IGCSE Combined Science Exam: Quiz!

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1. Match the following.
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About This Quiz
IGCSE Combined Science Exam: Quiz! - Quiz

This IGCSE Combined Science Exam Quiz assesses key concepts in biology, chemistry, and physics, focusing on human anatomy, blood circulation, and the properties of blood cells. It's designed to test understanding and application of scientific principles critical for IGCSE students.

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2. Match the following.
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3. Which of these is right:

Explanation

The correct answer is "Positive attracts negative, Positive repels positive." This is based on the principles of electrical charge. Positive charges attract negative charges because opposite charges attract each other. On the other hand, positive charges repel other positive charges because like charges repel each other.

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4. Match the following.
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5. The transition metals are shiny hard solids (except mercury), they usually produce brightly colored chemical compounds, high densities, high melting points and are often used as catalysts.

Explanation

The statement accurately describes the characteristics of transition metals. They are typically shiny, hard solids (excluding mercury), and they have a tendency to form brightly colored chemical compounds. Transition metals also tend to have high densities, high melting points, and are commonly used as catalysts. Therefore, the answer "True" is correct.

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6. Match the following.
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7. If a rod becomes negatively charged, what has happened to the electrons?

Explanation

When a rod becomes negatively charged, it means that it has gained electrons. Electrons are negatively charged particles, so when the rod gains electrons, it acquires a negative charge. This is because electrons are transferred from another object to the rod, resulting in an excess of electrons on the rod's surface. Therefore, the correct answer is "gained."

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8. Water is very important for plants but many plants seem to waste a lot of it. When it is hot about 700 liters of water will evaporate from the leaves of an oak tree each day. The loss of water vapor from leaves is called transpiration. It helps the plant by keeping the leaves cool, while also helping it suck up more water from the roots.

Explanation

Plants do indeed lose a significant amount of water through transpiration. This process helps to keep the leaves cool and also aids in the absorption of water from the roots. The statement accurately reflects the importance of water for plants and the role of transpiration in their survival.

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9. What is the job of a heart valve?

Explanation

The job of a heart valve is to prevent backflow and ensure that blood flows in one direction. It keeps the blood going forwards and ensures that it does not go backwards. This is important for the proper functioning of the heart and the circulation of blood throughout the body.

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10. Chlorophyll can be separated from other dyes using.....

Explanation

Chromatography is a technique used to separate and analyze mixtures. In this case, chlorophyll can be separated from other dyes using chromatography because it has different physical and chemical properties compared to other dyes. Chromatography involves passing a mixture through a stationary phase and a mobile phase. The different components of the mixture will move at different rates based on their affinity for the stationary phase, allowing for their separation. Therefore, chromatography is an effective method to separate chlorophyll from other dyes.

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11. Distillation is the separation of a mixture of two substances. If one substance evaporated at 70 degrees and the other at 100 degrees we can heat it at 70 degrees so it evaporates and gets collected in the other beaker. As other substance needs to be 100 degrees to evaporate it is still where it is. Therefore they have been separated. This is distillation. 

Explanation

Distillation is a process used to separate a mixture of two substances based on their different boiling points. In this case, if one substance evaporates at 70 degrees and the other at 100 degrees, heating the mixture at 70 degrees will cause the substance with the lower boiling point to evaporate and collect in another beaker. Since the other substance requires a higher temperature to evaporate, it remains in its original location. This process effectively separates the two substances, demonstrating that the statement is true.

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12. Just like animals plants need to move substances around their body. To do this they have special tissue called xylem and phloem.
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13. Match the following.
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14. Match the following.
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15. How many times does blood pass through the heart during one complete circulation of the body?

Explanation

During one complete circulation of the body, blood passes through the heart two times. The first pass occurs when deoxygenated blood from the body enters the right atrium and then gets pumped to the lungs to pick up oxygen. After oxygenation, the blood returns to the heart and enters the left atrium. From there, it is pumped out to the rest of the body, completing the second pass through the heart.

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16. In an electric circuit, current is the flow of ______. The bigger the current, the more _____ are flowing around the circuit. The wires carry the ______ from one terminal around the circuit to the other terminal

Explanation

In an electric circuit, current is the flow of electrons. The bigger the current, the more electrons are flowing around the circuit. The wires carry the electrons from one terminal around the circuit to the other terminal.

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17. What happens to the current in a circuit if the resistance increases?

Explanation

When the resistance in a circuit increases, it becomes more difficult for the current to flow. This is because resistance opposes the flow of electrons. As a result, the current in the circuit will slow down.

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18. Physical Change is when a new substance is being formed. A chemical change is when it is a change of state.

Explanation

It is the other way around. Physical change is a change of state and can easily be reversed. A chemical change is when a new substance is formed and is very hard to reverse.

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19. A negatively charged object will discharge if it is touched by a conductor. Often charged objects will spark when the discharge occurs.

Explanation

The given answer "Yeah, pretty much" agrees with the statement that a negatively charged object will discharge if it is touched by a conductor. It also acknowledges that often charged objects will spark when the discharge occurs.

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20. Match the following.
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21. When metals react with each other chemical bonds are created or broken. During bonding, other atoms try to attain a full electron shell. Atoms can be joined together in three possible ways. Match.
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22. In a series circuit the current is the ______ wherever you measure it

Explanation

In a series circuit, the current is the same wherever you measure it. This is because in a series circuit, the current has only one path to flow through. Therefore, the current that flows through one component of the circuit is the same as the current that flows through any other component in the circuit. This is a fundamental property of series circuits and is due to the fact that the current is conserved in a closed loop.

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23. Which of these are halogens?

Explanation

Bromine, iodine, and fluorine are halogens. Halogens are a group of elements in the periodic table that are highly reactive and have seven valence electrons. They are known for their ability to form salts when they react with metals. Mercury and oxygen, on the other hand, are not halogens. Mercury is a transition metal and oxygen is a nonmetal.

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24. The Vein is a thin wall of muscle and can hold high pressure.

Explanation

It's true the vein is a thin wall of muscle but it can hold low pressure, not high pressure.

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25. Match the following blood vessels.
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26. Match the following.
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27. Positively charged objects have lost electrons, Negatively charged objects have gained electrons. Also charged objects attract uncharged (neutral) objects.

Explanation

This statement is true because positively charged objects have lost electrons, which results in an overall positive charge. Conversely, negatively charged objects have gained electrons, leading to an overall negative charge. Additionally, charged objects can attract uncharged or neutral objects due to the presence of electric fields.

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28. All the dyes dissolve in water. Some dyes dissolve faster than others. The ones that dissolve well move up the paper more and the ones that don't dissolve as well stay near the bottom. What is this?

Explanation

Chromatography is a technique used to separate and analyze mixtures based on the differential solubility of its components. In this process, a mixture is dissolved in a solvent and then allowed to move through a stationary phase, such as a piece of paper. As the solvent moves, the different components of the mixture, which have varying solubilities, separate and move at different rates. The ones that dissolve well in the solvent will move up the paper more, while the ones that do not dissolve as well will stay near the bottom. This process allows for the identification and analysis of the different components in a mixture.

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29. There are an equal amount of protons as there are neutrons.

Explanation

Not always. There are an equal amount of protons and electrons

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30. Match the following.
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31. Match the following.
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32. The sum of currents is: A1+A2=A3+A4

Explanation

The sum of currents is actually A1=A2+A3=A4

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33. Voltage can be shown as V1=V2+V3. A voltmeter is put into parallel not series

Explanation

When a voltmeter is connected in parallel, it is connected across the component or circuit being measured. This allows the voltmeter to measure the potential difference (voltage) across the component without affecting the current flowing through it. In contrast, when a voltmeter is connected in series, it would disrupt the circuit and affect the current flow, giving inaccurate measurements. Therefore, the statement "A voltmeter is put into parallel not series" is true.

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34. Osmosis is where the water goes from a ______ concentration to a _____ concentration area.

Explanation

Osmosis is the movement of water molecules from an area of higher concentration (hypertonic) to an area of lower concentration (hypotonic) through a semipermeable membrane. This process aims to equalize the concentration of solutes on both sides of the membrane. Therefore, the correct answer is "high low" as it represents the movement of water from an area of higher concentration to an area of lower concentration. The other options provided are variations of the correct answer, but they all convey the same concept of osmosis.

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35. This group's traits are: Colourless, almost totally unreactive with any other element, used when you want an inert atmosphere. What group is this?

Explanation

This group of elements is known as the noble gases. They are colorless and have very low reactivity with other elements, making them ideal for creating inert atmospheres. The noble gases are located in group 0 or group 8 of the periodic table. The answer options "noble gases," "group 0," "group 8," and the numbers 0 and 8 all refer to the same group of elements with these specific traits.

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36. The number of electrons in the outer shell is usually equal to the _____ _______ in the periodic table.

Explanation

The number of electrons in the outer shell is usually equal to the group number in the periodic table. This is because the group number represents the number of valence electrons, which are located in the outermost shell of an atom. Valence electrons are responsible for the chemical behavior of an element, including its ability to form bonds with other atoms. Therefore, knowing the group number can help determine the number of electrons in the outer shell.

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37. What is the mass of an electron?

Explanation

The mass of an electron is extremely small compared to other particles. It is approximately 1/2000th the mass of a proton or a neutron. This means that electrons have a very low mass and contribute very little to the overall mass of an atom.

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38. When you climb a high mountain the air around you becomes _____

Explanation

When you climb a high mountain, the air around you becomes less dense. As you ascend, the atmospheric pressure decreases, resulting in thinner air with fewer molecules per unit volume. This decrease in air density makes it harder to breathe because there is less oxygen available for inhalation.

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39. When metals react they gain outer electron shells to achieve a full electron shell. When non-metals react with metal they lose outer electron shells in order to leave a full electron shell.

Explanation

It is the other way around. Metals lose electrons and Non-metals gain electrons

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40. Coronary heart disease can be caused by.....

Explanation

Surprisingly not studying for exams does not affect your coronary arteries.

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41. Which of these are conductors?

Explanation

Copper wire, fuse, and TV aerial are conductors because they allow the flow of electric current. Copper is an excellent conductor of electricity due to its high conductivity. Fuses are made of conductive materials that melt when there is excessive current, breaking the circuit. TV aerials are designed to receive electromagnetic signals and transmit them to the television, which requires conducting materials to work effectively. On the other hand, paper and string on a light switch are insulators as they do not allow the flow of electric current.

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42. Which one is incorrect?

Explanation

The given anion, (So2)4-, is incorrect. This is because the chemical formula for sulfite ion is SO32-. The subscript 4 in the given anion suggests that there are four sulfur atoms, which is not correct.

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43. What is this?

Explanation

A potometer is a device used to measure the rate of transpiration in plants. It consists of a chamber that is filled with water and attached to a plant stem. As the plant transpires, water is drawn up through the stem and into the chamber, causing the water level to decrease. By measuring the rate at which the water level changes, the rate of transpiration can be determined. Therefore, a potometer is the most suitable option among the given choices as it accurately describes the device used to measure transpiration in plants.

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44. Traits of root hair cells are:

Explanation

The root hair is underground. How can it photosynthesize

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45. Name the ways in which you can separate mixtures.

Explanation

The given answer lists various methods for separating mixtures. Using magnets can be used to separate mixtures containing magnetic materials. Decanting involves pouring off the liquid portion of a mixture while leaving the solid behind. Filtration involves passing a mixture through a filter to separate the solid from the liquid. Evaporation involves heating a mixture to evaporate the liquid and leave behind the solid. Distillation is a process where a mixture is heated to separate its components based on their different boiling points. Chromatography is a technique that uses a solvent to separate the components of a mixture based on their different solubilities.

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46. Which of these is a trait of the alkaline metals?

Explanation



Alkaline metals share the trait of producing weak alkaline solutions when dissolved in water. This characteristic distinguishes them from other elements, as their interaction with water results in a solution with a pH greater than 7, indicating alkalinity. Additionally, alkaline metals are known for their low melting points, further contributing to their distinct properties in the periodic table.
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47. Match the following.
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48. The current flowing through a wire is proportional to the potential difference (voltage) across it. Provided the temperature remains constant. What is this law called?

Explanation

The statement describes Ohm's Law, which states that the current flowing through a wire is directly proportional to the voltage across it, as long as the temperature remains constant. Ohm's Law is a fundamental principle in electrical circuits and is named after the German physicist Georg Simon Ohm. The answer options provided all refer to the same law, with variations in capitalization and article usage.

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49. Resistance of a wire increases with:

Explanation

The resistance of a wire is directly proportional to its length. As the length of a wire increases, the number of collisions between the electrons and the atoms in the wire also increases, leading to a higher resistance. On the other hand, the resistance of a wire is inversely proportional to its cross-sectional area, which is determined by its thickness. A decrease in thickness results in a smaller cross-sectional area, causing the resistance to increase. Therefore, an increase in length and a decrease in thickness both contribute to an increase in the resistance of a wire.

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50. Coronary arteries supply blood directly to the heart to give it the _______ and oxygen it needs to respire and produce its energy.  The red blood cells that carry the oxygen have a special bi-concave shape to give them a larger ________  _______

Explanation

The coronary arteries supply blood directly to the heart to give it the nutrients and oxygen it needs to respire and produce its energy. The red blood cells that carry the oxygen have a special bi-concave shape to give them a larger surface area. This allows for efficient exchange of nutrients and oxygen between the blood and the heart tissues.

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51. One very important hormone is adrenaline. Adrenaline is involved in the fight or flight response that prepares your body to stay and fight or run away. Adrenaline has many target organs. What are the ways in which adrenaline can affect the body?

Explanation

Adrenaline can affect the body in several ways. First, it increases heart rate and breathing rate, which helps to supply more oxygen to the muscles and increase overall energy levels. Additionally, adrenaline can make a person stronger by increasing muscle strength and power. It also heightens senses and reactions, making a person more alert and responsive to their surroundings. Adrenaline triggers the liver to release glucose into the blood, providing a quick source of energy for the body. Lastly, adrenaline diverts blood flow to vital organs, ensuring that they receive enough oxygen and nutrients to function properly during a fight or flight situation.

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52. What are the traits of the alkali metals?

Explanation

The traits of alkali metals include low density, soft metals, reacting violently with water, being more reactive as you go down the group, and having a low melting point. Alkali metals are known for their low density, which means they have a low mass per unit volume. They are also soft metals, meaning they can be easily cut or shaped with a knife. Alkali metals react violently with water, producing hydrogen gas and an alkaline solution. As you go down the group, alkali metals become more reactive due to the increase in atomic size. Additionally, alkali metals have a low melting point, meaning they can easily melt or be converted into a liquid state at relatively low temperatures.

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53. What are the traits of the halogens?

Explanation

The halogens exhibit several traits. Firstly, they have a non-metallic color. Secondly, their reactivity decreases as you move down the group. Thirdly, their states of matter follow a trend, transitioning from gas to liquid to solid as you move down the group. Additionally, the color of the halogens becomes darker as you go down the group. Lastly, they have the ability to displace each other from solutions.

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54. Covalent compounds are formed when non-metal atoms react together. As these atoms come near their outer electrons are attracted to the ______ of both atoms and become shared by the atoms. These compounds are held together by this sharing of electrons. A pair of electrons shared in this way is known as a covalent compound.

Explanation

In covalent compounds, non-metal atoms react and come near each other. The outer electrons of these atoms are attracted to the nucleus of both atoms and become shared by the atoms. This sharing of electrons holds the compounds together. Therefore, the correct answer is "Nucleus".

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55. Traits of plasma are:

Explanation

Plasma is a component of blood that surrounds cells and carries them along as it flows through the cell walls. It is also a flowing liquid that makes up about 55% of blood volume. Additionally, plasma contains dissolved nutrients, which are essential for the proper functioning of cells.

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56. The oppositely charged ions are attracted into a ______ that gets bigger and bigger until it consists of millions of ions.

Explanation

When oppositely charged ions come together, they are attracted to each other and form a repeating pattern known as a lattice. This lattice structure continues to grow as more and more ions are added, eventually consisting of millions of ions. The lattice provides stability and ensures that the positive and negative charges are evenly distributed throughout the structure.

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57. Na3PO4+KOH=NaOH+K3PO4

Explanation

The correct answer is Na3PO4+3KOH=3NaOH+K3PO4. This is because the balanced equation shows that for every 1 mole of Na3PO4, 3 moles of KOH are required to produce 3 moles of NaOH and 1 mole of K3PO4. The coefficient "1" in front of Na3PO4 is not necessary because it is implied that there is only 1 mole of Na3PO4.

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58. What term is commonly used to refer to objects that hold an electric charge?

Explanation

Charged objects are often called "static electricity" because when objects acquire an electric charge, the charge tends to remain in one place or "static." This means that the charge does not easily flow or move from one object to another. Static electricity is commonly observed when objects become charged through friction or contact with other charged objects. The charged objects can then attract or repel each other due to the imbalance of positive and negative charges.

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59. Na + (SO4)2 =

Explanation

The correct answer is Na2(SO4). This is because when sodium (Na) reacts with sulfate (SO4), the ionic compound formed is sodium sulfate (Na2SO4). The number 2 in front of Na indicates that there are two sodium ions present in the compound. The correct answer is not Na2(So4) because the chemical formula for sulfate is SO4, not So4.

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Match the following.
Match the following.
Which of these is right:
Match the following.
The transition metals are shiny hard solids (except mercury), they...
Match the following.
If a rod becomes negatively charged, what has happened to the...
Water is very important for plants but many plants seem to waste a lot...
What is the job of a heart valve?
Chlorophyll can be separated from other dyes using.....
Distillation is the separation of a mixture of two substances. If one...
Just like animals plants need to move substances around their body. To...
Match the following.
Match the following.
How many times does blood pass through the heart during one complete...
In an electric circuit, current is the flow of ______. The bigger the...
What happens to the current in a circuit if the resistance increases?
Physical Change is when a new substance is being formed. A chemical...
A negatively charged object will discharge if it is touched by a...
Match the following.
When metals react with each other chemical bonds are created or...
In a series circuit the current is the ______ wherever you measure it
Which of these are halogens?
The Vein is a thin wall of muscle and can hold high pressure.
Match the following blood vessels.
Match the following.
Positively charged objects have lost electrons, Negatively charged...
All the dyes dissolve in water. Some dyes dissolve faster than others....
There are an equal amount of protons as there are neutrons.
Match the following.
Match the following.
The sum of currents is: A1+A2=A3+A4
Voltage can be shown as V1=V2+V3....
Osmosis is where the water goes from a ______ concentration to a _____...
This group's traits are: Colourless, almost totally unreactive...
The number of electrons in the outer shell is usually equal to the...
What is the mass of an electron?
When you climb a high mountain the air around you becomes _____
When metals react they gain outer electron shells to achieve a full...
Coronary heart disease can be caused by.....
Which of these are conductors?
Which one is incorrect?
What is this?
Traits of root hair cells are:
Name the ways in which you can separate mixtures.
Which of these is a trait of the alkaline metals?
Match the following.
The current flowing through a wire is proportional to the potential...
Resistance of a wire increases with:
Coronary arteries supply blood directly to the heart to give it the...
One very important hormone is adrenaline. Adrenaline is involved in...
What are the traits of the alkali metals?
What are the traits of the halogens?
Covalent compounds are formed when non-metal atoms react together. As...
Traits of plasma are:
The oppositely charged ions are attracted into a ______ that gets...
Na3PO4+KOH=NaOH+K3PO4
What term is commonly used to refer to objects that hold an electric...
Na + (SO4)2 =
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