OCR GCSE Combined Science B (21st Century) Paper 7 June 2023 question paper

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.

Ben wants to compare the brightness of filament lamps connected in a parallel circuit.

He can use as many of the components shown as he needs.

Draw a circuit diagram using circuit symbols to show two filament lamps connected in a parallel circuit with a cell.

Describe how Ben can find out how the brightness of the filament lamps connected in parallel change as more lamps are added in parallel.

Suggest how Ben could find out how the current in a filament lamp affects the brightness of a filament lamp.

A neon lamp has a tube containing neon gas. Energy is transferred to the atoms of the gas. The atoms emit this energy as red light.

Which statement describes what happens to a neon atom when it emits red light?

Tick (✓) one box.

The lamp is connected to an electricity supply. The potential difference across the tube is 60 V.

Calculate the charge that flows through the tube when 7500 J of energy is transferred.

Use the Equation Sheet.

To supply the power to the neon lamp, a transformer uses a 240 V input power supply. The current in the primary coil is 0.2 A. The output potential difference is 60 V.

Calculate the current in the secondary coil of the transformer.

Use the Equation Sheet.

This table lists some data about an iodine radioactive isotope used to diagnose and treat cancer.

Complete the label, using data from the table.

The iodine is used as a tracer to image cancer cells. Gamma rays are emitted when the iodine decays.

Explain how the gamma rays can have hazardous effects.

Gamma rays can be emitted when radioactive nuclei decay.

State two other possible emissions from radioactive nuclei when they decay.

Why do radioactive nuclei decay?

Complete the sentences to describe what can change when the nucleus of an atom decays radioactively.

The charge of the nucleus can / cannot change, and the mass of the nucleus

can / cannot change.

In 2010 a new element was discovered. In 2015 the element was recognised officially. It is called tennessine.

Between 2010 and 2015 publications about tennessine went through the process of peer review.

Define peer review.

Fig. 6.1 shows that liquids separate. The liquid that settles at the bottom has the greatest density.

Mia has a sample of the syrup from Fig. 6.1.

She needs to determine the density of the syrup. She collects the equipment shown in Fig. 6.2.

Describe how Mia can use this equipment to accurately determine the density of the syrup.

Fig. 6.3 shows a small plastic block.

The mass of the block is 7.02 g.

Calculate the density of the block.

Density =........ g / cm³

Suggest why the block moves to this position.

An electric fan has a fast and slow setting.

On the slow setting the current is 50 mA.

Calculate the time for 30 C of charge to flow through the fan motor.

Use the Equation Sheet.

Define current.

On the fast setting the power transfer in the fan is 46 W. The current is 0.2 A.

Calculate the resistance of the fan.

Use the Equation Sheet.

On the slow setting the power rating is 11.5 W.

Calculate the energy transferred by the fan in 240 s.

The table shows the typical speed of some activities.

Complete the table.

Leo is riding his bike along a flat road.

It takes Leo 17 s to accelerate from 3 m / s to 7 m / s.

Calculate the acceleration of the bike.

Give your answer to 2 decimal places.

Use the Equation Sheet.

Acceleration =........ m / s²

Leo increases his speed by peddling harder. The bike accelerates because of forces between the wheel and the road.

Draw two arrows on the picture to represent the interaction pair of forces between the back wheel and the road.

Label the force on the road: X Label the force on the bike: Y

Later on in the journey, Leo travels at a constant speed.

Identify three forces acting on the bike.

Leo is carrying a heavy rucksack.

Which statement defines the weight of Leo’s rucksack?

Tick (✓) one box.

The weight of the rucksack is the downward force on the rucksack due to the gravitational attraction of the Earth.

The weight of the rucksack is the mass of the rucksack due to the downward force on the Earth.

The weight of the rucksack is the pressure on the rucksack due to the gravitational attraction of the Earth.

The weight of the rucksack is the pressure on the Earth due to the mass of the rucksack.

Hiro has a laser pointer which emits visible light.

The table shows the wavelength range for each colour in the visible light spectrum:

The frequency of the light from the laser pointer is 7.40 × 10¹⁴ Hz. (a)

Calculate the wavelength of the light.

Use the equation: wave speed = frequency × wavelength

The speed of light is 3.00 × 10⁸ m / s

Give your answer to 3 significant figures.

The manufacturer claims that the laser pointer emits violet light.

Is the manufacturer correct?

Explain your answer.

Which two statements about waves are correct?

Tick (✓) two boxes.

Gabi has a toy which uses a spring to fire a ball along a track as shown in Fig. 10.1.

Fig. 10.1

Gabi pulls back the plunger to compress the spring. When released, the spring sends the ball along the track to the top of the track at point Y.

The initial length of the spring is 0.17 m. It is compressed to a length of 0.05 m.

Calculate the energy stored in the spring when it is compressed.

Assume the energy stored when compressing the spring is the same as the energy stored when extending it the same distance.

Spring constant of the spring = 11 N / m Use the Equation Sheet.

The ball continues to the end of the track at point Z.

Assume that no energy is transferred to any thermal stores.

Complete this table to show the energy store that increases at each stage.

Describe what happens to the total energy of the ball as it moves from X to Z.

Explain how changing the compressed length of the spring affects the speed of the ball at point Z.

Explain how changing the height of the track at point Y affects the speed of the ball at point Z.

The height between X and Y is 0.35 m as shown in Fig. 10.2.

Fig. 10.2

Gabi pulls the plunger so that the energy stored in the spring is 0.06 J. The plunger is released.

Calculate the maximum height the ball can travel up the slope.

Mass of the ball = 0.02 kg Gravitational field strength = 10 N / kg

Use the Equation Sheet.