# Ruang Tertutup Memiliki Tekanan

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Questions: 15 | Attempts: 428

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Pilih salah satu jawaban yang paling tepat

• 1.

### Ketika lengan kita di beri setetes alkohol, kulit kita merasakan dingin. Hal ini disebabkan…

• A.

Kalor di permukaan kulit untuk menguapkan alkohol

• B.

Suhu alkohol lebih rendah dari suhu udara

• C.

Suhu alkohol lebih rendah dari suhu kulit

• D.

Kalor dari alkohol berpindah ke permukaan kulit

A. Kalor di permukaan kulit untuk menguapkan alkohol
Explanation
When a drop of alcohol is applied to our skin, it feels cold because the heat on the surface of the skin is used to evaporate the alcohol.

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• 2.

### Berikut ini pernyataan yang paling benar mengenai standar deviasi dalam pengukuran.

• A.

Makin besar standar deviasi menunjukkan pengukuran makin teliti

• B.

Makin besar standar deviasi maka peluang benar hasil pengukuran itu makin besar

• C.

Makin besar standar deviasi berarti makin besar kegunaan hasil pengukuran itu

• D.

Makin besar standar deviasi menunjukkan tingkat akurasi pengukuran makin tinggi

B. Makin besar standar deviasi maka peluang benar hasil pengukuran itu makin besar
Explanation
The statement "Makin besar standar deviasi maka peluang benar hasil pengukuran itu makin besar" is the most accurate statement regarding standard deviation in measurement. It suggests that as the standard deviation increases, the likelihood of obtaining the correct measurement result also increases. This implies that a larger standard deviation indicates a greater range of values around the mean, which increases the chances of the true measurement falling within that range. Therefore, this statement correctly describes the relationship between standard deviation and the probability of obtaining the correct measurement result.

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• 3.

### Salah satu alasan mengapa udara yang keluar dari mulut kita di pagi hari mengembun ketika menyentuh kaca, adalah….

• A.

A. Udara sekitar kita di pagi hari sangat dingin

• B.

B. Udara yang keluar dari mulut banyak mengandung uap air

• C.

C. Udara sekitar kita di pagi hari banyak mengandung uap air

• D.

D. Udara bercampur air yang keluar dari mulut

B. B. Udara yang keluar dari mulut banyak mengandung uap air
Explanation
The correct answer is B. Udara yang keluar dari mulut banyak mengandung uap air. When we exhale, the air that comes out of our mouth is warm and contains a lot of moisture in the form of water vapor. In the morning, the surrounding air is often cooler, causing the warm, moist air from our breath to rapidly cool down. As the warm air cools, the water vapor in it condenses into tiny droplets, forming dew or frost when it touches a cold surface like glass. This is why our breath appears as visible moisture or "steam" on a cold morning.

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• 4.

### Ketika kita turun dari lift atau tangga pesawat kadang kadang terasa seperti ada letupan di dalam telinga. Hal ini disebabkan oleh….

• A.

A. Perbedaan tekanan antara di dalam dan di luar telinga

• B.

B. Gendang telinga mendapat getaran dari luar

• C.

C. Udara dari dalam tubuh mengalir lewat telinga

• D.

D. Saluran udara yang menuju ke telinga tersumbat

A. A. Perbedaan tekanan antara di dalam dan di luar telinga
Explanation
When we descend in a lift or airplane, the pressure outside our ears increases while the pressure inside our ears remains the same. This creates a pressure difference between the inside and outside of the ear, causing a popping sensation. Therefore, option A is the correct answer as it explains the reason behind the sensation of a pop in the ears when descending from a lift or airplane.

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• 5.

### Suatu bahan yang biasa digunakan sebagai penahan panas akan memiliki perubahan suhu yang lambat apabila diberikan kalo. bahan itu memiliki ...

• A.

Kalor jenis kecil

• B.

Kalor jenis besar

• C.

Koefisien muai besar

• D.

Koefisien muai kecil

B. Kalor jenis besar
Explanation
A material with a high specific heat capacity will have a slow temperature change when heat is applied. This is because a large amount of heat energy is required to raise the temperature of the material. Therefore, a material with a high specific heat capacity, or kalor jenis besar, will be a good heat insulator as it can absorb a large amount of heat without a significant increase in temperature.

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• 6.

### Gas ideal dalam ruang tertutup dipanaskan pada volume tetap. Kalor yang diserap gas hanya digunakan untuk menaikkan suhu gas tersebut. Kenaikan suhu gas tersebut disebabkan karena ….

• A.

Massa jenis rata-rata molekul-molekul menjadi kecil

• B.

Volume rata-rata molekul gas menjadi besar

• C.

Kecepatan rata-rata molekul gas menjadi besar

• D.

Frekuensi tumbukan molekul-molekul gas terhadap dinding meningkat

C. Kecepatan rata-rata molekul gas menjadi besar
Explanation
When an ideal gas is heated at constant volume, the heat absorbed by the gas is used to increase the kinetic energy of the gas molecules. This increase in kinetic energy leads to an increase in the average speed of the gas molecules, resulting in an increase in temperature. Therefore, the correct answer is "kecepatan rata-rata molekul gas menjadi besar" (the average speed of the gas molecules becomes larger).

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• 7.

### Lintasan Planet mengitari Matahari berupa elips yang mendekati lingkaran, dengan Matahari terletak pada salah satu titik apinya, jarak Planet ke Matahari besarnyaberubah-ubah, demikian pula gaya gravitasi oleh Matahari pada Planet besarnyapun berubah-ubah. Sebagai akibatnya maka gerakan Planet ….

• A.

Memiliki kecepatan terbesar di titik aphelion

• B.

Memiliki kecepatan terkecil di titik perihelion

• C.

Kecepatan membesar ketika meninggalkan titik aphelion

• D.

Kecepatan mengecil ketika menuju titik perihelion

C. Kecepatan membesar ketika meninggalkan titik aphelion
Explanation
The correct answer is "kecepatan membesar ketika meninggalkan titik aphelion" because as the planet moves away from the aphelion (the point in its orbit farthest from the Sun), the gravitational force exerted by the Sun on the planet decreases. According to Newton's second law of motion, a decrease in the gravitational force results in an increase in the planet's velocity. Therefore, the planet's speed increases as it moves away from the aphelion.

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• 8.

### Sebuah kaleng kosong volumenya 10 liter semula terapung di danau, dengan 40% volume kaleng tercelup di air. Kemudian turun hujan dengan debit air hujan yang masuk ke dalam kaleng 2 liter per menit. Jika massa jenis air 1000 kg/m3, maka kaleng tersebut nyaris akan tercelup seluruhnya di dalam air setelah hujan turun selama ….

• A.

2,4 menit

• B.

2,5 menit

• C.

2,6 menit

• D.

3,0 menit

D. 3,0 menit
Explanation
The volume of the empty can is 10 liters, and initially, 40% of its volume is submerged in water. This means that the initial volume of water in the can is 4 liters (10 liters x 40%).

After that, it starts raining with a rainfall rate of 2 liters per minute. This means that for every minute, 2 liters of water will be added to the can.

To determine how long it will take for the can to be completely submerged, we need to find the time it takes for the volume of water in the can to reach 10 liters.

Since the rainfall rate is 2 liters per minute, it will take 3 minutes (10 liters - 4 liters = 6 liters / 2 liters per minute) for the can to be completely submerged. Therefore, the correct answer is 3,0 minutes.

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• 9.

### Gas ideal dalam ruang tertutup memiliki tekanan P, volume V, dan suhu mutlak T. Gas mula-mula dipanaskan secara isobarik sampai volumenya menjadi 3 V, setelah itu mengalami kompresi isotermik sampai volumenya 2 V. Tekanan dan suhu mutlak gas pada keadaan yang terakhir ini adalah ….

• A.

3,0 P dan 2/3 T

• B.

2,0 P dan 3/2 T

• C.

1,5 P dan 3 T

• D.

1,5 P dan 3/2 T

C. 1,5 P dan 3 T
Explanation
According to the ideal gas law, PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature. In this question, the gas is initially heated at constant pressure (isobaric process) until the volume becomes 3V. This means the temperature increases to T'. Then, the gas undergoes an isothermal compression until the volume becomes 2V. Since the process is isothermal, the temperature remains constant at T'. From the ideal gas law, we can calculate that the final pressure is 1.5P and the final temperature is 3T.

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• 10.

### Pernyataan yang benar tentang amplitudo  gelombang stasioner berikut ini adalah ….

• A.

• B.

berubah secara sinusoida

• C.

Dua kali amplitudo gelombang berjalan (2A)

• D.

Sama dengan amplitudo gelombang berjalan (A)

B. berubah secara sinusoida
Explanation
The correct answer is "berubah secara sinusoida" which means "it changes sinusoidally". This means that the amplitude of a stationary wave varies periodically in a sinusoidal manner.

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• 11.

### Yang termasuk parameter gerak berikut ini adalah....

• A.

Kecepatan dan percepatan

• B.

Perpindahan dan kecepatan

• C.

Kecepatan dan momentum

• D.

Impuls dan momentum

C. Kecepatan dan momentum
Explanation
The correct answer is "kecepatan dan momentum". Kecepatan (velocity) is a parameter that describes the rate of change of an object's position over time. Momentum is a parameter that describes the quantity of motion possessed by an object, which is determined by its mass and velocity. Both kecepatan and momentum are related to the motion of an object and are used to analyze and describe its behavior.

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• 12.

### Besarn berikut ini TIDAK mempengaruhi cepat rambat gelombang pada dawai

• A.

Diameter dawai

• B.

Panjang dawai

• C.

Gaya tegangan tali

• D.

Massa jenis dawai

B. Panjang dawai
Explanation
The length of the wire does not affect the speed of wave propagation because the speed of a wave depends on the tension and the mass per unit length of the wire, not its length. Therefore, changing the length of the wire will not have any impact on the speed of the wave.

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• 13.

### Besarnya intensitas gelombang yang diserap oleh suatu medium bergantung pada...

• A.

Massa jenis medium

• B.

Kerapatan pori medium

• C.

Jenis jaringan dan tebalnya

• D.

Banyaknya air dalam medium

C. Jenis jaringan dan tebalnya
Explanation
The intensity of a wave absorbed by a medium depends on the type of tissue it passes through and the thickness of the tissue. Different tissues have different absorption properties, and thicker tissues will absorb more of the wave's energy. The other options, such as the density of the medium or the amount of water in the medium, are not directly related to the absorption of wave intensity.

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• 14.

### Pernyataan berikut yang benar adalah...

• A.

Uap air pada tekanan udara tinggi akan lebih mudah mengembun apabila didinginkan

• B.

Uap air pada tekanan udara rendah akan lebih mudah mengembun jika didinginkan

• C.

Laju mengembunnya uap air tidak bergantung pada besarnya tekanan udara

• D.

Pengembunan uap air hanya bergantung pada suhu saja

B. Uap air pada tekanan udara rendah akan lebih mudah mengembun jika didinginkan
Explanation
When the air pressure is low, the molecules of water vapor are more spread out and have less force holding them together. This makes it easier for them to condense and form liquid droplets when cooled. Therefore, water vapor at low air pressure is more likely to condense and form dew or fog when cooled, making the statement "Uap air pada tekanan udara rendah akan lebih mudah mengembun jika didinginkan" correct.

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• 15.

• A.

Kalor yang diserap seluruhnya untuk kenaikan tekanan di dalam sistem

• B.

Kalor yang diserap seluruhnya untuk kenaikan energi dalam sistem

• C.

Kalor yang diserap seluruhnya untuk usaha luar dari sistem

• D.

Tidak ada pertukaran kalor antara sistem dan lingkungan

C. Kalor yang diserap seluruhnya untuk usaha luar dari sistem
Explanation
The correct answer for this question is "Kalor yang diserap seluruhnya untuk usaha luar dari sistem." This means that in an isothermal process, all the heat absorbed is used for external work done by the system. In an isothermal process, the temperature remains constant, so there is no change in internal energy. Therefore, any heat absorbed is converted into work done by the system.

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• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Nov 23, 2013
Quiz Created by
Ekonuphysedu