Showing posts with label SBP 2018. Show all posts
Showing posts with label SBP 2018. Show all posts

16.5.19

9A7m - Transostor sebagai suis

4     Diagram 4.1 shows a transistor circuit.
       Rajah 4.1 menunjukkan satu litar transistor.

 

Diagram 4.1
Rajah 4.1

(a)     What is the function of the circuit?
Apakah fungsi bagi litar itu?
       .....................................................................................................................................
[1 mark]
[1 markah]

(b)     (i)    What will happen to the resistance of LDR when the surrounding is dark?
Apakah yang akan berlaku kepada rintangan PPC apabila keadaan sekeliling menjadi gelap?

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

          (ii)   Based on your answer in 4 (b)(i), explain how bulb L is lighted up?
        Berdasarkan jawapan anda dalam 4 (b)(i), terangkan bagaimana lampu L               menyala?

        ..............................................................................................................................

        ..............................................................................................................................
 [2 marks]
[2 markah]


(c)     The transistor is switched on when Vp  reaches 2.0 V. The resistance of the LDR at this voltage is 10 kΩ.
Transistor dihidupkan apabila Vp mencapai 2.0 V. Rintangan PPC pada ketika ini adalah 10 kΩ.

Calculate the maximum resistance of resistor S.
Kirakan rintangan maksimum perintang S?


[2 marks]
[2 markah]
(d)     Why bulb L is connected at the secondary circuit?
Mengapa lampu L disambung pada litar sekunder?

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

[1 markah]

JAWAPAN: 

Question
Answer
Mark
4.a
As an automatic switch  // Sebagai litar suis automatik
1
4.b.i
Increase // Bertambah
1
4.b.ii
M1       The base voltage Vp increase // base current also increase
            Beza keupayaan tapak meningkat // arus tapak turut meningkat
M2       The transistor is switched on // the collector current flow // relay is switched on
            Transistor berfungsi // arus pengumpul mengalir // suis geganti dihidupkan
1

1




4.c
4    =          Rs       x 6 
Rs  +  10
Rs  = 20 kΩ
1

1
4.d
Bulb L required high voltage to light up
Mentol L memerlukan beza keupayaan yang tinggi untuk menyala
1
Total
7

6a5m - pembiasan gelombang, maksud muka gelombang

2     Diagram 2 shows the plane wave fronts produced when water wave moves from region P to region Q. The frequency of waves is 10 Hz.
       Rajah 2 menunjukkan muka gelombang satah yang terhasil apabila satu gelombang air bergerak dari kawasan P ke kawasan Q. Frekuensi gelombang itu ialah 10 Hz.


(a)          What is the meaning of wave fronts?
Apakah maksud muka gelombang?
………………………………………………………………………….........………
[1 mark]
[1 markah]
(b)     (i)    Which region is deeper?
Kawasan manakah yang lebih dalam?

..............…………………………………………………………………………
[1 mark]
              [1 markah]
 (ii)  Give one reason for the answer in 2 (b)(i).
Beri satu sebab bagi jawapan di 2 (b)(i).

………………………..............…………………………………………………
[1 mark]
[1 markah]

(b)   Calculate  the speed of waves in region Q.
Hitung laju gelombang di kawasan Q.



[2 marks]
[2 markah]

JAWAPAN : 


Question
Answer
Mark
2.a
The line that joining all points in phase
1
2.b.i
Region P
1
2.b.ii
Wave length higher/longer // Distance between the two consecutives wave front is more/bigger
1
2.c
M1  λ  =  0.06  // 0.02
3
M2  v  =  10 x 0.02 // 0.2 ms-1
1

1
Total
5

2A4m - graf halaju-masa



1          Diagram 1 shows a velocity-time graph of a motorcycle travelling on a straight road.
Rajah1 menunjukkan graf halaju-masa bagi sebuah motosikal yang sedang bergerak    
atas jalan yang lurus.
                     


Diagram 1
Rajah 1

(a)          What is the meaning of velocity?
Apakah yang dimaksudkan dengan halaju?

…...............…………………………………………………………………………..
[1 mark]
 [1 markah]

(b)          Name the physical quantity represents by the gradient of the graph.
Namakan kuantiti fizik yang diwakili oleh kecerunan graf tersebut.

................…………………………………………………………………………….
[1 mark]
 [1 markah]

(c)          State the motion of the motorcycle at QR.
Nyatakan gerakan motosikal di QR.

…................………………………………………………………………………….
[1 mark]
 [1 markah]

(d)          What will happen to the velocity of the motorcycle at PQ if the engine thrust increases?
Apakah yang akan berlaku kepada halaju motosikal pada PQ jika tujahan enjin bertambah?

.....................................................................................................................................
[1 mark]
[1 markah]
JAWAPAN :

Question
Answer
Mark
1.a
Rate of change of displacement/
Kadar perubahan sesaran
1
1.b
Acceleration / Pecutan
1
1.c
deceleration / nyahpecutan //
velocity decreases /halaju berkurang
1
1.d
increases / bertambah
1
Total
4