OCR GCSE Combined Science A (Gateway) Physics Paper 12 Higher June 2022 question paper J250/12

This is a diagram of a transformer:

What is the current through the secondary coil?

Use the Data Sheet.

A 0.00132 A

B 125 A

C 211 A

D 758 A

A filament lamp has a resistance of 1000 and a current of 0.25 A.

What is the power of the filament lamp?

Use the equation: power = (current)² × resistance

A 62.5 W

B 250 W

C 4000 W

D 250 000 W

This is a picture of a longitudinal wave.

The wave is drawn to scale.

What is the wavelength of the wave?

A 0.5 cm

B 2.5 cm

C 5.0 cm

D 10 cm

The table shows information about the number of protons, neutrons and electrons in different

Which two atoms are isotopes?

A 1 and 2

B 1 and 3

C 2 and 3

D 3 and 4

The thinking distance of a car at 20 mph is 6 m. The braking distance of a car at 20 mph is 6 m.

What is the thinking distance and braking distance of the car at 40 mph?

The diagram shows a power station called a ‘combined heat and power’ (CHP) station.

Why is a CHP station is more efficient than a coal fired power station?

A Less energy is wasted in a CHP station.

B A CHP station produces renewable energy.

C The homes and offices contain insulation.

D There is more input of chemical energy in a CHP station.

Student A uses the electric hot plate in Fig. 11.1 to increase the temperature of water in a saucepan.

Fig. 11.1

Student A wants to calculate the thermal energy transferred to the saucepan of water.

These are the steps in their method:

1 Measure the volume of water with a balance. 2 Measure the starting temperature of the water with a thermometer. 3 Use the equation:

change in thermal energy = mass specific heat capacity change in temperature

Student A ’s method is incorrect.

Identify the two mistakes the student has made and write down the correction for each mistake.

Student A suggests wrapping insulation around the saucepan in Fig. 11.1.

Suggest another way student A can improve their experiment.

Student B uses the immersion heater in Fig. 11.2 to increase the temperature of water in a beaker.

Fig. 11.2

Describe an experiment to measure the energy transferred to the immersion heater, using the equipment in Fig. 11.2.

In your answer include:

• a method

• a circuit diagram

• an equation from the Data Sheet

• the symbol for a resistor to represent the immersion heater in your circuit.

This question is about radioactivity.

Which statements about the nucleus of an atom are correct? Tick (✓) two boxes.

The graph shows how the mass of a radioactive element changes with time.

Describe the trend shown by the graph.

A satellite receiver can be used to watch television channels. It works using a remote control.

Channel 4 uses a wave with a frequency of 1.0714 × 10¹⁰ Hz. (a)

The speed of the wave is 3.0 × 10⁸ m / s.

Calculate the wavelength of the wave.

Use the equation: wave speed = frequency × wavelength Give your answer to 3 decimal places.

The remote control emits infra-red or radio waves when a button is pressed.

The remote control also contains a light which flashes when a button is pressed.

Explain why the light is needed to show when a button is being pressed.

A student uses a smart meter to check their energy use at home.

The student thinks they can save energy by unplugging their satellite receiver from the mains supply for 8 hours at night.

Calculate the amount of energy saved by unplugging the receiver compared to switching the receiver off for 8 hours at night. Use the Data Sheet.

Give your answer in kWh.

The government wants all homes to have a smart meter by 2024.

Describe how smart meters may change the way energy resources are used. Use your answer to (c)(i).

A teacher uses a ripple tank to show refraction of water waves. Fig. 14.1 shows a ripple tank.

Fig. 14.1

Explain how the ripple tank and a thick sheet of plastic can be used to show refraction of water waves.

In 1986, a nuclear power station exploded in Chernobyl.

The radioactive isotopes caesium-137 (Cs-137) and iodine-131 (I-131) were released.

An old unit of activity is the Curie (Ci).

• The activity of Cs-137 released in the explosion was 2 300 000 Ci.

• 1 Ci = 37 000 000 000 Bq

Calculate the activity of Cs-137 released in Bq. Give your answer in standard form.

Cs-137 emits beta radiation. The table shows some information about this decay.

Use the table to complete the balanced nuclear equation for Cs-137 decay.

*(c) The isotopes I-131 and Cs-137 from Chernobyl contaminated sheep.

The government stopped the movement of contaminated sheep for 26 years.

• If the activity per kilogram of sheep was greater than 1000 Bq / kg, the sheep were contaminated.

• In 1986, the activity per kg of some sheep was greater than 1600 Bq / kg.

• I-131 emits beta radiation.

• Cs-137 emits beta and gamma radiation.

The graphs show how the amount of I-131 and Cs-137 change with time:

Graph for I-131

Graph for Cs-137

Use the graphs to explain why the government stopped the movement of contaminated sheep for 26 years.

Use ideas about half-life and half-life calculations.

A student drops a ball onto a hard floor. The mass of the ball is 0.06 kg.

The ball bounces once and the student catches the ball.

The graph shows how the velocity of the ball changes after it is dropped.

State a point on the graph where the gravitational store of the ball has a minimum value.

Choose from A, B, C, D or E.

State the point on the graph where the kinetic store of the ball has a maximum value.

Choose from A, B, C, D or E.

Calculate the kinetic energy of the ball at 0.4 seconds. Use the Data Sheet.

Calculate the potential energy of the ball at A.

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

Gravitational field strength = 10 N / kg.

The potential energy of the ball at E is 0.45 J.

Calculate the efficiency of the ball bounce. Use the Data Sheet and your answer to (c)(i).