Free Printable 3 IB Physics Topic 3 REview

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3 IB Physics Topic 3 REview

Total questions: 20

Worksheet time: 22mins

Name

Class

Date

Which statement about the pressure in a column of liquid is correct?

It acts only vertically downwards.

It increases if the column width increases.

It increases with depth in the column.

It is uniform throughout the column.

An airtight container holds a fixed quantity of gas. Its pressure and volume are measured on four occasions when the temperature is 20 °C. The results are shown in the table. Which set of readings is incorrect?

In a vacuum flask, which methods of heat transfer are prevented by the vacuum?

conduction only

convection only

conduction and convection only

conduction, convection, and radiation

A substance that is originally a solid is heated strongly for some time.
At one stage, the energy given to the substance is used as latent heat of vaporisation. At this stage, what change does the energy cause?

It breaks the bonds holding the molecules together. Molecules escape from the liquid.

It breaks the bonds holding the molecules together. The solid becomes liquid.

It makes the molecules move faster but there is still a strong attraction between them.

It makes the molecules move faster and so the temperature rises.

What happens when a metal bar is heated?

The distance between the molecules increases, making the bar longer.

The molecules get larger, making the bar longer.

The molecules vibrate more quickly, making the bar denser.

The speed of the molecules increases, making the bar thinner.

An ice-cube has a mass of 7.50 g. The ice-cube is at 0 °C. Heat from the surroundings reaches the ice-cube at an average rate of 1.25 J / s. How long does it take for all of the ice to melt? (specific latent heat of fusion of ice = 333 J / g)

35.5s

55.5s

2000s

3120s

An ice pack is used to cool 0.25 kg of water. The specific heat capacity of water is 4.2 kJ / (kg °C). How much thermal energy (heat) must the ice pack extract from the water to reduce the water temperature by 15 °C?

0.070kJ

1.1kJ

16kJ

250kJ

The graph shows how the temperature of a liquid varies with time when energy is supplied to the liquid at a constant rate P. The gradient of the graph is K and the liquid has a specific heat capacity c.

What is the mass of the liquid?

$\frac{P}{cK}$

$\frac{PK}{c}$

$\frac{Pc}{K}$

$\frac{cK}{P}$

A mass m of ice at a temperature of –5 °C is changed into water at a temperature of 50 °C.

Specific heat capacity of ice = c_i

Specific heat capacity of water = c_w

Specific latent heat of fusion of ice = L

Which expression gives the energy needed for this change to occur?

55 m c_w + m L

55 m c_i + 5 m L

5 m c_i + 50 m c_w + m L

5 m c_i + 50 m c_w + 5 m L

10.

A liquid is initially at its freezing point. Energy is removed at a uniform rate from the liquid until it freezes completely.

Which graph shows how the temperature T of the liquid varies with the energy Q removed from the liquid?

11.

Which of the following is equivalent to a temperature of –100°C?

–373 K

–173 K

173 K

373 K

12.

A sealed container contains water at 5 °C and ice at 0 °C. This system is thermally isolated from its surroundings. What happens to the total internal energy of the system?

It remains the same.

It decreases.

It increases until the ice melts and then remains the same.

It increases.

13.

A sealed cylinder of length l and cross-sectional area A contains N molecules of an ideal gas at kelvin temperature T.

What is the force acting on the area of the cylinder marked A due to the gas?

$\frac{NRT}{l}$

$\frac{NRT}{lA}$

$\frac{Nk_BT}{lA}$

$\frac{Nk_BT}{l}$

14.

A fixed mass of an ideal gas is trapped in a cylinder of constant volume and its temperature is varied. Which graph shows the variation of the pressure of the gas with temperature in degrees Celsius?

15.

A fixed mass of an ideal gas in a closed container with a movable piston initially occupies a volume V. The position of the piston is changed, so that the mean kinetic energy of the particles in the gas is doubled and the pressure remains constant.

What is the new volume of the gas?

$\frac{V}{4}$

$\frac{V}{2}$

$2V$

$4V$

16.

Under what conditions of density and pressure is a real gas best described by the equation of state for an ideal gas?

Low density and low pressure

Low density and high pressure

High density and low pressure

High density and high pressure

17.

Which of the following is not an assumption of the kinetic model of ideal gases?

All particles in the gas have the same mass.

All particles in the gas have the same speed.

The duration of collisions between particles is very short.

Collisions with the walls of the container are elastic.

18.

What is the definition of the mole?

The amount of substance that has the same mass as 6.02 × 10²³ atoms of carbon-12.

The amount of substance that contains as many nuclei as the number of nuclei in 12 g of carbon-12.

The amount of substance that has the same mass as one atom of carbon-12.

The amount of substance that contains as many elementary entities as the number of atoms in 12 g of carbon-12.

19.

The energy of the molecules of an ideal gas is

thermal only.

thermal and potential.

potential and kinetic.

kinetic only.

20.

A partially-inflated balloon is placed inside a bell jar. The bell jar is connected to an air pump. The air pump is switched on and air is removed from the bell jar.
What happens to the pressure and to the volume of the gas inside the balloon?

pressure decreases
volume decreases

pressure decreases
volume increases

pressure increases
volume decreases

pressure increases
volume increases

100 %

3 IB Physics Topic 3 REview

Total questions: 20

Worksheet time: 22mins

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