OCR Combined Science B Papers 4 and 8 Automock

#1. Which of the following descriptions best matches the hormonal system?

Acts slowly, but affects multiple parts of the body

Acts quickly, but on specific parts of the body

#2. In what part of the cells does aerobic respiration take place?

Mitochondria

Cytoplasm

Chloroplasts

Ribosomes

#3. Solutions of more than pH 7 are?

alkaline

neutral

acidic

#4. What is the chemical symbol for sodium?

#5. In aqueous solutions such as sodium chloride solution, there will be positively charged ions from the salt (Na⁺) as well as hydrogen ions (H⁺). What is the rule that determines which will be discharged at the cathode.

Always the ions from the salt e.g. Na⁺

The least reactive ions

The most reactive ions

#6. Which of the following are problems with using biofuels as a replacement for oil?

Select all that apply:

they often replace forests that are cut down to produce biofuels

they have high energy density

they need land to grow and compete with agriculture for food production

they consume fossil fuels when they are planted, harvested, shipped and burned

they have low energy density

#7. What is the chemical symbol for potassium?

#8. Which form of radiation is most ionising?

beta particles

gamma rays

alpha particles

#9. What state of matter has particles which are close together and vibrate around fixed positions?

liquids

gases

solids

#10. Why is magnesium a better electrical conductor than sodium?

Group 2 magnesium has two spare electrons to donate to the delocalised pool, whereas, sodium atoms only have one electron to donate. This means there are more electrons to carry the charge

Group 1 sodium is less electrically conductive because it quickly forms impurities that prevent efficient conduction

#11. What is the function of a resistor?

safety component which can break a faulty circuit

gives power to a circuit

provides a constant resistance

allows current to only flow one way

two or more cells in a circuit

provides variable resistance

makes or breaks a circuit

measures current

measures potential difference

releases light

#12. Which of the following are strong acids?

Select all that apply:

ethanoic acid

hydrochloric acid

nitric acid

boric acid

sulfuric acid

carbonic acid

#13. Why is diamond hard?

Diamond is hard because it is composed of particular isotopes of carbon with extra neutrons, making the material more dense

Diamond is hard because it is made of ionically bonded carbon atoms.

Diamond is hard because carbon atom is covalently bonded to 4 other carbon atoms, in a tetrahedral arrangement.

#14. What is an alpha particle?

two neutrons without any protons

high frequency electromagnetic radiation

two protons and two neutrons but no electrons

an electron

#15. Complete the equation: H⁺(aq) + OH⁻(aq) → ….

H₂O(l)

2H₂O(l)

OH₂(aq)

CO₂(g)

Remember:

acids produce an excess of hydrogen ions

alkalis produce an excess of hydroxide ions

hydrogen ions and hydroxide ions come together to make water which is neutral.

#16. Which form of radiation is least ionising?

beta particles

alpha particles

gamma rays

#17. Where does blood from the aorta travel to?

The rest of the body

The lungs

#18. Which theory do we use to describe states of matter?

Geometric Theory

Particulatory Coherence Theory

Particle/Kinetic Theory

#19. Cobalt is a magnetic material – true or false?

true

false

#20. What is the resolution of electron microscopes limited by?

the magnification x width of the eyepiece

the wavelength of infrared light

the wavelength of electrons

#21. Is natural gas renewable?

yes

no

partially

#22. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.

#23. Is acceleration a vector or a scalar?

vector

scalar

#24. Copper can be purified using electrolysis of copper sulfate solution. For this process we use the setup in the image below. Complete the half equation for the reaction at the cathode. Cu²⁺ + 2e →

Cu

CuO

SO₄²⁻

#25. What is induced magnetism?

when water comes close to a magnet it begins to heat up slowly due to the magnetic field

temporary magnetic properties which are passed on to magnetic materials in the presence of magnetic fields

where two bar magnets are placed on top of each other and they rotate due to the magnetic field

#26. What is an isotope?

an atom that has gained or lost electrons

two neutrons without any protons

an atom which has a different number of neutrons

#27. What is the role of starch synthase?

breaks down proteins in the diet

synthesises glycogen from glucose

synthesises starch from glucose

synthesises DNA from its monomers

breaks down fats in the diet

breaks down starch to small sugars such as maltose

breaks down hydrogen peroxide made during cell reactions

#28. By which process does water in the oceans and lakes move into the atmosphere?

condensation

distillation

sublimation

precipitation

evaporation

#29. Lead has 4 stable isotopes. ²⁰⁴Pb (abundance – 1.4%), ²⁰⁵Pb (abundance – 24.1%), ²⁰⁷Pb (abundance – 22.1%) and ²⁰⁸Pb (abundance – 52.4%). Calculate the Aᵣ of lead. Answer to 2 decimal places.

#30. What is the chemical symbol for chlorine?

#31. The diagram shows a solenoid. Why is the magnetic field stronger along the centre of the coil than on the outside? ? Select two answers

Select all that apply:

The fields cancel out to give a weaker field on the outside

The fields on the inside are stronger due to the nanoelectric effects of electromagnetic induction

The fields of the outside are weaker due to the greater potential difference at the centre of the wires in the coil

The fields add together in the centre and become nearly uniform and strong

#32. Why is catalysis by enzymes important for life processes?

It speeds up and facilitates chemical reactions

It slows down and prevents negative chemical reactions

#33. What is the name of the chemicals that we use to transmit messages through the blood to organs?

#34. What is the function of a cell?

gives power to a circuit

safety component which can break a faulty circuit

allows current to only flow one way

makes or breaks a circuit

two or more cells in a circuit

measures potential difference

releases light

provides variable resistance

measures current

provides a constant resistance

#35. What wavelength of the electromagnetic spectrum is useful for thermal imaging?

visible light

infrared

gamma rays

x-rays

ultraviolet light

#36. Oxygen is in group 6 and fluorine is in group 7. How many fluorine atoms bond with one oxygen atom?

#37. What is groundwater?

water in clouds

water with ground in it

water stored as ice

water in rocks and soil

#38. Copper can be purified using electrolysis of copper sulfate solution. For this process we use the setup in the image below. Complete the half equation for the reaction at the anode. Cu → ….. + …..

Cu⁺ + e

SO₃²⁻ + 2e

Cu²⁺ + 2e

#39. Which of the following plants have a mutualistic relationship with nitrogen-fixing bacteria?

Select all that apply:

Beans

Tomatoes

Potatoes

Peas

#40. Why do plants need nitrogen?

Nitrogen is a key ingredient in photosynthesis

Nitrogen is one of the ingredients in cellulose which makes up their cell walls

They have compounds containing nitrogen in their DNA and in proteins

#41. How many chambers does the heart have?

4

2

1

3

#42. Will endothermic reactions continue if there is no energy input?

Yes, until reactants run out

No, even if there are still reactants

#43. Which of the following is an advantage of crude oil?

crude oil does not produce air pollution when burned

crude oil can be easily transported through pipes

crude oil does not produce greenhouse gases when burned

#44. The needles of plotting compasses are tiny magnets – they always point near the Earth’s North Pole – why is this?

the Earth has a magnetic core

magnets always point upwards

the Earth is round

#45. Can Rf values be higher than 1?

Yes

Under certain conditions

No

#46. Neutralisation reactions which occur between an acid and a base are always:

Exothermic

Endothermic

#47. Which square instrument do we use for randomly sampling population sizes?

#48. What is the charge of a neutron?

-1

+1

0

#49. Which of the following are problems that would arise from measuring an extremely slow rate of reaction?

Select all that apply:

Very slow changes require long-term experiments - costly and may exceed human lifetimes

Extremely slow reactions do not always follow the law of conservation of energy

Very small changes are difficult to accurately measure

#50. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?

Leftovers

Residue

Remainder

#51. What is the name of the phase change from solid to gas?

sublimation

deposition

evaporation/boiling

condensation

melting

freezing

#52. Which electrode would the ion Mg²⁺ migrate to during electrolysis?

Anode

Cathode

Neither

#53. Is time a vector or a scalar?

scalar

vector

#54. Why is the rate of an enzyme controlled reaction highest at an optimum pH?

it is not different and there is no optimum

above and below the optimum the shape of the active site is changed

at high and low pH the substrates and enzymes repel each other

#55. Which of the following is a disadvantage of tidal energy generation?

salt-water is corrosive

the tides are predictable

there is not enough energy in the tides to produce electricity

#56. What does F represent in the equation for work done?

Energy

Distance

Force

Power

#57. How can we describe the motion of the object in this graph between 7 and 10 seconds?

Decelerating

Stationary

Accelerating

Moving at constant speed

#58. Calculate the relative formula mass of carbon monoxide (CO) to 2 decimal places. Carbon Aᵣ = 12, Oxygen Aᵣ = 16.

#59. Why is it dangerous to connect a live and earth wire?

The earth wire is connected to your neighbours and they will experience a power surge

A very large current will flow which could start a fire from excess heat

When unused the neutral wire will melt and cause a fire

#60. In a parallel circuit, is the potential difference across each branch –

Equal

Different

#61. Which of these are common properties of giant covalent materials?

Insoluble in water

Conduct electricity

Do not conduct electricity

Low melting/boiling points

Soluble in water

High melting/boiling points

#62. What is enzyme specificity?

describes the ability of an enzyme to catalyse only a particular reaction or set of reactions

the efficiency of an enzyme in catalysing reactions

the active site changes to fit with new substrates over its lifetime

#63. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?

More soluble - shorter distance

More soluble - greater distance

#64. In which part of the cell does anaerobic respiration take place?

Ribosomes

Mitochondria

Cytoplasm

#65. What is a battery?

makes or breaks a circuit

provides a constant resistance

two or more cells in a circuit

#66. When an impulse reaches an axon terminal what happens?

electricity jumps across the gap between neurones on to the next neurone

a neurotransmitter substance is released into the gap, which is detected by the next neurone

the signal is not passed on from axon terminals

#67. Which type of reaction is photosynthesis?

Ectothermic

Exothermic

Endothermic

#68. In which type of reaction would the temperature of a solution increase?

Ectothermic

Mesothermic

Exothermic

Endothermic

#69. Complete the sentence: In the UK the domestic electricity supply has a frequency of … Hz and is about ….. V.

10, 130

30, 230

50, 230

50, 25

#70. What are positrons?

an antimatter particle equivalent to an electron

two protons and two neutrons but no electrons

an electron

high frequency electromagnetic radiation

#71. The 5 kingdoms of life are Animals, Plants, Fungi, Protists and Prokaryotes. Which kingdom do algae belong to?

#72. True or false – microwave radiation at certain frequencies could cause the internal heating of cells in our bodies?

true

false

#73. Fresh water contains many different contaminants and so must be cleaned before it becomes potable. Which is the correct treatment path?

water from source --> chlorine added --> filtration tower --> sedimentation tank --> storage --> water pumped to homes

water from source --> sedimentation tank --> filtration tower --> chlorine added --> storage --> water pumped to homes

water from source --> filtration tower --> chlorine added --> water pumped to homes

#74. What type of substance is carbon dioxide (CO₂ )?

Mixture

Compound

Element

#75. Which of the following is the source of oil and gas?

dead plankton from millions of years ago

dead and buried plant material from millions of years ago

nuclear decay from millions of years ago

GCSE OCR Combined Science B Papers 1 and 5

Good Luck!

Results

#1. Which of the following descriptions best matches the hormonal system?

#2. In what part of the cells does aerobic respiration take place?

#3. Solutions of more than pH 7 are?

#4. What is the chemical symbol for sodium?

#5. In aqueous solutions such as sodium chloride solution, there will be positively charged ions from the salt (Na⁺) as well as hydrogen ions (H⁺). What is the rule that determines which will be discharged at the cathode.

#6. Which of the following are problems with using biofuels as a replacement for oil?

#7. What is the chemical symbol for potassium?

#8. Which form of radiation is most ionising?

#9. What state of matter has particles which are close together and vibrate around fixed positions?

#10. Why is magnesium a better electrical conductor than sodium?

#11. What is the function of a resistor?

#12. Which of the following are strong acids?

#13. Why is diamond hard?

#14. What is an alpha particle?

#15. Complete the equation: H⁺(aq) + OH⁻(aq) → ….

#16. Which form of radiation is least ionising?

#17. Where does blood from the aorta travel to?

#18. Which theory do we use to describe states of matter?

#19. Cobalt is a magnetic material – true or false?

#20. What is the resolution of electron microscopes limited by?

#21. Is natural gas renewable?

#22. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.

#23. Is acceleration a vector or a scalar?

#24. Copper can be purified using electrolysis of copper sulfate solution. For this process we use the setup in the image below. Complete the half equation for the reaction at the cathode. Cu²⁺ + 2e →

#25. What is induced magnetism?

#26. What is an isotope?

#27. What is the role of starch synthase?

#28. By which process does water in the oceans and lakes move into the atmosphere?

#29. Lead has 4 stable isotopes. ²⁰⁴Pb (abundance – 1.4%), ²⁰⁵Pb (abundance – 24.1%), ²⁰⁷Pb (abundance – 22.1%) and ²⁰⁸Pb (abundance – 52.4%). Calculate the Aᵣ of lead. Answer to 2 decimal places.

#30. What is the chemical symbol for chlorine?

#31. The diagram shows a solenoid. Why is the magnetic field stronger along the centre of the coil than on the outside? ? Select two answers

#32. Why is catalysis by enzymes important for life processes?

#33. What is the name of the chemicals that we use to transmit messages through the blood to organs?

#34. What is the function of a cell?

#35. What wavelength of the electromagnetic spectrum is useful for thermal imaging?

#36. Oxygen is in group 6 and fluorine is in group 7. How many fluorine atoms bond with one oxygen atom?

#37. What is groundwater?

#38. Copper can be purified using electrolysis of copper sulfate solution. For this process we use the setup in the image below. Complete the half equation for the reaction at the anode. Cu → ….. + …..

#39. Which of the following plants have a mutualistic relationship with nitrogen-fixing bacteria?

#40. Why do plants need nitrogen?

#41. How many chambers does the heart have?

#42. Will endothermic reactions continue if there is no energy input?

#43. Which of the following is an advantage of crude oil?

#44. The needles of plotting compasses are tiny magnets – they always point near the Earth’s North Pole – why is this?

#45. Can Rf values be higher than 1?

#46. Neutralisation reactions which occur between an acid and a base are always:

#47. Which square instrument do we use for randomly sampling population sizes?

#48. What is the charge of a neutron?

#49. Which of the following are problems that would arise from measuring an extremely slow rate of reaction?

#50. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?

#51. What is the name of the phase change from solid to gas?

#52. Which electrode would the ion Mg²⁺ migrate to during electrolysis?

#53. Is time a vector or a scalar?

#54. Why is the rate of an enzyme controlled reaction highest at an optimum pH?

#55. Which of the following is a disadvantage of tidal energy generation?

#56. What does F represent in the equation for work done?

#57. How can we describe the motion of the object in this graph between 7 and 10 seconds?

#58. Calculate the relative formula mass of carbon monoxide (CO) to 2 decimal places. Carbon Aᵣ = 12, Oxygen Aᵣ = 16.

#59. Why is it dangerous to connect a live and earth wire?

#60. In a parallel circuit, is the potential difference across each branch –

#61. Which of these are common properties of giant covalent materials?

#62. What is enzyme specificity?

#63. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?

#64. In which part of the cell does anaerobic respiration take place?

#65. What is a battery?

#66. When an impulse reaches an axon terminal what happens?

#67. Which type of reaction is photosynthesis?

#68. In which type of reaction would the temperature of a solution increase?

#69. Complete the sentence: In the UK the domestic electricity supply has a frequency of … Hz and is about ….. V.

#70. What are positrons?

#71. The 5 kingdoms of life are Animals, Plants, Fungi, Protists and Prokaryotes. Which kingdom do algae belong to?

#72. True or false – microwave radiation at certain frequencies could cause the internal heating of cells in our bodies?

#73. Fresh water contains many different contaminants and so must be cleaned before it becomes potable. Which is the correct treatment path?

#74. What type of substance is carbon dioxide (CO₂ )?

#75. Which of the following is the source of oil and gas?

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