Page 34 - Pra U STPM 2021 Penggal 1 - Physics

Physics Term 1 STPM STPM Model Paper (960/2)
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12. An ideal gas in a container of volume 2.0 × 10 m is at a temperature of 300 K and pressure
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of 1.10 × 10 Pa. How many moles of the gas is in the container?
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Suhu suatu gas unggul di dalam suatu bekas berisi padu 2.0 × 10 m ialah 300 K dan tekanan gas ialah
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1.10 × 10 Pa. Berapakah bilangan mol gas di dalam bekas itu?
A 0.44 moles B 0.88 moles C 1.13 moles D 2.27 moles
13. At room temperature, the molar heat capacity of a gas at constant volume, C is xR. If C is
p,m
V,m
C
the molar heat capacity at constant pressure, what is the value of the ratio p,m ?
C v,m
Pada suhu bilik, muatan haba molar pada isi padu malar C suatu gas ialah xR. Jika C ialah muatan haba molar
p,m
V,m
C
pada tekanan malar, berapakah nilai nisbah p,m ?
A x – 1 B x + 1 C v,m C x D x
x x x + 1 x – 1
14. Two different metal rods P and Q of the same cross sectional area of 5.0 cm are joined in series
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and perfectly lagged. The lengths of the rods are 20 cm and 10 cm respectively. The thermal
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conductivity of rod P is 200 W m K and the thermal conductivity of rod Q is 400 W m K .
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The temperatures at the ends of the jointed rod are 100 C and 30 C.
o
Luas keratan rentas dua batang logam yang berlainan P dan Q adalah sama, 5.0 cm . Dua batang logam itu
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disambungkan secara siri dan ditebat dengan sempurna. Panjang P dan Q adalah masing-masing 20 cm dan 10 cm.
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Kekonduksian termal P dan Q adalah masing-masing 200 W m K dan 400 W m K . Suhu di hujung-hujung rod

gabungan adalah 100 C dan 30 C.
o
o
100°C P Q 30°C
20 cm 10 cm
What is the rate of heat flow along the joint rod?
Berapakah kadar aliran haba sepanjang rod gabungan itu?
A 4.7 W B 26.7 W C 28.0 W D 33.4 W
15. Material medium is not required if heat is transferred by
Bahan antara tidak diperlukan jika haba dipindah melalui
A conduction / kekonduksian
B convection / perolakan
C radiation / sinaran
D convection and radiation / perolakan dan sinaran
Section B (15 marks)
Bahagian B [15 markah]
Answer all the questions in this section.
Jawab semua soalan dalam bahagian ini.

16. (a) An object is projected at an angle of 45 to the horizontal. Find the value of the ratio of
o
the maximum height reached H to the range R of the projectile.
Suatu objek dilancarkan pada sudut 45 dari ufukan. Tentukan nilai nisbah tinggi maksimum H kepada julat
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R luncuran itu. [4 marks / 4 markah]

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