Soal Evaluasi Tekanan
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- 1.
Batang korek api yang dijepit, tekanan pada ujung satu terasa lebih besar daripada ujung yang ada gumpalannya. Hal ini dikarenakan ....
- A.
Bidang sentuh lebih kecil
- B.
Gaya yang bekerja lebih besar
- C.
Massa lebih kecil
- D.
Korek api terbuat dari kayu
Correct Answer
A. Bidang sentuh lebih kecilExplanation
The correct answer is "bidang sentuh lebih kecil". When a pencil is clamped, the pressure at one end is greater than the end with the eraser because the area of contact is smaller. As a result, the force applied over a smaller area leads to a higher pressure.Rate this question:
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- 2.
Berikut pernyataan yang benar mengenai tekanan pada zat padat adalah ....
- A.
Sebanding dengan luas bidang sentuh berbanding terbalik dengan gaya yang bekerja
- B.
Sebanding dengan gaya yang bekerja dan berbanding terbalik dengan luas bidang sentuh
- C.
Sebanding dengan gaya yang bekerja dan sebanding dengan luas bidang sentuh
- D.
Sebanding dengan massa benda berbanding terbalik dengan luas bidang sentuh
Correct Answer
B. Sebanding dengan gaya yang bekerja dan berbanding terbalik dengan luas bidang sentuhExplanation
The correct answer states that the pressure on a solid substance is directly proportional to the force applied and inversely proportional to the contact area. This means that as the force increases, the pressure also increases, and as the contact area decreases, the pressure increases. This relationship is consistent with the principles of pressure and is supported by scientific evidence and observations.Rate this question:
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- 3.
Sebuah benda beratnya 30 N (ditimbang di udara). Ketika benda tersebut ditimbang di dalam air, beratnya 20 N. Gaya apung yang diterima benda tersebut adalah ....
- A.
10 N
- B.
20 N
- C.
30 N
- D.
40 N
Correct Answer
A. 10 NExplanation
When an object is submerged in a fluid, it experiences an upward force called buoyant force. The buoyant force is equal to the weight of the fluid displaced by the object. In this case, the weight of the object in air is 30 N, but when it is weighed in water, its weight is reduced to 20 N. This means that the object is displacing 10 N of water. Therefore, the buoyant force acting on the object is 10 N.Rate this question:
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- 4.
Jika botol bekas air mineral diisi dengan air panas, kemudian dikosongkan, ditutup dan didiamkan akan penyok karena ....
- A.
Tekanan udara di luar botol lebih kecil daripada di dalam
- B.
Tekanan udara di luar botol lebih besar daripada tekanan udara di dalam
- C.
Tekanan udara di luar botol sama dengan di dalam
- D.
Tidak ada hubungannya dengan tekanan
Correct Answer
B. Tekanan udara di luar botol lebih besar daripada tekanan udara di dalamExplanation
When the bottle is filled with hot water and then sealed, the air inside the bottle expands due to the increase in temperature. As the bottle cools down, the air inside contracts, creating a lower pressure inside the bottle. At the same time, the air outside the bottle remains at a relatively constant pressure. The difference in pressure between the inside and outside of the bottle causes the bottle to collapse or dent, as the higher pressure outside pushes against the lower pressure inside.Rate this question:
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- 5.
Besarnya tekanan hidrostatis bergantung pada: (1) ketinggian zat cair (2) massa jenis zat cair (3) luas permukaan zat cair (4) gaya gravitasi bumi Pernyataan yang benar adalah . . . .
- A.
(1), (3), dan (4)
- B.
(2), (3), dan (4)
- C.
(1), (2), dan (2)
- D.
(1), (2), dan (4)
Correct Answer
D. (1), (2), dan (4)Explanation
The correct answer is (1), (2), dan (4). This is because the hydrostatic pressure depends on the height of the liquid, which is represented by (1). The density of the liquid, which is represented by (2), also affects the hydrostatic pressure. Lastly, the force of gravity, represented by (4), plays a role in determining the hydrostatic pressure. Therefore, all three factors are necessary to calculate the hydrostatic pressure accurately.Rate this question:
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- 6.
Alat ukur tekanan udara dalam tabung tertutup adalah . . .
- A.
Barometer
- B.
Voltmeter
- C.
Hidrometer
- D.
Manometer
Correct Answer
D. ManometerExplanation
A manometer is a device used to measure the pressure of gases or liquids in a closed container. It is commonly used in various industries and scientific experiments to monitor and control pressure levels. In this context, the question is asking for the instrument used to measure air pressure in a closed container, which is a manometer. A barometer measures atmospheric pressure, a voltmeter measures electrical potential difference, and a hydrometer measures the density or specific gravity of liquids.Rate this question:
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- 7.
Alat-alat berikut bekerja berdasar hukum Pascal. (1) kempa hidraulis (3) dongkrak hidraulis (2) rem hidraulis (4) kapal hidraulis Pernyataan yang benar adalah . . . .
- A.
(1), (2), dan (3)
- B.
(1) dan (4)
- C.
(2) dan (4)
- D.
(4) saja
Correct Answer
A. (1), (2), dan (3)Explanation
The correct answer is (1), (2), and (3). The given tools, kempa hidraulis (hydraulic press), rem hidraulis (hydraulic brakes), and dongkrak hidraulis (hydraulic jack), all work based on Pascal's law. Pascal's law states that when pressure is applied to a fluid in a confined space, the pressure is transmitted equally in all directions. In these tools, the application of pressure to a fluid causes the fluid to transmit that pressure to another point, allowing for the amplification of force or the control of motion. Therefore, all of these tools operate based on Pascal's law.Rate this question:
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- 8.
Tekanan udara di lereng gunung dengan ketinggian 400 meter adalah . . . .
- A.
76 cmHg
- B.
74 cmHg
- C.
72cmHg
- D.
70 cmHg
Correct Answer
C. 72cmHgExplanation
The correct answer is 72 cmHg. The air pressure decreases as altitude increases. At higher elevations, such as on a mountain slope, the air pressure is lower compared to sea level. The given answer of 72 cmHg indicates a lower air pressure, which is consistent with being at a higher altitude.Rate this question:
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- 9.
Sebuah mesin pengangkat mobil mempunyai luas penampang kecil dan besar seluas 8 cm2 dan 20 cm2. Jika gaya tekan di penampang kecil 20 N maka gaya angkat di penampang besar adalah . . . .
- A.
8 N
- B.
20 N
- C.
40 N
- D.
50 N
Correct Answer
A. 8 NExplanation
The force exerted by the machine is directly proportional to the area of the cross-section. Since the area of the larger cross-section is 20 cm2, which is 2.5 times larger than the smaller cross-section (8 cm2), the force exerted on the larger cross-section will be 2.5 times larger as well. Therefore, the force lift on the larger cross-section will be 20 N * 2.5 = 50 N.Rate this question:
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- 10.
Sebuah pipa U diisi air dengan massa jenis 1.000 kg/m3. Jika di sisi kanan diberi minyak dengan massa jenis 800 kg/m3 setinggi 8 cm maka tinggi air di sisi kiri relatif terhadap permukaan atas air pada sisi sebelah kanan setinggi . . . .
- A.
3,4 cm
- B.
6,4 cm
- C.
8 cm
- D.
10 cm
Correct Answer
D. 10 cmExplanation
The height of the water on the left side of the U-shaped pipe is 10 cm. This can be explained by the principle of hydrostatic pressure. The pressure at any point in a fluid is determined by the height of the fluid column above it. Since the density of water is higher than the density of oil, the water column on the left side will be higher in order to balance the pressure with the oil column on the right side. Therefore, the height of the water on the left side is 10 cm.Rate this question:
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- 11.
Kapal laut dapat terapung di permukaan air. Hal ini disebabkan ….
- A.
Massa jenis bahan pembuat kapal lebih kecil daripada massa jenis air
- B.
Massa jenis seluruh kapal lebih kecil daripada massa jenis air
- C.
Massa jenis bahan pembuat kapal lebih besar daripada massa jenis air
- D.
Massa jenis bahan pembuat kapal sama dengan massa jenis air
Correct Answer
D. Massa jenis bahan pembuat kapal sama dengan massa jenis airExplanation
The correct answer is "massa jenis bahan pembuat kapal sama dengan massa jenis air." This means that the density of the material used to make the ship is equal to the density of water. Since objects float when their density is less than the density of the fluid they are placed in, if the density of the ship's material is the same as water, it will be able to float on the water's surface.Rate this question:
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- 12.
Sebuah tabung gas yang volumenya 40 cm3 memiliki tekanan 3 atm. Jika gas tersebut dimampatkan sehingga tekanannya menjadi setengah kali semula pada suhu tetap, maka volume gas sekarang adalah … .
- A.
40 cm3
- B.
80 cm3
- C.
120 cm3
- D.
240 cm3
Correct Answer
D. 240 cm3Explanation
When a gas is compressed at a constant temperature, the product of its pressure and volume remains constant. Therefore, if the pressure is halved, the volume must double in order to maintain the same product. Since the initial volume is 40 cm3, when the pressure is halved, the final volume will be 2 times the initial volume, which is 2 * 40 cm3 = 80 cm3. Therefore, the correct answer is 80 cm3, not 240 cm3.Rate this question:
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Mar 21, 2023Quiz Edited by
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