OCR GCSE Combined Science B (21st Century) Paper 4 November 2021 question paper

Which statements about waves are true and which are false ?

Tick (✓) one box in each row.

True False

Sundip is investigating the reflection of light off a plane mirror.

Sundip writes a series of steps for her investigation.

They are not in the correct order.

A Measure the angle of the incident ray.

B Measure the angle of the reflected ray.

C Repeat the measurements for different angles.

D Use a ray box to shine a light at the plane mirror.

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

The table shows Sundip’s results.

Sundip thinks one of her results is an outlier.

Complete the sentence to make Sundip’s conclusion correct.

The angle of the incident ray is approximately equal to / greater than / less than /

unrelated to the angle of the reflected ray.

Fig. 1.2 shows a pencil in a glass of water.

Complete each sentence about why the pencil looks broken in Fig. 1.2.

Use the words.

You can use each word once, more than once or not at all.

colour direction energy slows down speeds up

The pencil appears broken because the light changes........

when it moves from the air in the glass into the water.

The light........ as it enters the water.

Households in the UK are asked to separate recyclable materials such as metal cans, glass bottles and plastic containers from their waste.

Table 2.1 shows data about the recycling of these materials in the UK.

Which packaging material produces the highest amount of packaging waste?

Use data from Table 2.1.

Aluminium Glass Plastic Steel

Calculate the percentage of plastic recycled.

Use data from Table 2.1.

Give your answer to 1 decimal place.

The UK government has recycling targets.

Table 2.2 shows the percentage of aluminium, steel and glass recycled in the UK in 2017.

Which packaging material has the UK been most successful in recycling?

Use data from Table 2.2 to explain your answer.

Household waste for recycling is sent to a sorting centre. Steel contains iron.

Suggest how the sorting centre could separate the steel cans from the aluminium cans.

Producing glass from recycled materials uses less energy than producing glass from new resources.

Name two other factors that would be important when deciding that a product should be made from recycled materials instead of new resources.

Factor 1........

Factor 2........

Jack is interested in the effect of different types of exercise on his pulse rate.

Describe how Jack could investigate the effect of different types of exercise on his pulse rate.

Fig. 3.1 shows Jack’s pulse rate before, during and after some exercise.

Recovery rate is the time it takes for the pulse rate to return to the resting rate after exercise stops.

Calculate Jack’s recovery rate using Fig. 3.1.

Give your answer in minutes and seconds.

Recovery rate =........ minutes........ seconds

Jack concludes that the fitter a person is, the faster the recovery rate.

Do you agree with Jack’s conclusion?

Use Fig. 3.2 to explain your answer.

Suggest one way in which Jack could improve his investigation to increase confidence in his conclusion.

The graph shows the effect of weight on the incidence rate of heart failure, coronary heart disease and stroke per 1000 people.

Identify one trend shown by the data in the graph.

Health checks are carried out by the NHS when individuals turn 40. These health checks help health professionals to find out who is at greater risk of cardiovascular disease.

The table shows some of the questions asked at the health check and the answers provided by two patients.

Suggest which patient is at a higher risk of cardiovascular disease.

Use the table to support your answer.

Write down one additional question that the health professional could ask the patients to help assess their risk of cardiovascular disease.

Describe how Ling can use this equipment to observe the effect of forces on the extension of the spring.

Ling suggests five ways of improving the accuracy of her results.

Which two suggestions will increase the accuracy of her results?

Tick (✓) two boxes.

Attach a pointer to the bottom of the spring to help read the measurement on the metre rule.

The table shows Ling’s results.

Plot a graph, using the data in the table. One point has been done for you.

Draw a line of best fit.

Which statement describes the relationship between the force on the spring and the extension of the spring?

Tick (✓) one box.

The Amazon rainforest is an area of very high biodiversity.

The table shows data on four species groups found in the Amazon rainforest.

* Explain the effect of human activity on species found in the Amazon rainforest.

Use data in the table to support your answer.

Which two statements are benefits of maintaining biodiversity in the Amazon rainforest?

Tick (✓) two boxes.

Krypton is a Group 0 element.

Which two statements are properties of krypton?

Tick (✓) two boxes.

The table shows some properties of the Group 1 elements.

Complete the table by predicting the reaction of caesium with water, and the melting point of rubidium.

Potassium reacts with oxygen to form potassium oxide, K₂O.

Calculate the relative formula mass of potassium oxide.

Use the Data Sheet.

Which scientist developed the Periodic Table?

Tick (✓) one box.

Beth plans an investigation to help her estimate the population of buttercup plants in her garden.

This is part of Beth’s method:

1. Divide the garden into four equal sections.

2. Count the number of buttercup plants in the section that has the most buttercup plants.

3. Multiply the number of buttercup plants counted by four.

Describe how Beth could improve her method.

Beth thinks three factors are having an effect on the growth of buttercup plants in her garden.

Draw lines to connect each factor with the correct explanation of its effect on buttercup plants.

Factor
Explanation of its effect on buttercup plants

A group of students plot the estimated number of buttercup plants in their gardens.

The graph shows the students’ results.

How many gardens are sampled to produce the graph?

Kai estimates that he has 450 buttercup plants in his garden.

Which percentile of the students’ data does Kai’s estimation lie below?

25^th 50^th 75^th

Sea water is a solution of salts in water.

James has three sets of equipment. They are shown in Fig. 9.1.

Explain which set of equipment James should use to separate and collect water from sea water.

Include in your answer why the other sets of equipment are unsuitable.

Crude oil is a mixture of hydrocarbons. The mixture can be separated into fractions.

The table shows the number of carbon atoms in the hydrocarbon chains of three fractions of crude oil.

Fractional distillation is used to separate the different fractions of crude oil.

Explain why naphtha is collected above fuel oil in the fractionating tower.