Combined Science A (Gateway) · OCR J250 · Physics Paper 11 · Higher · June 2018
Four compasses are each placed near to a wire at points A, B, C and D. Each wire has a current flowing through it. The distance of each compass from its wire is shown.
Which compass experiences the greatest magnetic field strength?
[1]
Which of the following is a definition for specific heat capacity in physics?
A Energy needed to increase the temperature of 1 g of material by 1 °C.
B Energy needed to increase the temperature of 1 kg of material by 1 °C.
C Energy needed to increase the temperature of 1 g of material by 10 °C.
D Energy needed to increase the temperature of 1 kg of material by 10 °C.
[1]
A student wishes to draw a diagram of a circuit she has created.
Which diagram A, B, C or D shows the circuit symbol for a variable resistor?
[1]
Which of the following forces is a non-contact force?
A Drag
B Electrostatic
C Tension
D Upthrust
[1]
In which circuit would a current flow?
[1]
Which of the following is the same speed as 7.2 km / h?
A 2.0 m / s
B 20.0 m / s
C 25.9 m / s
D 120.0 m / s
[1]
Look at the graph below.
Which of the following is the distance travelled between 0 and 6 seconds?
A 22.5 m
B 45.0 m
C 67.5 m
D 90.0 m
[1]
How can mass be calculated?
A Acceleration divided by force
B Force divided by acceleration
C Gravity divided by weight
D Weight divided by force
[1]
A student lifts four different objects onto a set of shelves.
| Object | Mass (kg) | Height lifted (m) |
| A | 0.1 | 2.2 |
| B | 0.3 | 1.5 |
| C | 0.4 | 1.7 |
| D | 0.5 | 2.0 |
Which object gains the most gravitational potential energy?
[1]
A student uses a small motor to lift a toy car through a vertical distance of 1.0 m.
The car has a weight of 0.05 N.
Calculate the work done when lifting the car through this distance.
[3]
Calculate the power of the motor if the car takes 5.0 seconds to travel the 1.0 m distance.
State the unit.
[4]
The motor uses 2 cells in series.
Each cell has a potential difference of 1.5 V.
Write down the total potential difference of the cells.
[1]
The motor has a resistance of 6.0 
.
Calculate the current in the circuit when the motor is in use.
Use the equation: Potential difference = Current × Resistance
[3]
The student wishes to increase the time taken to lift this toy car vertically through the 1.0 m distance shown.
Suggest a change he could make to this experiment to achieve this.
[1]
A teacher demonstrates static electricity using a Van de Graaff generator.
She places 3 metal foil containers on top of the dome of the Van de Graaff generator. When the Van de Graaff generator is turned on, the foil containers fly off the dome one by one.
Explain why this happens.
Use ideas about charge in your answer.
[4]
Calculate how long it would take for a charge of 5.0 C to flow with a current of 25 mA.
Use the equation: Charge flow = Current × Time
[4]
13* A student removes a material from a freezer and heats it up.
He uses a heater with a constant power output. He then plots a heating curve of the material as its temperature rises.
Describe and explain what the graph tells us about the material being heated.
[6]
Objects in freefall eventually reach terminal velocity.
Draw a labelled diagram to show the forces acting on an object when it is falling at terminal velocity.
[3]
A student measures two forces.
The forces are 5.0 N and 3.0 N. The forces act at 90° to each other.
Draw a scale drawing to determine the resultant force.
[3]
An object travelling in a circle at a constant speed has a changing velocity.
State why.
[1]
Fleming’s left-hand rule is used to show the direction of the force produced when a current flows in a magnetic field.
Explain how.
[3]
A simple motor is shown in the diagram.
Use the diagram to explain how rotation is caused in the motor.
[3]
Calculate the magnetic flux density on a 0.5 m long conductor when a current of 0.8 A flows.
The force produced is 0.6 N.
[3]
Two students investigate how the resistance of a thermistor varies with temperature.
The students place the thermistor in a beaker of water and measure the resistance of the thermistor for 5 different temperatures. They repeat the experiment three times at each temperature in order to calculate a mean.
| Temperature | Resistance ( |  ) | ||
| (°C) | 1 | 2 | 3 | Mean |
| 10 | 1900 | 1870 | 1930 | 1900 |
| 15 | 980 | 1000 | 990 | 990 |
| 20 | 770 | 760 | 760 | 763.3 |
| 25 | 610 | 720 | 610 | 647 |
| 30 | 540 | 540 | 530 | 536 |
Describe the pattern shown by these results.
[2]
The students have made mistakes when recording their results.
Identify two mistakes and explain what they should have done.
[2]
Suggest one way the experiment could be improved.
[1]
At 10 °C the thermistor had a resistance of 1900 
. The thermistor has a power rating of 75 × 10–3 W.
Calculate the maximum current in this thermistor at 10 °C.
Use the equation: Power = Current2 × Resistance
[3]
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