# Physics Check By Mr. Garry

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Gmayawin
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Quizzes Created: 1 | Total Attempts: 64
Questions: 12 | Attempts: 64

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• 1.

### Which of the following is related to the PRESSURE of GAS?

• A.

Spaces between molecules

• B.

Average speed of molecules

• C.

Collision of molecules with container

C. Collision of molecules with container
Explanation
The pressure of a gas is related to the collision of molecules with the container. When gas molecules collide with the walls of the container, they exert a force which creates pressure. The more frequent and intense the collisions, the higher the pressure. Therefore, the collision of molecules with the container is directly related to the pressure of the gas.

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• 2.

### Boyle's Law states that at constant temperature, the pressure of gas is INVERSELY PROPORTIONAL to its volume.

• A.

True

• B.

False

A. True
Explanation
Boyle's Law describes the relationship between the pressure and volume of a gas at a constant temperature. According to the law, as the volume of a gas decreases, the pressure increases, and vice versa. This means that the pressure and volume are inversely proportional to each other. Therefore, the correct answer is true.

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• 3.

### What does the experiment tell us?

• A.

At constant volume, the pressure decreases as temperature increases.

• B.

At constant volume, the pressure increases as temperature increases.

• C.

As temperature increases, the volume and pressure increase too.

B. At constant volume, the pressure increases as temperature increases.
Explanation
This experiment tells us that when the volume is kept constant, the pressure of a gas increases as the temperature increases. This is because as the temperature rises, the gas molecules gain more kinetic energy and move faster, colliding with the walls of the container more frequently and with greater force. This increase in collisions leads to an increase in pressure.

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• 4.

### The balloon expands when heated and shrinks when cooled as presented in the diagram. Which gas law explains this?

• A.

Volume isinversely proportional to Pressure

• B.

Volume is directly proportional to Temperature

• C.

Pressure is directly proportional to Temperature

B. Volume is directly proportional to Temperature
Explanation
The correct answer is "Volume is directly proportional to Temperature." According to Charles's Law, the volume of a gas is directly proportional to its temperature, assuming constant pressure. This means that as the temperature increases, the volume of the gas expands, and as the temperature decreases, the volume of the gas shrinks. This is consistent with the behavior of the balloon in the diagram, as it expands when heated and shrinks when cooled.

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• 5.

### At constant temperature, the pressure of a gas is 200,000 Pa when its volume is 1 Liter. What becomes of its volume if the pressure decreases to 100,000 Pa?

• A.

0.5 Liter

• B.

1 Liter

• C.

2 Liters

• D.

4 Liters

C. 2 Liters
Explanation
When the pressure of a gas decreases, its volume increases, according to Boyle's Law. Boyle's Law states that at constant temperature, the pressure and volume of a gas are inversely proportional. In this case, the pressure decreases by half from 200,000 Pa to 100,000 Pa. Therefore, the volume of the gas will double from 1 Liter to 2 Liters.

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• 6.

### Check all the descriptions of an IDEAL GAS.

• A.

Molecules are spHerical and very small.

• B.

Molecules have attractive forces.

• C.

Molecules stick together when they collide.

• D.

Molecules are in rapid random motion.

A. Molecules are spHerical and very small.
D. Molecules are in rapid random motion.
Explanation
An ideal gas is characterized by its molecules being spherical and very small, which means they occupy negligible space compared to the volume of the gas. Additionally, the molecules of an ideal gas are in rapid random motion, meaning they move in all directions with high speed and collide with each other and the walls of the container. These two descriptions are consistent with the behavior of an ideal gas and distinguish it from other types of gases. The other descriptions, such as molecules having attractive forces or sticking together when they collide, are not applicable to an ideal gas.

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• 7.

### The image shows an extrapolated graph of volume and temperature in Celsius. The value -273 degrees Celsius is also called as _________________.

absolute zero
ABSOLUTE ZERO
Absolute zero
Absolute Zero
Explanation
The value -273 degrees Celsius is also known as absolute zero. Absolute zero is the lowest possible temperature, where all molecular motion ceases. It is the point at which all substances have their minimum possible energy.

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• 8.

### The room temperature is 25 degrees Celsius. In Kelvin scale, this is closest to ________.

• A.

258

• B.

262

• C.

273

• D.

298

D. 298
Explanation
The Kelvin scale starts at absolute zero, which is -273.15 degrees Celsius. To convert Celsius to Kelvin, you simply add 273. Therefore, 25 degrees Celsius is closest to 298 Kelvin.

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• 9.

### An ideal gas has an initial volume of 30 Liters at 500 Kelvin. What would be its new volume when the temperature is raised to 1500 Kelvin? Assume constant pressure.

• A.

10 Liters

• B.

30 Liters

• C.

90 Liters

• D.

150 Liters

C. 90 Liters
Explanation
When the temperature of an ideal gas is increased at constant pressure, the volume of the gas also increases. This relationship is described by Charles's Law, which states that the volume of an ideal gas is directly proportional to its temperature, assuming constant pressure. Therefore, if the initial volume of the gas is 30 Liters at 500 Kelvin, and the temperature is raised to 1500 Kelvin, the new volume of the gas would be 90 Liters.

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• 10.

### Which graph below shows the relationship between volume and pressure of gas at constant temperature?

• A.

Option

• B.

Option

• C.

Option

• D.

Option

A. Option
Explanation
The correct answer is option 4. This graph shows an inverse relationship between volume and pressure of gas at constant temperature. As the volume decreases, the pressure increases and vice versa. This is known as Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume when the temperature is held constant.

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• 11.

### Given the number of moles (N) and the gas constant (R), how is the ideal gas law written as an equation?

• A.

PT = NRT

• B.

PR = NVT

• C.

PV = NRT

• D.

PV = NR / T

C. PV = NRT
Explanation
The ideal gas law relates the pressure (P), volume (V), number of moles (N), and temperature (T) of a gas. The equation PV = NRT is derived from the ideal gas law, where P represents pressure, V represents volume, N represents the number of moles, R represents the gas constant, and T represents temperature. This equation states that the product of the pressure and volume of a gas is directly proportional to the number of moles, the gas constant, and the temperature.

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• Jun 25, 2023
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• Sep 20, 2015
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