oxford cambridge and rsa gcse (9–1) combined science a ... · gcse (9–1) combined science a...

Turn over© OCR 2017 Practice paperDC (NF/SG) 153075/2

Oxford Cambridge and RSA

GCSE (9–1) Combined Science A(Gateway Science)J250/05/11 PhysicsFoundation and Higher Tier

Year 10 TestTime allowed: 1 hour 10 minutes

You must have:• a ruler (cm/mm)• the Data Sheet

You may use:• a scientific or graphical calculator

OCR is an exempt Charity

INSTRUCTIONS• Use black ink. You may use an HB pencil for graphs and diagrams.• Complete the boxes above with your name, centre number and candidate number.• Answer all the questions.• Write your answer to each question in the space provided.• Additional paper may be used if necessary but you must clearly show your candidate

number, centre number and question number(s).• Do not write in the barcodes.

INFORMATION• The total mark for this paper is 60.• The marks for each question are shown in brackets [ ].• Quality of extended responses will be assessed in the questions marked with an

asterisk (*).• This document consists of 24 pages.

Last name

First name

Candidatenumber

Centrenumber

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J250/05© OCR 2017 Practice paper

SECTION A – FoundationAnswer all the questions.

1 Which of the following is the acceleration of free fall on Earth?

A 1 m/s2

B 10 m/s2

C 98 m/s2

D 100 m/s2

Your answer [1]

2 A student investigates static electricity.

She brings differently charged rods towards differently charged gold leaf electroscopes.

+

+

P

+

−

Q

−

+

R

−

−

S

Which of the situations for P, Q, R and S will cause the gold leaf in the electroscope to rise higher?

A P only

B R only

C P and S

D Q and R

Your answer [1]

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J250/05 Turn over© OCR 2017 Practice paper

3 Which of the following appliances transfers the most energy?

Use the formula: energy transferred = power × time

Appliance Power (W) Time used (h)

A 3000 0.5

B 2000 0.5

C 100 2.0

D 2000 1.0

Your answer [1]

4 A student investigates changes of state as materials cool.

Which phase change occurs during cooling a material?

A Condensing

B Evaporating

C Melting

D Sublimating

Your answer [1]

5 A current of 5 A is turned on for 60 seconds.

How much charge flows?

A 5 C

B 30 C

C 50 C

D 300 C

Your answer [1]

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SECTION B – Foundation

6 A student sets up a circuit to investigate the current-voltage characteristic for an unknown component.

The student has set up the circuit incorrectly.

A

V

unknowncomponent

(a) (i) Identify the two errors in the circuit.

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(ii) Describe how to correct one of these errors.

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(b) The student corrects the circuit.

He then uses the circuit to collect some results.

Look at the table.

Potential difference (V) Current (A)

–1.5 0.00

–1.0 0.00

–0.5 0.00

0.0 0.00

0.5 0.00

1.0 0.15

1.5 0.55

(i) State what happens to the current as the potential difference increases.

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(ii) What is the unknown component?

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(iii) Draw a sketch graph of the student’s results.

current

voltage

[2]

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(iv) Calculate the resistance of the component at 1.0 V and 1.5 V.

Use the formula: resistance = potential difference ÷ current

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resistance at 1.0 V ......................................... Ω

resistance at 1.5 V ......................................... Ω [2]

(v) What can you conclude about the resistance of this component?

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7 A student places a heater inside a glass funnel.

She puts ice into the funnel and a beaker is placed below to collect the melted ice.

She turns on the heater and measures the mass of the melted ice after a set time.

heater

ice

funnel

beaker

water

(a) (i) Calculate the energy needed to change 0.10 kg of ice into water.

The specific latent heat of ice to water is 34 000 J/kg.

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answer: .................................. J [2]

(ii) The actual energy used is different to the answer in 7(a)(i).

Suggest two improvements to the student’s experimental procedure.

1 ........................................................................................................................................

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2 ........................................................................................................................................

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(b) The student now increases the temperature of the 0.10 kg of water from 0 °C to 20 °C.

Calculate the energy needed for this temperature change.

Use the formula: change in thermal energy = mass × specific heat capacity × change in temperature

The specific heat capacity of water is 4200 J/kg/°C.

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answer: ................................ J [2]

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8 The graph shows how two different materials, A and B, extend when under a force.

6

5

4

3

2

1

00 0.01 0.02 0.03 0.04 0.05 0.06 0.07

force (N)

extension (m)

A

B

11


(a)* Compare the behaviour of the two materials and explain how the data in the graph shows this. Use calculations from the graph in your answer.

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(b) (i) The force in this experiment is caused by the gravitational field of the Earth.

State two of the properties that affect the strength of a gravitational field.

1 ........................................................................................................................................

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2 ........................................................................................................................................

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...........................................................................................................................................[2]

(ii) Describe the relationship between the weight of an object and the gravitational field strength, g.

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SECTION C – Higher

Answer all the questions.

9 Which of the following is a typical size for an atom?

A 0.1 cm

B 0.1 mm

C 0.1 µm

D 0.1 nm

Your answer [1]

10 Which of the following statements is not true for the plum-pudding model of the atom?

A Negative electrons are embedded throughout the plum-pudding.

B Raisins represent charges around the outside of the plum-pudding.

C The pudding itself is a mass of positive charge.

D The plum-pudding model was developed by J.J. Thomson.

Your answer [1]

11 Four different wires are placed at right angles to identical magnetic fields.

Wire Length of wire (m) Current in wire (A)

A 0.4 3.0

B 0.3 5.0

C 0.2 7.0

D 0.1 9.0

Which wire experiences the largest force?

Your answer [1]

14


12 A rocket of mass 2.0 × 105 kg travels at a velocity of 2500 m/s.

What is the momentum of the rocket?

Use the formula: momentum = mass × velocity

A 0.8 × 103 kg m/s

B 5.0 × 105 kg m/s

C 5.0 × 108 kg m/s

D 0.8 × 1011 kg m/s

Your answer [1]

13 A student uses two bar magnets to investigate magnetic field lines.

Which pattern shows a correct pattern of magnetic field lines?

S N N S

A

S N S N

B

N S S N

C

N S N S

D

Your answer [1]

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SECTION D – Higher

14 A student records the velocity of a toy boat for a period of 50 seconds.

Look at the table of his results.

Time (s) Velocity (m/s)

0 10.0

10 10.0

20 7.5

30 5.0

40 2.5

50 0.0

(a) Plot the missing data points on the graph below and draw a line of best fit. [2]

0 10 20 30 40 50

10.0

8.0

6.0

4.0

2.0

0.0

velocity(m/s)

time (seconds)

17


(b) Use the graph to calculate the distance travelled by the boat during this 50 second period.

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answer: ......................... m [3]

(c) Calculate the deceleration of the boat between 10 seconds and 50 seconds.

Give the units in your answer.

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answer: ......................... units ............... [3]

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15* A student has a hypothesis. She thinks that the resistance of an LDR depends on its distance from a light source.

Describe and explain a suitable experimental procedure that the student could use to investigate this hypothesis accurately. Explain how she will process her results.

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16 Nick runs up a staircase of 20 steps in 30 seconds.

He weighs 500 N and each step is 20 cm high.

(a) Calculate the work done by Nick.

Use the formula: work done = force × distance

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answer: ................................ J [2]

(b) Calculate the power exerted by Nick.

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answer: ................................ W [3]

(c) Steve is twice the weight of Nick.

Suggest the time that Steve would need to run up the staircase to exert the same power as Nick.

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17 A student drops a ball bearing into a measuring cylinder containing vegetable oil.

ball

vegetable oil A

B

C

The student uses a stop-clock to time how long it takes for the ball bearing to fall in each of the three sections (A–C) of the cylinder.

Look at the results.

AttemptTime taken to fall through section (s) Total time of

fall (s)A B C

1 2.1 1.5 1.4 5.0

2 1.9 1.5 1.5 4.9

3 1.7 1.6 1.6 4.9

Mean 1.9 1.5

(a) Calculate the mean time taken for section C. [1]

(b) Describe the results and what the student could conclude from these.

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(c) The main source of error in this experiment was measuring the time taken for the ball bearing to fall through each section.

Suggest how this part of the experimental procedure could be improved.

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Oxford Cambridge and RSA

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