IGCSE Combined Science Exam: Quiz!
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Questions and Answers
- 1.
Which of these are conductors?
- A.
Copper wire
- B.
Paper
- C.
Fuse
- D.
TV aerial
- E.
String on a light switch
Correct Answer(s)
A. Copper wire
C. Fuse
D. TV aerialExplanation
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.Rate this question:
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- 2.
What happens to the current in a circuit if the resistance increases?
- A.
Nothing. Current will be the same.
- B.
Current will fasten
- C.
How am I supposed to know. I am not an electrician
- D.
Current will slow
Correct Answer
D. Current will slowExplanation
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.Rate this question:
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- 3.
When you climb a high mountain the air around you becomes _____
Correct Answer
less
thin
thinner
harder to breatheExplanation
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.Rate this question:
- 4.
Which of these are halogens?
- A.
Mercury
- B.
Bromine
- C.
Iodine
- D.
Fluorine
- E.
Oxygen
Correct Answer(s)
B. Bromine
C. Iodine
D. FluorineExplanation
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.Rate this question:
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- 5.
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?
- A.
Heart rate and breathing rate increases
- B.
Makes you stronger
- C.
Heightens senses and reactions
- D.
Liver releases glucose into blood for energy
- E.
Blood diverted to vital organs
Correct Answer(s)
A. Heart rate and breathing rate increases
B. Makes you stronger
C. Heightens senses and reactions
D. Liver releases glucose into blood for energy
E. Blood diverted to vital organsExplanation
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.Rate this question:
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- 6.
Chlorophyll can be separated from other dyes using.....
- A.
Condensation
- B.
Distillation
- C.
Electrolysis
- D.
Chromatography
Correct Answer
D. ChromatographyExplanation
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.Rate this question:
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- 7.
Physical Change is when a new substance is being formed. A chemical change is when it is a change of state.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
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.Rate this question:
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- 8.
Charged objects are often called...
Correct Answer
Static electricityExplanation
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.Rate this question:
- 9.
Name the ways in which you can separate mixtures.
- A.
Using magnets
- B.
Decanting
- C.
Filtration
- D.
Evaporation
- E.
Distillation
- F.
Chromatography
Correct Answer(s)
A. Using magnets
B. Decanting
C. Filtration
D. Evaporation
E. Distillation
F. ChromatographyExplanation
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.Rate this question:
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- 10.
Osmosis is where the water goes from a ______ concentration to a _____ concentration area.
Correct Answer(s)
high low
high and low
high, low
higher lower
higher and lower
higher, lower
high and lower
high, lower
high lowerExplanation
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.Rate this question:
- 11.
Positively charged objects have lost electrons, Negatively charged objects have gained electrons. Also charged objects attract uncharged (neutral) objects.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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.Rate this question:
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- 12.
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.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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.Rate this question:
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- 13.
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?
Correct Answer
Chromatography, chromatographyExplanation
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.Rate this question:
- 14.
Which of these is right:
- A.
Positive attracts negative, Positive attracts positive
- B.
Positive repels negative, Positive attracts positive
- C.
Positive attracts negative, Positive repels positive
- D.
Positive repels negative, Positive repels positive
Correct Answer
C. Positive attracts negative, Positive repels positiveExplanation
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.Rate this question:
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- 15.
The Vein is a thin wall of muscle and can hold high pressure.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
It's true the vein is a thin wall of muscle but it can hold low pressure, not high pressure.Rate this question:
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- 16.
What are the traits of the alkali metals?
- A.
Low density
- B.
High density
- C.
Soft metals
- D.
Hard metals
- E.
React violently with water
- F.
Unreactive
- G.
More reactive as you go down the group
- H.
Low melting point
Correct Answer(s)
A. Low density
C. Soft metals
E. React violently with water
G. More reactive as you go down the group
H. Low melting pointExplanation
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.Rate this question:
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- 17.
A negatively charged object will discharge if it is touched by a conductor. Often charged objects will spark when the discharge occurs.
- A.
Yeah, pretty much
- B.
Well actually, I disagree
Correct Answer
A. Yeah, pretty muchExplanation
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.Rate this question:
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- 18.
Which of these is a trait of the alkaline metals?
- A.
Very unreactive
- B.
All produce weak alkaline solutions when dissolved in water
- C.
Commonly found underwater
- D.
Low melting point
Correct Answer
B. All produce weak alkaline solutions when dissolved in waterExplanation
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.Rate this question:
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- 19.
How many times does blood pass through the heart during one complete circulation of the body?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
B. 2Explanation
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.Rate this question:
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- 20.
What are the traits of the halogens?
- A.
Non-metallic colour
- B.
Less reactive going down the group
- C.
Trend state, goes from gas to liquid to solid
- D.
Colour becomes darker going down group
- E.
Can displace each other from solutions
Correct Answer(s)
A. Non-metallic colour
B. Less reactive going down the group
C. Trend state, goes from gas to liquid to solid
D. Colour becomes darker going down group
E. Can displace each other from solutionsExplanation
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.Rate this question:
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- 21.
This group's traits are: Colourless, almost totally unreactive with any other element, used when you want an inert atmosphere. What group is this?
Correct Answer(s)
noble gases
noble gases
group 0
group 8
0
8Explanation
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.Rate this question:
- 22.
Na + (SO4)2 =
Correct Answer(s)
Na2(SO4)
Na2(So4)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.Rate this question:
- 23.
If a rod becomes negatively charged, what has happened to the electrons?
- A.
Gained
- B.
Lost
- C.
Nothing
Correct Answer
A. GainedExplanation
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."Rate this question:
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- 24.
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.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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.Rate this question:
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- 25.
What is the job of a heart valve?
- A.
To produce electrical impulses for heart contractions
- B.
To transport oxygen to the body's tissues
- C.
To regulate blood flow and prevent backflow
- D.
To store excess blood for emergencies
Correct Answer
C. To regulate blood flow and prevent backflowExplanation
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.Rate this question:
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- 26.
What is the mass of an electron?
- A.
1
- B.
0
- C.
1/2000
- D.
-1
Correct Answer
C. 1/2000Explanation
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.Rate this question:
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- 27.
Traits of root hair cells are:
- A.
Helps the plant photosynthesize
- B.
Large surface area
- C.
Thin cell membrane
- D.
Take in water and mineral salts
- E.
Long and finger-like
Correct Answer(s)
B. Large surface area
C. Thin cell membrane
D. Take in water and mineral salts
E. Long and finger-likeExplanation
The root hair is underground. How can it photosynthesizeRate this question:
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- 28.
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 ________ _______
Correct Answer(s)
nutrients surface area
nutrients and surface area
nutrients, surface areaExplanation
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.Rate this question:
- 29.
There are an equal amount of protons as there are neutrons.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Not always. There are an equal amount of protons and electronsRate this question:
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- 30.
Coronary heart disease can be caused by.....
- A.
Smoking
- B.
Too much electronics
- C.
Too much fat
- D.
No exercise
- E.
Not studying for exams
- F.
Lack of water
Correct Answer(s)
A. Smoking
C. Too much fat
D. No exerciseExplanation
Surprisingly not studying for exams does not affect your coronary arteries.Rate this question:
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- 31.
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
- A.
Electrons
- B.
Protons
- C.
Atoms
- D.
Electricity
Correct Answer
A. ElectronsExplanation
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.Rate this question:
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- 32.
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.
- A.
I absolutely agree with this
- B.
No way
Correct Answer
B. No wayExplanation
It is the other way around. Metals lose electrons and Non-metals gain electronsRate this question:
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- 33.
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.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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.Rate this question:
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- 34.
In a series circuit the current is the ______ wherever you measure it
Correct Answer
sameExplanation
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.Rate this question:
- 35.
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.
Correct Answer
NucleusExplanation
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".Rate this question:
- 36.
The oppositely charged ions are attracted into a ______ that gets bigger and bigger until it consists of millions of ions.
Correct Answer
latticeExplanation
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.Rate this question:
- 37.
The sum of currents is: A1+A2=A3+A4
- A.
Of course
- B.
I disagree
Correct Answer
B. I disagreeExplanation
The sum of currents is actually A1=A2+A3=A4Rate this question:
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- 38.
The number of electrons in the outer shell is usually equal to the _____ _______ in the periodic table.
Correct Answer
Group number
group
number of groupExplanation
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.Rate this question:
- 39.
Voltage can be shown as V1=V2+V3. A voltmeter is put into parallel not series
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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.Rate this question:
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- 40.
Na3PO4+KOH=NaOH+K3PO4
Correct Answer
Na3PO4+3KOH=3NaOH+K3PO4
1Na3PO4+3KOH=3NaOH+K3PO4Explanation
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.Rate this question:
- 41.
Which one is incorrect?
- A.
No3-
- B.
(So2)4-
- C.
NH4+
- D.
(CO3)2-
Correct Answer
B. (So2)4-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.Rate this question:
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- 42.
What is this?
- A.
Transpirator
- B.
Distillation experiment
- C.
Potometer
- D.
Gizmo
Correct Answer
C. PotometerExplanation
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.Rate this question:
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- 43.
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?
Correct Answer
Ohms law
Ohms
The ohms lawExplanation
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.Rate this question:
- 44.
Traits of plasma are:
- A.
Plasma surrounds cells and carries them along as it flows through the cell walls
- B.
Are fragments of cells
- C.
Blood is about 55% plasma
- D.
Is a flowing liquid
- E.
Contains dissolved nutrients
Correct Answer(s)
A. Plasma surrounds cells and carries them along as it flows through the cell walls
C. Blood is about 55% plasma
D. Is a flowing liquid
E. Contains dissolved nutrientsExplanation
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.Rate this question:
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- 45.
Resistance of a wire increases with:
- A.
Increase in thickness
- B.
Increase in length
- C.
Decrease in thickness
- D.
Decrease in length
Correct Answer(s)
B. Increase in length
C. Decrease in thicknessExplanation
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.Rate this question:
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