GL Practice Questions Gr8 – sheet 5
55.What are the characteristics of the Earth's core?
a) Composed mainly of granite and basalt
b) Divided into the inner and outer core, with the inner core being solid and the outer
core being liquid
c) Surrounded by the lithosphere, which includes the crust and upper mantle
d) Contains vast oceans of water and dense vegetation
56.How does hydroelectric energy work?
a) By converting sunlight into electricity using photovoltaic cells
b) By harnessing the kinetic energy of moving water to generate electricity
c) By burning fossil fuels to produce steam that drives turbines
d) By capturing wind energy with turbines to generate electricity
57.How does the tilt of the Earth's axis primarily affect the seasons on Earth?
a) By causing variations in the Earth's distance from the Sun
b) By influencing the angle at which sunlight strikes different parts of the Earth's surface
c) By affecting the speed of the Earth's rotation
d) By altering the Earth's magnetic field, static electricity is generated from the beam
Scientific method
A. Communication
58.Aristotle once proposed that living things could arise from non-living matter like
dust, but this idea was later refused by Louis Pasteur through experiments. What
does this historical episode tells us?
A. Scientific theories can undergo revision when new evidence is found.
B. It's necessary to replicate experiments multiple times.
C. Scientific theories remain static over time.
D. Scientific theories lack grounding in evidence.
59.After a scientist finishes her experiment and publishes her findings, what step
should another scientist take to verify her results?
A. Ensure that the results align with the existing model.
B. Innovate new technologies guided by the results.
C. Replicate the original experiment as closely as possible.
D. Assess whether the conclusion logically follows from the results.
60.Ahaan conducts a replicated experiment based on a previous scientist's work.
Despite following the original method carefully and conducting multiple trials, Ahaan
obtains different results. What should be Ahaan next course of action?
A. Adjust his results to conform with the existing ones.
B. Conceal his findings to prevent other scientists from seeing them.
C. Share his results to enhance collective understanding.
D. Employ an alternative analytical approach for his results.
61.Lilia intends to investigate the impact of various exercises on her breathing rate.
She plans to monitor her breaths per minute during exercise. What additional step
should Lilia do as part of her experiment?
A. Monitor her pulse rate alongside her breathing rate.
B. Perform warm-up exercises prior to conducting the experiment.
C. Have another person replicate the experiment following her.
D. Document her breathing rate prior to engaging in exercise.
B. Controlled variables
62.Following her plant growth study, Nadine realizes she neglected to accurately
track the amount of fertilizer given to each plant. What adjustment could Nadine
make in future experiments?
A. Employ a chart to document the quantity of fertilizer administered to each plant.
B. Utilize distinct types of fertilizer for individual plant.
C. Note down the dates when the plants receive fertilizers.
D. Ask someone else to do the experiment.
63.Sylvia conducts an investigation to determine how different types of fertilizer affect
plant growth.
She plans to record the height of the plants each week.
What else should she do as part of her experiment?
A. Count the number of flowers on each plant as well as the height
B. Have someone else repeat the experiment
C. Include a group of plants that receive no fertilizer
D. Determine the cost of each type of fertilizer
C. Data interpretation
64.Farah stirs sugar into beakers of water at varying temperatures, with equal
volumes of water in each beaker, and records the mass of dissolved sugar at each
temperature. What can be inferred from her results?
A. Increasing the water temperature by two times results in a two-fold increase in the
mass of dissolved sugar.
B. Higher water temperatures correspond to larger masses of dissolved sugar.
C. Sugar has higher solubility at lower temperatures.
D. Temperature does not influence the mass of sugar that dissolves.
Equipment
65.The temperature of
ethanol is estimated to be
between -10 to -30 0C.
Which of the following
thermometers can be used
to measure the temperature
of ethanol?
Circle the right answer.
D. Graph interpretation
66.Nicole carried out an investigation to determine how
the rate of a chemical reaction changes with
temperature. From her experimental results depicted
on the graph, she can conclude that the rate of
chemical reaction increases as the temperature
increases up to 300 C. what alternative valid conclusion
could be made from her data?
A: The peak of the rate of reaction occurred at 300C.
B: The slowest rate of chemical reaction is seen at
400C
C: No reaction took place above 500C
D: The chemical reaction is fastest at around 300C
67.The graph shows the number of different species
in different aquatic habitats. Use the graph to
determine which aquatic environment is the best to
support life?
A. Salt lakes
B. Fresh water
C. Sea water
D. Brackish water
E. Graphing
68.The vertical axis of a graph is called the y-axis.
For scientific data, what is usually placed along the y-axis?
A. Dependent variables
B. Independent variables
C. A control variable
Salt concentration (parts per
million)
D. Distance
69.The horizontal axis of a graph is called the x-axis.
For scientific data, what is usually placed along the x-axis?
A. Dependent variables
B. Independent variables
C. A control variable
D. Time
F. Identifying variables
70.Ahmed wants to determine whether the amount of sugar dissolved in water will be
affected with the temperature of the water. What is the independent variable in
Ahmed’s investigation?
A. the mass of sugar added to the water
B. the amount of water in the beaker
C. the number of times the water is stirred
D. the temperature of the water.
Temperature0C
G. Reliability
71.Karim wanted to know the number of
pigeon birds in his neighbourhood. He
recorded the number of the first 5 birds he
sees. How can Karim increase the reliability of
his results?
10
22
40
61
79
A. record the species of the next 12 birds he sees
B. record the species of the sixth birth he sees
C. record the species of birds in other neighbourhoods
D. record the species of dogs as well as birds.
H. Safety
Bird
1
2
3
4
5
Mass of sugar
dissolved g
240
307
355
426
488
Species
Sparrow
Sparrow
Pigeon
Pigeon
Pigeon
72.To ensure that the students are working safely while carrying out an experiment
that includes harmful chemicals, what measure should they take?
A. wearing safety gloves.
B. wearing short sleeves shirts
C. eating and drinking inside the lab
D. increase ventilation by opening the window.
I.
Sources of error
73.Elias measures the melting points of three substances. He then compared his
results to those in the literature (textbooks, journal articles, etc)
Substance
Elias’s results
Literature results
X
97
100
Y
65
70
Z
53
58
Elias realised that his results are different to those in the literature. What can be the
most likely reason for this?
A: Elias did not take the correct safety measures.
B: There was a defect in his measuring device
C:He compared his results against the wrong substances
D: The literature values are incorrect.
J. Trials and reliability
74.Lea releases a ball down ramps made up of different materials and record the
time it takes for the ball to reach the bottom of each one.
Why did Lea carry out three trials?
Ramp material
Time taken
(seconds)
Trial
Trial
1
2
Trial
3
Carpet
metal
wood
glass
A: to ensure that the ball takes the same time to travel down the ramp
B: to explore different types of materials
C: to make sure that the time taken for the ball to travel down each ramp is reliable
D: to use her data to predict the time taken by the ball to travel to the bottom of the
next ramp