sub-part ofa

question are shown in brackets.4. You may use a non-programmablescientific

calculator.

7/29/2019 ps1 f5

2/11

1 Figure 1 shows an image of letter FIZIK when viewed through a glass of water.

Figure 1

(a)State the light phenomenon that causes the images of FIZIK to be enlarged.

[1 mark]

(b) What is the change in size of the image if the water is replaced with a transparent liquidof a greater density ?

[1 mark]

(c) The glass of water is replaced with a lens M with focal length of 10 cm. The distance

between the book cover and the centre of the lens is 8 cm.

It is observed that the image FIZIK is enlarged(i) Name the type of lens M.

..

[1 mark]

(ii) Calculate the distance of the image from lens M.

[2 marks]

7/29/2019 ps1 f5

3/11

2. Two similar loudspeakers are placed 0.8m apart. They emit a coherentsound wave. A girlwalks slowly parallel to the two loudspeakers at a distance 3.2m in front of the loudspeakers.She hears a loud sound and weak sound alternately. Figure 2 shows the positions of theloud and weak sounds.

Figure 2

(a) What is meant by a coherentwave ?

[1mark]

(b) The distance between three position of the loud sound is 4.5m, as shown in Figure above. Calculatethe wavelength of the sound wave.

7/29/2019 ps1 f5

4/11

[3marks]

(c) The loud sound is heard due to the constructive interference of the sound waves. How it isformed?

[1mark]

3.

A student carried out an experiment to investigate the relationship between object distance, u, and

image distance, v, for a convex lens. The student used various values ofu and recorded thecorresponding values ofv. The student then plotted the graph of uv against u + v as shown inFigure 3.

500

450

400

3505

3000

250

2000

150

uv/ cm2

7/29/2019 ps1 f5

5/11

Figure 3

a) Based on the graph in Figure 3,

(i) state the relationship between uv and u + v

[1 mark]

(ii) determine the value ofu + v when the value ofuv = 400 cm2. Show on the graph how youobtained the value of u + v.

From the value ofu + v obtained, calculate the image distance, v when u = 20 cm.

[3 marks]

(iii) calculate the gradient of the graph. Show clearly on the graph how you obtained the valuesneeded for the calculation.

[3 marks]

b) Given that the relationship between u, v and focal length,fof the convex lens used, is representedby the equation

1 + 1 = 1

u v f

Derive an equation which gives the relationship between uv and (u + v ).

100

50

10 20 30 40 50

u + v/ cm

10 20 30 40 50

u + v

7/29/2019 ps1 f5

6/11

[2 marks]

c) Using the equation derived in (b), and the value of gradient calculated in (a)(iii), determine thefocal length of the lens used in the experiment.

[2 marks]

d) State one precaution taken to ensure the accuracy of the experiment.

[1 mark]

4. Figure 4 shows the arrangement of the apparatus for an experiment to study a wave phenomenon.

Figure 4

Figure 4 shows the bright and dark bands of the waves pattern formed on the white paper when planewaves passes through the narrow and wide gaps.

Narrow gap Wide gapFigure 4 (a) Figure 4 (b)

(a) Name the wave phenomenon shown in Figure 4 (a) and Figure 4 (b)

.. [1 mark]

(b) (i) Explain how the dark and light bands are formed on the white paper.Label the dark and light bands. [4 marks]

7/29/2019 ps1 f5

7/11

5.

The figure above shows a graph of electric current against potential difference for three differentconductors X, Y and Z.

(a) Among the three conductors, which conductor obeys Ohms law?..

[1 mark]

(b) State Ohms law...

Figure / Everycrests will converge thelight, bright fringes areformed

a) ---------------------------------------------------------------------------------------------------------

------------------------

b) ---------------------------------------------------------------------------------------------------------

------------------------

c) ---------------------------------------------------------------------------------------------------------

------------------------

d) .......................................................................................................................

7/29/2019 ps1 f5

8/11

[1 mark]

(c) Resistance, R is given by the formula R = V/I. What is the resistance of X when the currentflowing through it is 0.4 A? Show clearly on the graph how is the answer obtained.

From the graph I against V;

[3 mark]

6. The figure below shows an electric kettle connected to a 240 V power supply by a flexiblecable. The kettle is rated 240 V, 2500 W.

The table below showsthe maximum electriccurrent that is able toflow through wires ofvarious diameters.

diameter of wire /mm

maximum current /A

0.80 8

1.00 10

1.20 13

1.40 15

(a) What is the current flowing through the cable when the kettle is switched on?

[2 mark]

I = P/V = 2500 / 240 = 10.4 A

(b) Referring to the table above,

i. What is the smallest diameter wire that can be safely used for this kettle?

[1 mark]

1.20 mm

7/29/2019 ps1 f5

9/11

ii. Explain why it is dangerous to use a wire thinner than the one selected in b(i)

[2 marks]i

(c) State one precautionary measure that should be taken to ensure safe usage of the kettle.

[1 mark]

(d) Mention one fault that might happen in the cable that will cause the fuse in the plug to melt.

... [2 mark]Short circuit might occur

7. Figure below shows an immersion heater with specification of 240 V , 1000 W.

(a)Name one suitable material to be used as a heating element in the immersion heater.

.......................................................................................................................................[ 1 mark]

(b) The immersion heater is connected to a 240 V supply.Calculate ;

(i) the current that passes through the immersion heater ,

7/29/2019 ps1 f5

10/11

[2 marks]

(ii) the resistance of the immersion heater.

[ 2 marks]

(c) A student conducts an experiment to compare the heating effect of immersion heaters P, Q andR. The volume and initial temperature of the water is fixed.

Table below shows the result of the experiment.

(i) State the energy change that occurs when the immersion is switched on.

...................................................................................................................... [1 mark]

(ii) Calculate the energy supplied by each of the immersion heaters P, Q and R to start boiling thewater.

Immersion

Heater

Potential difference / V Current / A Time for the water to startboiling / minute

P 240 6.0 8.0

Q 240 5.0 10.0

R 240 4.0 9.0

7/29/2019 ps1 f5

11/11

[ 4 marks]