Required Practicals_GCSE_Variable (know your IV, DV and CV)
Quiz by Mr R Horn
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- Q1
A variable is any factor that may change (vary)
eg temperature, concentration, rate of reaction, mass, volume
truefalseTrue or False30sEditDelete - Q2
In an experiment, what is meant by the 'independent variable'?
The factor that is measured
A factor that must be kept constant (to ensure validity)
The factor that is (intentionally) changed/selected by the investigator
30sEditDelete - Q3
In an experiment, what is meant by the 'dependent variable'?
The factor that is (intentionally) changed/selected by the investigator
The factor that is measured
A factor that must be kept constant (to ensure validity)
30sEditDelete - Q4
In an experiment, what is meant by the 'control variable'?
The factor that is (intentionally) changed/selected by the investigator
A factor that must be kept constant (to ensure validity)
The factor that is measured
30sEditDelete - Q5
Variables may be 'continuous' or 'categoric'.
(Continuous = can be measured / may be any numerical value)
(Categoric = can be described/labelled. Fits into groups/categories)
Users sort answers between categoriesSorting30sEditDelete - Q6
How should you adjust the microscope to increase the magnification of the image?
Change the objective lens to a higher magnification lens
Turn the coarse focusing wheel
Move the stage further away from the lens
Zoom in
30sEditDelete - Q7
Ribosomes can be viewed using an electron microscope. However, they cannot be viewed using a light microscope. Explain why.
Electron microscopes have a higher magnification and resolution
Light microscopes cannot be adjusted to focus in closely enough
30sEditDelete - Q8
image size = real (actual) size x magnification
A root hair cell was viewed at a magnification of ×50
The image length of the root hair X–Y is 43 mm
Calculate the real length of the root hair in micrometres (µm).
2150µm
1.16mm
860µm
0.86mm
30sEditDelete - Q9
How should you adjust the microscope to obtain a clearer image?
Change the objective lens to a higher magnification lens
Turn the coarse/fine focusing wheel
Zoom in
Use a brighter light source
30sEditDelete - Q10
An experiment investigated the effect of sugar concentration on the mass of potato cylinders.
What is the independent variable?
The change in mass of the potato cylinders
The length of time that the cylinders were left in the solutions
The concentration of the sugar solution
30sEditDelete - Q11
An experiment investigated the effect of sugar concentration on the mass of potato cylinders.
What is the dependent variable?
The length of time that the cylinders were left in the solutions
The change in mass of the potato cylinders
The concentration of the sugar solution
30sEditDelete - Q12
An experiment investigated the effect of pH on the rate of reaction of amylase enzyme.
Which is the independent variable?
The rate of reaction of amylase
Temperature
The pH
30sEditDelete - Q13
An experiment investigated the effect of pH on the rate of reaction of amylase enzyme.
Which is a control variable?
The pH
The rate of reaction of amylase
Temperature
30sEditDelete - Q14
An experiment investigated the effect of light intensity on the rate of photosynthesis using pondweed (eg Elodea).
Which is the independent variable?
The light intensity
The rate of photosynthesis (measured by counting the number of bubbles of O2)
Temperature
30sEditDelete - Q15
An experiment investigated the effect of light intensity on the rate of photosynthesis using pondweed (eg Elodea) by counting the number of bubbles released in 1 minute.
How could the investigator measure the rate of photosynthesis more accurately?
Measure the volume of gas released in 1 minute
Measure the change in mass of the pondweed in 1 minute
Place the pondweed further from the light source
Count the number of bubbles released in 30s.
30sEditDelete - Q16
An experiment investigated the effect of light intensity on the rate of photosynthesis using pondweed (eg Elodea).
Which is the dependent variable?
The light intensity
The rate of photosynthesis (measured by counting the number of bubbles of O2)
Temperature
30sEditDelete - Q17
An experiment investigated the effect of caffeine (stimulant drug) on human reaction time.
Which is the dependent variable?
The reaction time (calculated by measuring the distance the ruler dropped)
Participant consumed coke drink: (a) with caffeine OR (b) with no caffeine
Right hand or left hand used
30sEditDelete - Q18
An experiment investigated the effect of caffeine (stimulant drug) on human reaction time.
Which is a control variable?
The reaction time (calculated by measuring the distance the ruler dropped)
Participant consumed coke drink: (a) with caffeine OR (b) with no caffeine
Right hand or left hand used
30sEditDelete - Q19
An experiment investigated the effect of caffeine (stimulant drug) on human reaction time.
Which is the independent variable?
Participant consumed coke drink: (a) with caffeine OR (b) with no caffeine
Right hand or left hand used
The reaction time (calculated by measuring the distance the ruler dropped)
30sEditDelete - Q20
An experiment investigated the effect of light intensity on the rate of photosynthesis using pondweed (eg Elodea) by counting the number of bubbles released in 1 minute.
Name the gas in the bubbles.
Water vapour
Carbon dioxide
Oxygen
Carbon monoxide
30sEditDelete
