Exam code: J249
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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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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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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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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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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1 markWhich 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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1 markWhen 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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1 markWhich 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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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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1 markWhich 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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