Particle Model of Matter questions

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Particle Model of Matter question collection

Review Particle Model of Matter questions for Physics, with correct answers shown and coverage across density and particle arrangement; internal energy; specific heat capacity and latent heat.

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Question 1

For a fixed mass of gas at constant temperature, which equation holds?
  1. \(pV = constant\)
  2. \(p/V = constant\)
  3. \(pT = constant\)
  4. \(V/T = constant\)

Question 2

A gas has pressure \(120\,\mathrm{kPa}\) at \(2\,\mathrm{m^3}\). If volume falls to \(1\,\mathrm{m^3}\) at the same temperature, what is the pressure?
  1. \(240\,\mathrm{kPa}\)
  2. \(60\,\mathrm{kPa}\)
  3. \(80\,\mathrm{kPa}\)
  4. \(120\,\mathrm{kPa}\)

Question 3

Which equation calculates the energy needed to raise temperature?
  1. \(\Delta E = mc\Delta \theta\)
  2. \(\Delta E = mL\)
  3. \(\Delta E = P + t\)
  4. \(\Delta E = \frac{mc}{\Delta \theta}\)

Question 4

How much energy is required to raise \(2\,\mathrm{kg}\) of copper (\(c = 390\,\mathrm{J/(kg\,^\circ C)}\)) by \(60\,\^\circ\mathrm{C}\)?
  1. \(46800\,\mathrm{J}\)
  2. \(4680\,\mathrm{J}\)
  3. \(78000\,\mathrm{J}\)
  4. \(23400\,\mathrm{J}\)

Question 5

Which equation gives the energy for a change of state?
  1. \(E = mL\)
  2. \(E = mc\Delta \theta\)
  3. \(E = Pt\)
  4. \(E = \frac{m}{L}\)

Question 6

How much energy is needed to vaporise \(0.5\,\mathrm{kg}\) of water if \(L_v = 2.3 \times 10^6\,\mathrm{J/kg}\)?
  1. \(1.15 \times 10^6\,\mathrm{J}\)
  2. \(1.15 \times 10^5\,\mathrm{J}\)
  3. \(4.6 \times 10^5\,\mathrm{J}\)
  4. \(2.3 \times 10^6\,\mathrm{J}\)

Question 7

What is specific latent heat of vaporisation?
  1. Energy per kilogram to change liquid to gas
  2. Energy per kilogram to change solid to liquid
  3. Energy per kilogram per degree of warming
  4. Energy released per second by a gas

Question 8

What makes up a substance's internal energy?
  1. Particle kinetic and potential energy
  2. Particle mass and electric charge
  3. Temperature and thermal conductivity
  4. Bulk movement and gravitational energy

Question 9

What makes most solids denser than their liquids?
  1. Closer particle packing
  2. Faster particle movement
  3. Larger particles
  4. Heavier particles

Question 10

How would you find the density of an irregular object?
  1. Measure mass and displacement volume
  2. Run current through it
  3. Weigh it in vacuum
  4. Measure its surface area

Question 11

Which equation defines density?
  1. \(\rho = \frac{m}{V}\)
  2. \(\rho = mV\)
  3. \(\rho = \frac{V}{m}\)
  4. \(\rho = m + V\)

Question 12

Why do visible smoke particles move randomly in air?
  1. Air molecules collide with them unevenly
  2. Gravity changes direction around them
  3. Their atoms repeatedly change mass
  4. Light waves push each particle equally

Question 13

A gas expands at constant temperature. What happens to its pressure?
  1. Decreases
  2. Increases
  3. Stays the same
  4. Becomes zero

Question 14

What happens when gas particles gain average kinetic energy?
  1. Their average speed increases
  2. Their average speed decreases
  3. Their average speed stays unchanged
  4. Their individual masses increase

Question 15

Convert \(20\,\mathrm{°C}\) to kelvin using \(K = \theta + 273\).
  1. \(293\,\mathrm{K}\)
  2. \(253\,\mathrm{K}\)
  3. \(20\,\mathrm{K}\)
  4. \(293\,\mathrm{°C}\)

Question 16

Which change of state is sublimation?
  1. Solid directly to gas
  2. Gas directly to solid
  3. Liquid to gas
  4. Solid to liquid

Question 17

What causes gas pressure on a container wall?
  1. Particle collisions transfer momentum to the wall
  2. Chemical bonds pull continuously on the wall
  3. Sound waves add particles to the container
  4. Particles lose mass whenever they hit the wall

Question 18

At constant temperature, what happens to gas pressure when its volume is halved?
  1. The pressure doubles
  2. The pressure halves
  3. The pressure stays the same
  4. The pressure becomes zero

Question 19

Which temperature scale must be used in gas-law equations?
  1. Kelvin
  2. Celsius
  3. Fahrenheit
  4. Degrees per second

Question 20

Why does air warm when compressed in a bicycle pump?
  1. Work transfers energy to the air
  2. Air loses internal energy
  3. Particles lose kinetic energy
  4. Air changes into a liquid

Question 21

Which measurement technique gives the precise volume of an irregular solid?
  1. Measuring the water it displaces
  2. Weighing it on a balance
  3. Measuring its longest side with a ruler
  4. Taking its temperature with a thermometer

Question 22

How does evaporation differ from boiling?
  1. It occurs at the surface below boiling point
  2. It occurs throughout the liquid at boiling point
  3. It changes gas directly into liquid
  4. It raises every particle to the same speed

Question 23

An object has mass 180 g and volume 60 cm³. What is its density in g/cm³?
  1. 3
  2. 0.33
  3. 120
  4. 10800

Question 24

What does a flat section on a heating graph usually show?
  1. A change of state
  2. A constant heating power
  3. A falling internal energy
  4. A decreasing particle number

Question 25

What is specific latent heat of fusion?
  1. Energy per kilogram to change solid to liquid
  2. Energy per kilogram to change liquid to gas
  3. Energy per kilogram per degree of warming
  4. Energy released per second by a solid

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Review Particle Model of Matter questions for Physics, with correct answers shown and coverage across density and particle arrangement; internal energy; specific heat capacity and latent heat.

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