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WorksheetsPTS 15
Total questions: 45
Worksheet time: 23mins
The drawing below shows some organisms in a food chain. Which word describes the worm?
Producer
Predator
Primary consumer
Secondary consumer
The drawing shows some organisms in a food chain. In one season, the number of moles decreased. What will be the effect of this on the food chain?
A decrease in number of worms
An increase in number of worms
An increase in number of owls
An increase in number of leaves
Pyramid of numbers shows the flow of energy between organisms. This energy flow is:
Lost as you go along the Levels
Always same at each Level
Most available at Level 1
Equal at each level
A group of scientists are investigating on factors that can lead to high blood pressure. They investigated on women of various ages. During the investigation process, the team tested these women based on their daily routines for a year. The scientist investigation was biased. What made it biased?
The women been tested had varied age
The team only tested women
The investigation was conducted for only a year
The factor considered was only daily routines
When people exercise, the volume of blood per minute needed to supply different parts of the body changes. This is shown in the bar chart. What conclusion can be reached based on the data?
The muscles need more blood during exercise so that you can become strong
You can go for a long run after a meal
The muscles need more blood to be able to make energy
The blood supply to the brain before and during exercises should have been different
Two isotopes of oxygen and must have the same:
Chemical symbol and number of neutrons
Atomic mass and atomic number
Atomic mass and number of neutrons
Chemical symbol and atomic number
Figure 1 shows the arrangement of electrons in a fluorine atom. What is will be the electrical charge for a fluorine ion?
-1
1
-2
0
Karen wants to pump up her car tyre. As she does so, she notices that the pump becomes hot. Which explanation is correct?
The gas molecules are moving less randomly
More collisions between the gas molecules and the wall of the tyre
Less collisions between the gas molecules and the wall of the tyre
There is changes in the motion of the gas molecules
Aristotle lived in Greece over 2000 years ago. He said that the heavier an object is, the faster it will fall to the ground. The drawings show a bowling ball, a cricket ball and a ping-pong ball. Lila dropped them all at the same time from the same height. Which statement supports Aristotle’s hypothesis?
All the three balls because the size doesn’t affect how fast they fall
They were all dropped at the same time so they will fall down at the same time
The bowling ball because it has the greatest mass
The ping-pong because it is little and its bound to reach first
A lithium atom has 3 protons and 4 neutrons. How many electrons are there in lithium?
7
4
6
3
The water snake Natrix sipedon lives on small islands in Lake Erie in North America and on the nearby mainland.
The colour pattern on the body of the snakes is inherited. There are three body patterns.
There is much more vegetation on the mainland than on the islands. Most of the snakes on the mainland are strongly banded. Snakes from the mainland interbreed with snakes on the islands
Suggest how the proportions of strongly banded and unbanded snakes on the islands would change over a number of years if this interbreeding stopped.
Proportion of strongly banded snakes would decrease
Proportion of strongly banded snakes would Increase
Proportion of unbanded snakes would decrease
Both strongly banded snakes and unbanded snakes would stay the same
In a chemistry lesson, the teacher mapped the mass of a neutron to a ping pong ball. What would be another good representation for the mass of an electron?
Salt grain
Pea
Orange seed
Grape
During Diwali fire sparklers are used a lot and this turns to heat up the air. What are the heat transfers involved?
Convection and conduction
Convection, radiation and conduction
Convection and radiation
Conduction and radiation
Crude oil is a mixture of hydrocarbons.
The hydrocarbons in crude oil are separated into fractions by fractional distillation. Figure 1 shows a fractional distillation column.
Why do the fractions separate?
The fractions have different flammability
The fractions have different boiling points
The fractions have different melting points
The fractions have different viscosity
This question is about electrolysis.
A student investigates the mass of copper produced during electrolysis of copper chloride solution. The diagram shows the apparatus. Which gas is produced at the positive electrode (anode)?
carbon dioxide
hydrogen
oxygen
chlorine
Richard wanted to find out the best conditions for growing lettuce plants. He took 4 trays and planted 8 lettuce plants in each. The results of his investigation are shown. Look at the table. Which variables did Richard change in his investigation?
light level and air temperature
soil moisture and type of soil
air temperature and soil moisture
type of soil and light level
Plants that grow in moist condition produces hydrogen ions. Richard wants to confirm for his lettuce plants so he uses Triphenyl. Triphenyl is a chemical that turns red in the presence of hydrogen ions. What will Richards results show?
Lettuce in all the trays will turn red
Lettuce in tray A only will turn red
Lettuce in tray C only will turn red
Lettuce in both tray A and C will turn red
Pluto was discovered in 1930. It was classified as a planet.
In 2006, scientists agreed that Pluto is not a planet.
The diagram below shows our solar system.
From the diagram, what supports the idea that Pluto is not a planet?
It orbits the sun
It is too small
The way it orbits is different
It has an orbit
The drawings shows the remains of an animal found in a rock and what Scientists think the animal should look like.
Use these diagrams to decide on the statement that is correct.
The animal is a reptile
The animal is a mammal
The animal is a bird
The animal is bird and mammal
Alia pulled a muscle whilst exercising this morning. Her mother gave her a self-heating pack to put on the affected area. She had to twist the pack until the liquids mixed before using it.
What type of energy causes the pack to produce heat?
Kinetic
Electric
Thermal
Chemical
Alia pulled a muscle whilst exercising this morning. Her mother gave her a self-heating pack to put on the affected area. She had to twist the pack until the liquids mixed before using it. When the liquids in Alia’s self-heating pack mix, they react and produce heat.
What type of reaction occurs between the liquids?
a. Combustion
Exothermic
Endothermic
Neutralisation
Two large semi-precious stones are discovered. A student is asked to find out what material each of the two stones is made of.
The student does this by determining the density of the material of each stone. Figure 1 shows the two stones.
She fills a displacement can with water and puts rock A in the displacement can.
Which one of the statements below is the correct statement?
The volume of the water displaced by the rock is the volume of the rock
The volume of the water displaced is the density of the rock
The mass of the water displaced is the volume of the rock
The density of the water displaced is the density of the rock
The table below shows the mass and volume of a rock. The density of the rock is:
0.16 g/ cm³
111,9770.4 g/ cm³
6.20 g/ cm³
6.24 g/ cm³
A student researched about density of different substances as in the diagram. Water has a density of 1000 kg/ m³.
Which substance will float in water?
aluminium
hydrogen
iron
glass
The diagram shows the chemical symbols of some elements in the periodic table.
The shaded element and helium are in period one because?
They are noble gases
They are the lightest
They occupy the inner most shell
They occupy the outer shell
A fisherman pulls a boat towards land. The forces acting on the boat are shown in Diagram 1. What is the resultant force on the boat?
50N
200N
0N
350N
The drawing shows a plant called Tillandsia. The Tilandsia gets its nutrients from the tree.
What will be the effect on the tree?
a. The tree will get more sunlight
The tree will have more leaves
The tree cannot grow well
The tree will grow bigger
A student used some everyday items to investigate static electricity. Figure 1 shows a flexible plastic strip being rubbed with a cloth.
Rubbing the plastic strip with the cloth causes the strip to become negatively charged because:
a. Positive electrons move from the cloth onto the plastic strip
protons move from the cloth onto the plastic strip
electrons move from the plastic strip onto the cloth
electrons move from the cloth onto the plastic strip
A student charges two identical plastic strips using the same cloth. What would happen if the charged rods are brought close to each other?
There is no force between the strips
The strips repel each other
The strips attract each other
The strips discharge
DNA is a polymer, made of smaller molecules joined together. Which statement correctly describes DNA
DNA is made from a chain of amino acid molecules
DNA is made from a chain of protein molecules
DNA is made from a chain of fatty acid molecules
DNA is made from a chain of nucleotide molecules
The diagram shows how a lens forms an image. Which statement correctly describes the image?
The same size and upright
Smaller and upright
Larger and upside down
Smaller and upside down
The fruit fly on the left has normal wings. The one on the right has curly wings. What is the mostly likely cause of this difference?
An adaptation
A pathogen
A mutation
A predator
Joanne burnt four different crisps.
She predicted that the bigger the crisp, the longer it will burn. In what part of her write up should she write this sentence?
Conclusion
Hypothesis
Method
Evaluation
Sara heats an unknown solid substance and measures the temperature changes over time. Choose the correct labels for the diagram.
A = condensing, B = evaporating
A = melting, B = boiling
A = Boiling, B = evaporating
A = freezing, B = melting
What can be concluded from the results of this experiment?
When a substance is changing state, its temperature increases
When a substance is changing state, its temperature stays the same
When a substance changes state, its temperature decreases
When a substance changes state, it's volume decreases
Hessa makes a model cell for homework. She makes a cake and uses candy to decorate. What does the candy represent?
Tissues
Organs
Different cells
Structures within a cell
A radioactive source contains 6 micrograms of strontium-90.
The graph shows how the mass of the strontium-90 will decrease as the nuclei decay.
The half life is the time required for one half of the initial mass to decay.
What is the half life of strontium-90?
28 years
90 years
45 years
More than 90 years
The four metals have different reactivities.
Use the information in the table to put the four metals in order of reactivity, from most reactive to least reactive.
copper, iron, magnesium, zinc
zinc, magnesium, copper, iron
magnesium, zinc, iron, copper
magnesium, zinc, copper, iron
A scientist draws a conclusion from the results of her experiment. What would a different scientist do to check the original conclusion?
Suggest a new conclusion using the same data
Evaluate the conclusion by studying the whole investigation report
Change the results to make sure that they fit the conclusion
Change the current model to fit the conclusion
What is the role of the decomposer in this food chain?
To break down organic matter
to cause disease
to produce sugar in the presence of light
as a food source for the producer
The diagram represents different models of the atom. The proposal of these models by scientists can be described as:
A hypothesis
A conclusion
An observation
A theory
Roudha investigates the breakdown of starch into glucose, with an enzyme catalyst called amylase. She designs an experiment to see whether temperature affects the reaction. Which statement would be the most appropriate hypothesis for her experiment?
Amylase is the only enzyme that can catalyse this reaction
At higher temperatures, less amylase should be used
At low temperatures, an increase in temperature causes an increase in the rate of reaction
If glucose is produced, then the amylase is active
Roudha collects the data shown in the graph. Which statement is correct?
At 10°C the relative activity was 40%
The relative activity is higher at 70°C than 60°C
The relative activity is highest at 40°C
The activity of salivary and gut amylase is totally different
What is the relative formula mass (Mr) of titanium dioxide, TiO2?
Relative atomic masses (Ar): O = 16 Ti = 48
64
768
80
128
The equation shows a simple redox reaction.
In this reaction, what is oxidised?
CuO + Mg→ MgO + Cu
Cu
O
Mg
CuO
