OCR GCSE Combined Science B (21st Century) Paper 3 June 2022 question paper

Some waves are transverse waves and some are longitudinal waves.

Which of these waves are longitudinal waves?

Microwaves Ripples on water Sound waves X-rays

Complete the sentences about electromagnetic waves.

An example of an electromagnetic wave is electricity / light / sound.

Electromagnetic waves are emitted by all objects and the wavelengths emitted depend

on the mass / size / temperature of the object.

Give one other example of an electromagnetic wave.

The diagram shows a wave on a rope with measurements labelled A, B, C and D.

Which letter A, B, C, or D is the wavelength of the wave?........

Which letter A, B, C, or D is the amplitude of the wave?........

A sound wave from a violin has a frequency of 196 Hz and wavelength of 1.75 m in the air.

Calculate the speed of the sound wave in air.

Use the equation: wave speed = frequency × wavelength

Wave speed =........ m / s

Complete the diagram to show the energy transferred to the surroundings.

Calculate the efficiency of the microwave oven.

Give your answer as a percentage.

Jamal cannot switch the microwave oven on unless the door is closed. This is because the microwaves can damage body cells.

Why do microwaves damage body cells?

Tick (✓) one box.

This diagram shows a greyhound accelerating at the start of a race.

A greyhound has a mass of 30 kg and accelerates at 6.3 m / s². (a)

Calculate the force the greyhound uses to accelerate.

Use the Data Sheet.

The greyhound runs for 540 m in 30 s.

Calculate the average speed of the greyhound.

Use the Data Sheet.

Average speed =........ m / s

The scientific model of matter states that elements are made of atoms.

Complete the sentences to describe the nucleus of an atom.

All atoms have a positively charged nucleus because the nucleus contains

electrons / neutrons / protons.

The diameter of the nucleus is approximately 10^–5 m / 10^–15 m / 10^–100 m.

The scientific model of the atom has changed over time.

Draw lines, to connect the scientist to the description of the model they developed and the order in which it was developed.

Scientist
Description of model
Order

Describe how Bohr’s model of the atom is different to Rutherford’s model of the atom.

Which statements about atoms and electromagnetic radiation are true and which are false

Tick (✓) one box in each row.

True False

Kai has a model crane that is powered by a battery. The model crane is used to lift a box.

A constant current of 1.1 A flows through the battery when the crane is switched on.

Calculate the charge that flows through the battery in 2 minutes.

Use the equation: charge = current × time

Kai uses the crane to lift the box of 0.25 kg from the floor to a height of 0.84 m.

Calculate the gravitational potential energy gained by the box.

Use the equation: gravitational potential energy = mass × gravitational field strength × height

Gravitational field strength = 10 N / kg

The box is then dropped and falls back down to the floor.

How much kinetic energy does the box have just before it hits the floor?

Layla drives her car.

The speed of the car increases from 22 m / s to 28 m / s in 3 s. Use the Data Sheet. Calculate the acceleration of the car.

Acceleration........ m / s²

Complete the sentences to describe how energy is transferred as the car changes speed.

Use words from the list.

chemical elastic gravitational kinetic nuclear thermal

The car increases its speed when energy is transferred from the fuel’s

........ store, to the car’s........ store. Some energy

from the fuel will be wasted when energy is transferred to the........ store

of the car and its surroundings.

When the car brakes, energy is transferred from the car’s........ store to

the........ store of the brakes, raising their temperature.

Layla applies the brakes to stop the car.

The braking distance is the distance the car travels before it stops.

(d) Give two factors that affect the braking distance.

Layla makes an emergency stop. The braking force is 17 000 N and the car travels 75 m before it stops.

Calculate the work done by the brakes.

Use the equation: work done = force × distance

Give your answer to 2 significant figures.

Beth makes the circuit shown in the diagram using component X.

What is component X ?

Tick (✓) one box.

Suggest how Beth can change the circuit so that the potential difference across component X can be varied.

Beth changes her circuit and records the results shown in the table.

Calculate the resistance of component X when the current passing through it is 0.09 A.

Use the table and the equation: resistance = potential difference ÷ current

State the unit.

Ben is a food scientist. He melts some solid chocolate.

Describe what happens to the particles in the chocolate when it melts.

Ben places the chocolate in a fridge. The graph shows how the temperature of the chocolate changes as it cools.

What happens to the chocolate at 23 °C?

What is the change in temperature over the first 4 minutes?

The mass of the chocolate is 0.15 kg.

The specific heat capacity of chocolate is 1600 J / kg °C.

Calculate the change in the internal energy of the chocolate in the first 4 minutes.

Use the equation: change in internal energy = mass × specific heat capacity × change in temperature

Use your answer to (b)(ii).

When paper is placed between the radioactive source and the radiation detector the count rate is higher than when no material is used.

Some students try to explain this difference.

Which student’s explanation is correct?

The table shows if the materials absorb alpha, beta or gamma radiation.

Suggest which type, or types of radiation the source emits.

Use the table and Fig. 9.2 to explain your answer.

Carbon-14 is a radioactive source that can be used to find the age of some objects.

Fig. 9.3 shows the percentage of carbon-14 remaining in a sample, over time.

Use Fig. 9.3 to find the half-life of carbon-14.

Helium gas cylinders are used to fill helium balloons with gas.

The table shows the density and states of some materials at room temperature.

Compare the density of the materials in the table.

Use ideas about states of matter and data from the table in your answer.

Explain the differences between the densities of solids, liquids and gases.

Use ideas about particles in your answer.

On a hot day the temperature of the gas in the helium gas cylinder increases, but the volume of the cylinder does not change.

Complete the table to show what happens to the helium gas.

Tick (✓) one box in each row.

Which of these statements about the domestic electricity supply in the UK is true?

Tick (✓) one box.

Sundip installs panels made of material with low thermal conductivity to the walls of a house.

Describe how this will help to keep the house warm when it is cold outside.

Sundip buys electricity from a company that uses energy from renewable energy resources.

What is the difference between a renewable and non-renewable energy resource?

* The graph shows how some energy resources were used to generate electricity in the UK over 20 years.

Explain how the use of these three energy resources changed between 1998 and 2018.

This is Alex’s method. The sentences are not in the correct order.

A. Repeat the experiment for different angles of incidence. B. Shine a ray of light into the block. C. Place the glass block on some paper. D. Measure the angle of incidence and angle of refraction. E. Mark the path of the rays on the paper with a pencil. F. Draw a line to show the path of the ray inside the glass block. G. Remove the glass block and ray box.

Write the letters in the boxes to show the correct order of the method.

The first one has been done for you.

Suggest two ways in which Alex could improve his method to get more accurate measurements of the angles.

Alex records his results in the table.

Plot the results from the table on the graph. One point has already been plotted.

Draw a line of best fit.

Describe the relationship between the angle of incidence and the angle of refraction for the rectangular glass block in Alex’s investigation.