b1004
DESCRIPTION
B1004 Polytechnics Final ExamTRANSCRIPT
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CONFIDENTIAL B1004
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INSTRUCTION: Answer FOUR (4) from SIX (6) questions.
ARAHAN : Sila jawab EMPAT (4) dari ENAM (6) soalan.
QUESTION 1
a) Convert:
i) 67 cm3/minute into m
3/h (3 marks)
ii) 2.95 km2 into mm
2 (3 marks)
b) Give 3 examples of activities that involve force.
(3 marks)
c) For each of the diagrams shown below find the resolved parts of each of the force F1
and F2 in the directions of x-axis and y-axis
i. ii.
(16 Marks)
10° 60°
F1
8 N
F2
8 N
x
y
x
30°
F2
4 N
F1
6 N
y
30°
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SOALAN 1
a) Tukarkan unit-unit berikut :
i) 67 cm3/minit ke m
3/j (3 markah)
ii) 2.95 km2 ke mm
2 (3 markah)
b) Berikan tiga contoh aktiviti yang melibatkan daya
(3 markah)
c) Berdasarkan gambarajah yang ditunjukkan di bawah, pecahkan daya-daya F1 dan F2
kepada paksi-x dan paksi-y
i. ii.
(16 Markah)
10° 60°
F1
8 N
F2
8 N
x
y
x
30°
F2
4 N
F1
6 N
y
30°
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QUESTION 2
a) Define the following
i) Displacement
ii) Speed
iii) Velocity
iv) Acceleration
(8 Marks)
b) A car accelerates uniformly from rest to a velocity of 100 m/s in 25 seconds. Find the
acceleration of the car.
(4 Marks)
c) A car starts from rest at town A accelerates uniformly to 0.4 m/s for 3 minutes. Then
the car moves for a while for 13 minute. After that the car decelerates for 5 minute
before it stop
i. Plot the graph velocity – time for the movement
ii. From the graph find the deceleration
iii. Calculate the total distance in km
(13 Marks)
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SOALAN 2
a) Berikan takrifan berikut
i. Sesaran
ii. Laju
iii. Halaju
iv. Pecutan
(8 Markah)
b) Sebuah kereta memecut dengan seragam dari keadaan rehat sehingga mencapai halaju
100 m/s dalam masa 25 saat. Berapakah pecutan kereta itu.
(4 Markah)
c) Sebuah kereta bermula dari keadaan diam dari sebuah Bandar A memecut dengan kadar
0.4 m/s selama 3 minit. Selepas itu kereta itu bergerak dengan halaju seragam selama
13 minit. Seterusnya kereta itu melalui nyahpecutan seragam selama 5 minit sebelum ia
berhenti.
i. Lakarkan graf halaju – masa untuk pergerakan ini
ii. Dari graf dapatkan kadar nyahpecutan
iii. Hitung jumlah jarak yang dilalui dalam km
(13 Markah)
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QUESTION 3
a) Define and give one example of potential energy and kinetic energy.
(8 Marks)
b) A motorcycle uses to lift up of mass 80 kg at height 90 m in 4 minutes. Calculate the
i) work done
(4 Marks)
ii) Power needed
(4 Marks)
c) A rock of mass 50 kg is released from a height of 100 m to 30 m. Calculate the
potential energy of the rock at the moment.
(4 Marks)
d) An object of mass 8 kg having a kinetic energy of 300 Joule. Calculate the velocity of
the object.
(5 Marks)
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SOALAN 3
a) Takrifkan dan beri satu contoh bagi tenaga keupayaan dan tenaga kinetik.
(8 Markah)
b) Sebuah motor digunakan untuk mengangkat 80 kg beban setinggi 90 m dalam masa 4
minit. Kirakan
i) Kerja yang dilakukan
(4 Markah)
ii) Kuasa yang diperlukan
(4 Markah)
c) Seketul batu berjisim 50 kg dijatuhkan dari ketinggian 100 m kepada 30 m. Kirakan
tenaga keupayaan batu pada ketika itu.
(4 Markah)
d) Jika satu objek yang jisimnya 8 kg mempunyai tenaga kinetik 300 Joule. Kirakan halaju
objek tersebut.
(5 Markah)
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QUESTION 4
a) Give the definition of :
i. Density of substance (2 Marks)
ii. Specific gravity (2 Marks)
b) Figure 4(b) shows an ice cube measuring 10 cm x 10 cm x 10cm floating on the surface
of water.
i. Describe a related physics principle for the floating ice cube as illustrated in
figure 4(b). (1 Mark)
ii. Determine the mass of the ice. Given the density of the ice is 0.9 gcm-3
.
(4 Marks)
iii. Calculate the mass of water displaced by the ice cube
(2 Marks)
iv. Determine the volume of water displaced by the ice cube if the water density is
1 gcm-3
(3 Marks)
ice
water
Figure 4(b)
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c) A square block of steel with a density 740 kgm-3
. The weight of the block is 197 N.
Find the mass, volume and the specific gravity of the block.
Gravity, g = 9.81 m/s2
Water density = 1000 kg/m3
(11 Marks)
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SOALAN 4
a) Berikan takrifan bagi :
i. ketumpatan bahan (2 Markah)
ii. ketumpatan bandingan (2 Markah)
b) Rajah 4(b) menunjukkan seketul kuib ais berukuran 10 cm x 10 cm x 10 cm, sedang
terapung di atas permukaan air.
i. Nyatakan prinsip yang digunakan dalam rajah 4(b) di bawah (1 Markah)
ii. Jika ketumpatan ais ialah 0.9 gcm-3
, hitungkan jisim ais itu (4 Markah)
iii. Kirakan jisim air yang disesarkan (2 Markah)
iv. Kirakan isipadu air yang disesarkan oleh ais itu sekiranya ketumpatan air ialah
1 gcm-3
(3 Markah)
Ais
Air
Rajah 4(b)
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c) Sebuah bongkah keluli segiempat sama berketumpatan 740 kgm-3
. Berat bongkah
tersebut ialah 197 N. Dapatkan jisim, isipadu dan ketumpatan bandingan bongkah
tersebut.
Tarikan graviti, g = 9.81 m/s2
Ketumpatan air = 1000 kg/m3
(11 Markah)
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QUESTION 5
a) i) Give the definition of Specific Heat (2 Marks)
ii) Give THREE (3) process of transformation heat energy (3 Marls)
b) How much heat is required to raise the temperature of 5.0 kg of steel from 20 °C to 30°
C. (Given Specific heat = 500 J kg-1
°C-1
)
(5 Marks)
c) A 0.1 kg of metal cube has been heating to a 100 °C and then transfers it into 0.12 kg of
water at 14 °C in calorimeter copper. Mass of calorimeter is 0.05 kg while a specific
heat for a copper and water are 400 J kg-1
°C-1
and 4200 J kg-1
°C-1
. If the temperature
of water and calorimeter increase to 21 °C, find the specific heat of metal.
(15 Marks)
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SOALAN 5
a) i) Takrifkan maksud Muatan Haba Tentu (2 Markah)
ii) Nyatakan TIGA (3) proses pemindahan tenaga haba (3 Markah)
b) Hitungkan kuantiti tenaga haba yang diperlukan untuk memanaskan seketul keluli
berjisim 5.0 kg dari suhu 20 °C ke 30 °C.
(Diberi Muatan Haba Tentu keluli = 500 J kg-1
°C-1
) (5 Markah)
c) Suatu bongkah besi 0.1 kg dipanaskan kepada 100 °C dan kemudian dipindahkan
dengan cepat ke dalam 0.12 kg air pada suhu awal 14 °C dalam satu calorimeter. Jisim
calorimeter adalah 0.05kg manakala muatan haba tentu kuprum dan air masing-masing
ialah 400 J kg-1
°C-1
dan 4200 J kg-1
°C-1
. Jika suhu air dan kalorimeter meningkat ke
21 °C, hitungkan nilai muatan haba tentu besi tersebut
(15 Markah)
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QUESTION 6
a) Give the definition of Ohm’s Law (3 Marks)
b) A copper wire is connected from DVD player to a speaker. If the total length of wire is
15 m and the diameter is 0.5 m, calculate the resistance of the wire.
(Given the copper resistivity = 1.68 x 10-8
Ωm)
(6 Marks)
c) A resistors 12 Ω and 45 Ω are connected in parallel with a battery 24 V. Calculate the
i) Total resistance (4 Marks)
ii) Total current (4 Marks)
iii) The voltage for each of the resistor (3 Marks)
d) A 45V voltage flow through a capacitor which have 300 µF of capacitance. Calculate
energy that can be stored by the capacitor?
(5 Marks)
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SOALAN 6
a) Nyatakan takrifan Hukum Ohm (3 Markah)
b) Satu wayar dari jenis kuprum telah disambungkan dari pemain DVD ke pembesar
suara. Jika panjang keseluruhan wayar tersebut ialah 15 m dan berdiameter 0.5 m,
kirakan rintangan yang terhasil dalam wayar tersebut.
(Diberi kerintangan Kuprum = 1.68 x 10-8
Ωm)
(6 Markah)
c) Dalam satu perintang 12 Ω dan 45 Ω disambung secara selari dengan bateri 24 V.
Kirakan;
i) Jumlah rintangan (4 Markah)
ii) Jumlah arus (4 Markah)
iii) Voltan melalui setiap perintang (3 Markah)
d) Voltan 45V mengalir melalui kapasitor yang berkapasitan 300 µF. Kirakan tenaga yang
boleh disimpan oleh kapasitor tersebut?
(5 Markah)