OCR GCSE Combined Science B (21st Century) Paper 3 June 2023 question paper

Ling has a torch with a filament lamp.

What is the correct circuit symbol for a filament lamp?

The torch is not working. Ling makes this circuit to test components.

Complete the sentences to explain how the circuit works.

A component is connected to A and B using the ammeter / battery / crocodile clips.

If the ammeter measures a current it means that the circuit is broken / complete / faulty

This shows that the component conducts electricity / heat / light.

Which equation shows how to calculate the energy transferred to the filament lamp?

Tick (✓) one box.

The current through the filament lamp is 0.5 A.

Calculate the charge that flows through the lamp in 30 s.

Use the equation: charge = current × time

Jack has a kidney scan. A radioactive tracer called technetium-99m is used in the scan.

A gamma camera uses the radiation emitted by a radioactive tracer to form an image.

The statements describe how a kidney is scanned by a gamma camera. They are not in the correct order.

A This causes gamma rays to be emitted from the kidney.

B There is radioactive decay of the tracer in the kidney.

C The radioactive tracer is injected into Jack’s blood.

D The gamma rays are detected by the gamma camera.

E The tracer travels around the body and collects in the kidney.

Write the letters in the boxes to show the correct order of how a kidney is scanned.

The first one has been done for you.

Radioactive materials emit ionising radiation.

Explain how ionising radiation can affect living things.

Using a radioactive source can result in contamination or irradiation.

Which statement is an example of contamination?

Tick (✓) one box.

Kai reads about an insect that has a large acceleration.

The speed of the insect increases from 0 m / s to 0.9 m / s in a time of 0.006 s.

Calculate the acceleration of the insect.

Acceleration =........ m / s²

The insect has a very small mass.

Kai investigates how changing the force on an object affects the acceleration of the object.

Complete the sentences to explain how Kai does the experiment.

Kai adds a 100 g mass to the bench / mass hanger / trolley.

He releases the trolley and it travels along the runway.

The light gates detect the card / trolley / mass hanger.

Kai repeats the experiment adding another 100 g mass / trolley / light gate each time.

The data logger calculates the acceleration of the trolley.

What data does the data logger use to calculate the acceleration of the trolley?

The force accelerating the trolley is the weight of the mass hanger.

Calculate the weight of the mass hanger when its mass is 0.4 kg.

Use the equation: weight = mass × gravitational field strength

Gravitational field strength = 10 N / kg

Alex uses some filament lamps to light the rooms of a model house.

Alex connects one filament lamp to a battery. The lamp has a resistance of 10 and the current through it is 0.3 A.

Calculate the potential difference across the lamp.

Use the equation: potential difference = current × resistance

Calculate the power transferred in the lamp.

Use the Equation Sheet.

Resistance of lamp = 10 Current through lamp = 0.3 A

Alex learns about connecting resistors in series and parallel.

Alex builds a circuit with one fixed resistor, as shown in Fig. 4.1.

Alex then adds a second resistor in series as shown in Fig. 4.2.

Fig. 4.1
Fig. 4.2

Complete the sentences to explain the increase in total resistance of the circuit when a second resistor is added in series.

The reading of the current on the ammeter increases / decreases because it has to pass through both resistors.

The reading of the potential difference on the voltmeter stays the same / increases

Alex rebuilds his original circuit (Fig. 4.1). Alex then adds a second resistor in parallel as shown in Fig. 4.3.

Fig. 4.1
Fig. 4.3

Complete the sentences to explain the decrease in total resistance of the circuit when a second resistor is added in parallel.

The current passes through both branches of the circuit, so the reading on the ammeter decreases / increases / stays the same.

The potential difference reading on the voltmeter decreases / increases / stays the same.

The diagram shows a spring key ring which can be stretched.

The stretching forces deform the spring. The deformation can be plastic or elastic.

Complete the sentences to describe the difference between plastic deformation and elastic deformation.

Plastic deformation:

When the force is removed........

Elastic deformation:

When the force is removed........

A force of 9 N is used to stretch the spring.

Calculate the extension of the spring.

The spring constant = 2.5 N / cm

Beth investigates the change in stored energy when an electrical appliance is used.

Her results are shown in the table.

Explain how the power rating, and the time the appliance is used for, affects the change in stored energy.

Use data from the table.

Beth wants her home to be warm.

How can Beth reduce the energy losses from her home?

Ben is heating some soup on a gas hob.

Describe what happens to the liquid soup as its temperature increases.

Use ideas from the particle model.

When energy is transferred to the soup, the internal energy of the soup increases.

Calculate the energy transferred to the soup when the temperature is increased from 20 °C to 90 °C.

The mass of the soup is 400 g The specific heat capacity of the soup is 4100 J / kg °C

Use the Equation Sheet.

A car is pulling a trailer. The diagram shows some of the forces on the car and the trailer.

Newton’s 3rd Law describes interaction pairs of forces.

Which two forces in the diagram form an interaction pair?

State two reasons why these forces are an interaction pair.

The car and trailer are travelling at a speed of 12 m / s.

Calculate the kinetic energy of the car and trailer.

The mass of the car is 1100 kg and the mass of the trailer is 300 kg. Use the equation: kinetic energy = × mass × (speed)²

Eve drops a pebble into a pond.

Fig. 9.1 shows how the water waves spread out.

The graph shows a transverse wave.

Label an amplitude with a letter A, and a wavelength with a letter W on the transverse

What is the frequency of the wave?

Tick (✓) one box.

A water wave has a wavelength of 0.3 cm and a frequency of 100 Hz.

Calculate the wave speed of the water wave.

Use the equation: wave speed = frequency × wavelength

Give your answer in m / s.

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

Complete the sentences to describe how Eve can use the ripple tank to measure the wavelength of a water wave.

Use words from the list.

distance mass ruler speed stopwatch time

Make the waves low frequency waves by changing the........ of the motor.

To measure the wavelength of the waves, place a........ on the paper.

Measure the........ between the waves to get the wavelength.

How can Eve get a stationary image of the waves on the paper?

The wavelength is very small.

How can Eve get a more accurate measurement of the wavelength?

How can Eve reduce the uncertainty of her result?

Tick (✓) one box.

Eve wants to investigate circular waves with the ripple tank. Dropping a pebble into the ripple tank does not continually produce circular waves.

Suggest how she can continually produce circular waves in the ripple tank.

When trains were invented, people were able to travel between places at 7 m / s. This is faster than the typical walking speed.

What is a typical walking speed for an adult human?

Walking speed =........ m / s

What is the difference between speed and velocity?

The table and the graph show a train journey.

Plot the results for point E and point F on the graph.

Draw lines to complete the distance–time graph.

Calculate the speed of the train between points B and C.

Speed of train between points B and C =........ km / h

Describe how the speed of the train changes from point A to point D.

A stationary train accelerates steadily from an initial speed of 0 m / s to a final speed of 56 m / s.

Calculate the distance the train travels as it is accelerating.

The acceleration is 0.2 m / s².

Give your answer to 2 significant figures.

Use the Equation Sheet.

In a collision a train comes to a stop quickly. This is a very large deceleration.

Explain why this is dangerous for the passengers.

In your answer, use the equation: force = mass × acceleration

Which two statements about electromagnetic radiation are true?

Tick (✓) two boxes.

Complete the table by showing the main groups of the electromagnetic spectrum from long to short wavelengths.

Use words from the list.

Gamma rays Microwave Radio Visible X-rays Ultraviolet

Complete the sentence about electromagnetic radiation.

When the wavelength of electromagnetic radiation gets shorter

the frequency increases / decreases / stays the same

and the energy increases / decreases / stays the same.

A new telescope in space called the JWST uses electromagnetic radiation to produce images of very distant galaxies.

Suggest one benefit of seeing images of very distant galaxies.

Suggest one reason why scientists looking at images from the JWST should tell everyone about their discoveries.

The UK uses a number of different energy resources including wind and nuclear fuel to generate electricity.

Give one other example of a renewable energy resource and a non-renewable energy resource.

* Nuclear fuel and wind are used to generate electricity in the UK.

The graph shows the energy transferred to generate electricity from these resources between 2016 and 2020.

Describe how nuclear fuel and wind are used to generate electricity.

Include in your answer how the use of these energy resources has changed in the UK since 2016.

This map shows wind farm sites in the UK in 2021.

Wind turbines can be built on land or in the sea.

Suggest two reasons why some land areas may not be suitable for wind turbines.