OCR GCSE Combined Science A (Gateway) Physics Paper 12 Higher June 2018 question paper J250/12

A car travels at 10 m / s. The mass of the car is 800 kg.

Use the equation: Kinetic energy = 0.5 × Mass × Speed²

Calculate the kinetic energy of the car.

A 4000 J

B 8000 J

C 40 000 J

D 80 000 J

This is a model of energy levels inside an atom.

Which electron movement emits radiation with the highest energy?

Which sentence describes a renewable energy source?

A An energy source that can be replaced in your lifetime.

B An energy source that cannot be used again and again.

C An energy source that is not made from fossil fuels.

D An energy source that will run out.

In the UK, three wires are used in the domestic electricity supply.

They are the earth wire, the live wire and the neutral wire.

Which sentence is correct?

A The alternating p.d. between the neutral wire and the earth wire is 230 V.

B The alternating p.d. between the neutral wire and the live wire is 230 V.

C The earth wire contains a fuse for safety.

D The live wire is connected to the case of an appliance for safety.

A student makes some estimates about distance and time.

• 1 mile is about 1500 metres.

• 1 hour is about 3500 seconds.

The student uses this information to convert 30 mph to m / s.

Which answer is correct?

A 0.013 m / s

B 13 m / s

C 70 m / s

D 70 000 m / s

A driver stops a moving car by pressing the brakes. The engine is turned off and the driver gets out of the car. The driver returns to the car after 30 minutes.

Which sentence is correct?

A The energy in the thermal store of the brakes increases.

B The energy in the thermal store of the driver increases.

C The energy in the thermal store of the surroundings increases.

D The energy in the thermal store of the tyres increases.

How are radio waves produced?

A By alternating currents

B By a radio

C By a speaker

D By steady currents

Look at the velocity-time graph for a car.

Which graph shows the correct distance-time graph for this car?

A teacher adds 200 cm³ of warm water to a beaker. 10

He wraps the beaker in insulation. He measures the temperature drop after 10 minutes.

The table shows the results of four different experiments A, B, C and D.

Which experiment gives the lowest rate of cooling?

The graph shows how the height of a water wave changes with distance.

The water wave has a wavelength of 6 m.

Describe how the graph shows this.

The frequency of the water wave is 0.5 Hz.

Calculate the speed of this water wave.

Answer =........ m / s

A group of students use a ripple tank, a metre ruler and a stopwatch.

They draw a diagram of this equipment.

Explain how this equipment is used to measure the frequency of water waves.

A student measures the extension of a spring when it is stretched.

He hangs different cubes from the spring. He measures the extension of the spring for each cube.

Look at his results.

Plot a graph of the results on the grid.

Use the results and the graph to show the spring constant is 35 N / m.

The spring constant is 35 N / m.

Calculate the energy transferred to this spring when the extension is 0.2 m.

13* Person A and person B drive their cars along the same road on different days.

Both cars travel at 25 m / s. The traffic lights along the road change to red.

Person A and person B see the red light and press the brakes in their car.

The graphs show the velocity of each car after person A and person B see the red light.

The graphs are drawn using the same scale.

Explain what the graphs show you about how the cars stop.

Use values from the graphs and calculations in your answer.

This question is about nuclear radiation.

Q and R are different radioactive isotopes. Q has a different half-life to R.

Explain what is meant by the term half-life.

The graph shows how activity of isotope Q and isotope R change with time.

Which isotope, Q or R, has the longest half-life? Explain your answer.

The table shows information about different elements.

Iodine-131 is a radioactive isotope. Iodine-131 decays, emitting a beta () particle.

Write a balanced nuclear equation for iodine-131 decay. The first part is done for you.

The table shows how the activity of iodine-131 decreases with time.

Use your answer to (c)(i) to calculate the half-life of iodine-131.

The table shows some information about electrical appliances in the home.

Appliance	Power (W)	Current (A)	Resistance ()
Electric drill	800	3.48	66.1
Iron	2000	8.69	26.5
Kettle	2500	10.86	21.1
Security light	500	2.17	105.8
Toaster	1650	7.17	32.1

Use the table to describe the relationship between power and resistance.

Explain this relationship. Use ideas about resistance in your answer.

The security light is switched on for 45 minutes every day for 7 days.

Use the equation: Energy transferred = Power × Time

Calculate the energy transferred in kWh.

Give your answer to 2 significant figures.

Explain the difference between direct voltage and alternating voltage.

The electric drill does not need an earth wire.

Explain why.

Mains electricity can be produced in a power station that burns coal.

An electric iron is plugged into the mains and switched on. The temperature of the iron increases.

Describe this process.

Use ideas about energy stores in your answer.

A scientist completes an experiment to determine the specific heat capacity of water.

She uses an immersion heater to increase the temperature of water in a beaker.

Suggest two ways to ensure the scientist obtains accurate results.

The scientist measures the temperature of the water every 60 seconds.

She plots her results.

Is there a random error in this experiment?

Explain your answer.

The scientist thinks the point labelled B on the graph is an anomaly.

Is she correct? Explain your answer.

Calculate the gradient (slope) of the graph.

Answer =........ °C / s

The scientist writes down more results.

• 0.1 kg of water used

• Power of immersion heater = 12.8 W

Use the equations:

Energy transferred = Power × Time

Change in thermal energy = Mass × Specific heat capacity × Change in temperature

Calculate the specific heat capacity of water.

Use the results and the gradient you calculated in part (c)(i).

Answer =........ J / kg °C