Practical skills (OCR GCSE Physics A (Gateway)): Exam Questions

Exam code: J249

1 hour16 questions
11 mark

A student experiments with a model parachute and collects some results.

She drops the parachute from a height of 4 m three times and takes three results of the time taken.

The three results are:

3.25 s

3.00 s

3.08 s

What is the mean of the three results?

  • 3.00 s

  • 3.08 s

  • 3.11 s

  • 3.25 s

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21 mark

A student wants to find out which heater produces the largest temperature rise.

Look at the results she collects and the calculations she makes.

Heater

Starting temperature (°C)

Finishing temperature (°C)

Change in temperature (°C)

A

18

28

20

B

18

36

16

C

18

44

26

D

18

51

23

Which heater has results that are correctly calculated?

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    31 mark

    A student measures the time it takes for a bicycle to stop in an emergency.

    She repeats the measurement to get three results.

    The average time for her results is 2.72s .

    The first two results are 2.66 s and 2.60 s.

    What is the value of her third result?

    • 2.63 s

    • 2.66 s

    • 2.72 s

    • 2.90 s

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    41 mark

    Four students measure the time it takes for a wave to travel the length of a ripple tank.

    Each student collects three measurements of the time.

    Student

    Time taken (s)

    1st measurement

    2nd measurement

    3rd measurement

    A

    2

    2

    1

    B

    2.1

    2.1

    2.4

    C

    2.1

    2.0

    2.2

    D

    2.11

    2.49

    2.23

    Which student collected the most precise data?

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      51 mark

      A student measures the time it takes for the sound from a firework to reach the observer.

      She takes 3 measurements of the time taken for four different distances, A, B, C and D.

      Distance

      Time taken (s)

      1st measurement

      2nd measurement

      3rd measurement

      A

      2.16

      2.19

      2.17

      B

      1.99

      2.02

      1.97

      C

      1.80

      1.81

      1.89

      D

      1.69

      1.68

      1.71

      Which distance A, B, C or D, has the largest range of values?

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        6
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        1 mark

        Which variables are to be identified in designing an experiment:

        • Independent variable and dependent variable

        • Dependent variable and control variable

        • Control variable and independent variable

        • Independent variable, dependent variable and control variable

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        7
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        1 mark

        When investigating the density of irregularly shaped objects, which of the following is the correct method to use?

        • Line of symmetry technique

        • Displacement technique

        • Calculating the area under a graph

        • Ripple tank technique

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        8
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        1 mark

        Which of the following correctly describes the importance of the control variables in an investigation?

        • To ensure the change observed is due to the dependent variable only

        • To ensure the change observed is due to the independent variable only

        • To ensure the method gives precise results

        • To ensure the method gives accurate results

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        91 mark

        A student repeats one measurement multiple times from an investigation. The range of values from these measurements is small, but they are not close to the true value.

        Which of the following best describes the student's results?

        • Accurate

        • Precise

        • Accurate and precise

        • Neither accurate nor precise

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        10
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        1 mark

        Which of the following are suitable safety precautions for investigating the cooling of water with different types of insulation?

        • Tie back long hair and wear goggles

        • Wear a lab coat

        • Use a G clamp

        • Keep glassware away from the edge of workbenches

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