OCR Combined Science B Papers 4 and 8 Automock

#1. The table shows 3 substances and their melting points. Which types of substances could Y be?

Select all that apply:

compound

element

mixture

#2. Is this statement correct? When measuring momentum, if two objects are travelling in opposite directions, one object will be given a negative momentum (e.g. – 250 kg m/s).

Yes

No

#3. What is the chemical symbol for fluorine?

#4. What is Newton’s Second Law of Motion?

objects in motion stay in motion and objects at rest stay at rest

every action has an equal and opposite reaction

F = MA

#5. What is this component?

#6. What wavelength of the electromagnetic spectrum is useful for cooking?

gamma rays

infrared

visible light

ultraviolet light

x-rays

#7. What is potential difference measured in?

Volts

Coulombs

Ohms

Amperes or Amps

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

Mitochondria

Chloroplasts

Cytoplasm

Ribosomes

#9. Fill in the blank – Thermal conductivity is the ability of a material to conduct or pass on heat through …….. with another material?

Contact

Radiation

Radioactive interactions

#10. True or false – plants remove carbon from the atmosphere during photosynthesis

true

false

#11. Which of the following are 3 of the adaptations of leaves for efficient photosynthesis?

Select all that apply:

Transparent epidermis - allows sunlight to travel straight into the leaves

Guard cells open and close the entrance to leaves from stems - isolates infected leaves

Chloroplasts migrate back into the stems overnight - protects them from cold weather

Guard cells open and close stomata - control water loss

Palisade layer filled with chloroplasts is just below the epidermis - maximising light intensity

#12. What is period?

the time taken for a full oscillation

how far from the equilibrium point the wave has oscillated

the distance of one entire oscillation

the number of waves passing a point each second

the maximum displacement of a wave

#13. 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

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

Anode

Cathode

Neither

#15. What is acceleration?

Change in the rate of velocity

Increase in distance

Change in the rate of displacement

#16. What is the role of lipase?

synthesises DNA from its monomers

synthesises starch from glucose

breaks down fats in the diet

breaks down hydrogen peroxide made during cell reactions

breaks down proteins in the diet

synthesises glycogen from glucose

breaks down starch to small sugars such as maltose

#17. What is the name of the process by which salt is removed from water?

desalination

unsaturation

demicronation

#18. Are ammeters connected in series or in parallel?

Series

Parallel

#19. Why did the concentration of carbon dioxide in the atmosphere decrease after the oceans formed?

Carbon dioxide escaped the atmosphere as the Earth's spin increased in speed, causing an increase the centrifugal force

Carbon dioxide was split by photolysis, producing pure carbon which rained down as a solid.

Carbon dioxide dissolved into the oceans and sea organisms used carbon in their shells as calcium carbonate

#20. Steel is a magnetic material – true or false?

true

false

#21. 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

#22. What is the chemical symbol for calcium?

#23. In transverse waves are the vibrations parallel or at right angles to the direction of wave travel?

parallel

right angles

#24. Which of the following is a disadvantage of nuclear fission?

it produces only small amounts of energy

it is not currently commercially viable

it is very complex and expensive

#25. The force on a conductor carrying current at right angles to a magnetic field is expressed by which of the following equations?

F = magnetic flux density / current x length

F = magnetic flux density x resistance x current

F = magnetic flux density x current x length

#26. Why is graphite softer than diamond?

Graphite is actually harder than diamond

Graphite is softer because the covalent bonds are weaker between atoms of carbon in graphite than in diamond

Graphite is arranged in sheets with weak intermolecular forces holding them together. These can easily slide, making graphite soft.

#27. We sometimes use a transect to perform systematic sampling. This involves which of the following?

Sampling every time your reach a predefined distance, such as every 5 metres

Sampling using a complex system of North, South, East and West samples combined with a random coin-flip to determine direction

Sampling at random

#28. How is fossil fuel usage changing as a percentage of total energy production worldwide?

staying the same

falling

rising

#29. Which of these is a problem with metallic models?

The model shows the atoms as being too far apart and there are no sticks

The model does not show that the ions will be constantly vibrating

They do not show how the structure formed and suggest that the electrons in different atoms are different, but they are actually the same

#30. 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 low energy density

they have high energy density

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

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

#31. What wavelength of the electromagnetic spectrum does a radiator glow at?

gamma rays

radiowaves

ultraviolet light

microwaves

visible light

x-rays

infrared

#32. Why are metals malleable?

Because metal ions constantly break and reform their bonds, allowing the shape to be moulded

Because the layers of metal slide across each other, rather than breaking the bonds between ions

Because metal atoms themselves are compressible and are moulded into shape

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

distillation

precipitation

condensation

evaporation

sublimation

#34. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?

Ectothermic

Endothermic

Mesothermic

Exothermic

#35. When using inert electrodes to perform electrolysis with water acidified with sulfuric acid, which products will be produced at the anode and cathode?

Cathode: Hydrogen (H₂) Anode: Hydroxide (OH⁻)

Cathode: Hydroxide (OH⁻) Anode: Hydrogen (H₂)

Cathode: Hydrogen (H₂) Anode: Sulfate (SO₄²⁻)

#36. What do we use fullerenes for?

nanoelectronics, delivery of medicines within the body and strengthening tennis racket frames

as fuel in high performance internal combustion engines and in electric car batteries

#37. What is graphene?

Graphene is a layer of graphite that is one atom thick

Graphene is the material that forms from the covalent bonding of oxygen and nitrogen

Graphene is a small section of a diamond

#38. Capillaries are only one cell thick and have thousands of branches. What is the function of capillaries?

Moving oxygenated blood towards the heart from the lungs

Exchanging molecules between the blood and other organs via diffusion

#39. What is this component?

#40. What wavelength of the electromagnetic spectrum is useful for communications?

x-rays

microwaves

visible light

ultraviolet light

infrared

#41. Why can humans only survive a few days without water?

most of our body is made of water and it is continually lost to the environment

without water our mouths become too dry to speak

water allows us to swallow our food

#42. What is Newton’s Third Law of Motion?

F = MA

objects in motion stay in motion and objects at rest stay at rest

every action has an equal and opposite reaction

#43. In which sub-cellular structure inside plant cells does photosynthesis occur?

#44. When using inert electrodes to perform electrolysis with molten lead bromide, which products will be produced at the anode and cathode?

Cathode: Lead (Pb) (s) Anode: Bromine (Br₂) (g)

Cathode: Bromine (Br₂) (g) Anode: Lead (Pb) (s)

Cathode: Hydrogen (H₂) (g) Anode: Lead (Pb) (s)

#45. Calculate the change in height of the tennis ball in the following scenario. A ball weighs 0.15kg – the change in GPE is 100 J – the gravitational field strength is 10N/kg. Answer to 1dp and include units. ? If you do not know the GPE equation, it is listed below the quiz

#46. True or False – Magnetic field lines are used to show how a single north pole would move from north to south?

false

true

#47. How can you reduce the effect of friction in the chain on a bicycle?

Insulation

Lubrication

Progestration

#48. Producers are organisms which do what?

Eat other organisms that produce glucose

Make glucose through photosynthesis

#49. Does increasing the pressure of gases increase the rate of reaction?

Yes

Sometimes

No

#50. What are enzymes?

proteins which act as biological catalysts

the movement of particles across a membrane against the concentration gradient

building blocks of the basic macromolecules of life

a molecule that is changed during a reaction

the process by which plant cells get longer/bigger

#51. What is the chemical symbol for silver?

#52. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?

Cathode: Hydrogen (H₂) Anode: Sulfate (SO₄²⁻)

Cathode: Sodium (Na) Anode: Hydroxide (OH⁻)

Cathode: Hydrogen (H₂) Anode: Hydroxide (OH⁻)

#53. Why does the rate of an enzyme controlled reaction increase with greater substrate concentration?

The rate of reaction does not increase

The rate of reaction increases because there are available active sites, so more reactions take place

The rate of reaction increases because higher substrate concentration leads to warmer temperatures

#54. What is the source of energy for the sun?

nuclear fission

hydrocarbons

nuclear fusion

#55. Is photosynthesis an endothermic or an exothermic reaction?

Exothermic - puts out energy

Endothermic - takes in energy

#56. Which of these descriptions best describes fullerenes?

Fullerenes are the same as simple molecular compounds

Fullerenes are tubes or balls of carbon atoms with each carbon covalently bonded to three other carbons.

Fullerenes are a group of extremely hard non-metal substances that are typically found deep underground.

#57. If a car is moving but the forces are balanced – what will happen to the speed of the car?

will stay constant

will accelerate

will decelerate

#58. What is the shortest wavelength of visible light

orange

blue

violet

red

indigo

green

yellow

#59. What is this component?

#60. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……

Select all that apply:

Electromagnetic waves

Electricity

Sound

Heat

#61. When there are more frequent collisions between particles, what will happen to the rate of reaction?

It will decrease

It will stay the same

It will increase

#62. How much of the atmosphere is composed of nitrogen?

approximately 80%

approximately 50%

approximately 10 %

#63. What is the definition of resolution?

The furthest away you can be from the eyepiece lens and still see a clear image

The largest distance between two points that can be distinguished as separate

The smallest distance between two points that can be distinguished as separate

#64. Calculate the acceleration of an object which has the following characteristics. Use the following equation v² − u² = 2 a x. Final velocity = 50m/s, Initial velocity 0m/s, Distance travelled = 350m

3.57 m/s²

25 m/s²

2.65 m/s²

1250 m/s²

Rearrange the equation to the following and then substitute in the correct values:

a = v² – u²

2 x

Where:

a = acceleration

v² = final velocity squared

u² = initial velocity squared

x = distance

#65. Complete the following equation describing a reaction with a metal carbonate and an acid: metal carbonate + acid → …. + …. + ….

Select all that apply:

ozone

water

carbon dioxide

salt

oxygen

#66. Surface area to volume ratio affects rate of reaction. Why is that the case?

With higher surface area to volume ratio, there is more surface where collisions can take place

With higher surface area to volume ratio, the overall temperature of reactants is lower, this leads to increased collision impact when struck

With lower surface area to volume ratio, objects are much hotter and travel faster

#67. Complete the following half equation for a reaction the cathode during electrolysis of molten lead bromide. Pb²⁺ + 2e → …..

Pb

Ld

2Pb

#68. Increases in thyroxine concentration in the blood cause a decrease in the amount of thyroxine released. What kind of feedback mechanism is this?

Negative feedback

Postive feedback

#69. Which form of radiation is least ionising?

alpha particles

gamma rays

beta particles

#70. Which of the following features are found in veins?

Thin flexible walls

Wide lumen (inside diameter of tube)

Narrow lumen (inside diameter of tube)

One cell thick walls

Thick elastic walls made from muscle fibres

#71. Which type of factor is nutrient availability?

Sub-biotic

Biotic

Abiotic

Inbiotic

#72. Which of the following best describes energy?

Energy is the force we use to measure how far things move

Energy is the rate at which electricity is transferred

Energy is the ability to do work - make things change

#73. Why did the amount of oxygen in the atmosphere increase over time?

Oxygen was released during the Great Oxidation Period from extensive volcanic activity

Oxygen present in the Earth's mantle, seeped out over time and escaped via deep ocean ridges

Plants and other organisms began to perform photosynthesis, producing oxygen gas

#74. What the the most dense state of matter?

plasma

gases

liquids

solids

GCSE OCR Combined Science B Papers 1 and 5

Good Luck!

Results

#1. The table shows 3 substances and their melting points. Which types of substances could Y be?

#2. Is this statement correct? When measuring momentum, if two objects are travelling in opposite directions, one object will be given a negative momentum (e.g. – 250 kg m/s).

#3. What is the chemical symbol for fluorine?

#4. What is Newton’s Second Law of Motion?

#5. What is this component?

#6. What wavelength of the electromagnetic spectrum is useful for cooking?

#7. What is potential difference measured in?

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

#9. Fill in the blank – Thermal conductivity is the ability of a material to conduct or pass on heat through …….. with another material?

#10. True or false – plants remove carbon from the atmosphere during photosynthesis

#11. Which of the following are 3 of the adaptations of leaves for efficient photosynthesis?

#12. What is period?

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

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

#15. What is acceleration?

#16. What is the role of lipase?

#17. What is the name of the process by which salt is removed from water?

#18. Are ammeters connected in series or in parallel?

#19. Why did the concentration of carbon dioxide in the atmosphere decrease after the oceans formed?

#20. Steel is a magnetic material – true or false?

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

#22. What is the chemical symbol for calcium?

#23. In transverse waves are the vibrations parallel or at right angles to the direction of wave travel?

#24. Which of the following is a disadvantage of nuclear fission?

#25. The force on a conductor carrying current at right angles to a magnetic field is expressed by which of the following equations?

#26. Why is graphite softer than diamond?

#27. We sometimes use a transect to perform systematic sampling. This involves which of the following?

#28. How is fossil fuel usage changing as a percentage of total energy production worldwide?

#29. Which of these is a problem with metallic models?

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

#31. What wavelength of the electromagnetic spectrum does a radiator glow at?

#32. Why are metals malleable?

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

#34. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?

#35. When using inert electrodes to perform electrolysis with water acidified with sulfuric acid, which products will be produced at the anode and cathode?

#36. What do we use fullerenes for?

#37. What is graphene?

#38. Capillaries are only one cell thick and have thousands of branches. What is the function of capillaries?

#39. What is this component?

#40. What wavelength of the electromagnetic spectrum is useful for communications?

#41. Why can humans only survive a few days without water?

#42. What is Newton’s Third Law of Motion?

#43. In which sub-cellular structure inside plant cells does photosynthesis occur?

#44. When using inert electrodes to perform electrolysis with molten lead bromide, which products will be produced at the anode and cathode?

#45. Calculate the change in height of the tennis ball in the following scenario. A ball weighs 0.15kg – the change in GPE is 100 J – the gravitational field strength is 10N/kg. Answer to 1dp and include units. ? If you do not know the GPE equation, it is listed below the quiz

#46. True or False – Magnetic field lines are used to show how a single north pole would move from north to south?

#47. How can you reduce the effect of friction in the chain on a bicycle?

#48. Producers are organisms which do what?

#49. Does increasing the pressure of gases increase the rate of reaction?

#50. What are enzymes?

#51. What is the chemical symbol for silver?

#52. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?

#53. Why does the rate of an enzyme controlled reaction increase with greater substrate concentration?

#54. What is the source of energy for the sun?

#55. Is photosynthesis an endothermic or an exothermic reaction?

#56. Which of these descriptions best describes fullerenes?

#57. If a car is moving but the forces are balanced – what will happen to the speed of the car?

#58. What is the shortest wavelength of visible light

#59. What is this component?

#60. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……

#61. When there are more frequent collisions between particles, what will happen to the rate of reaction?

#62. How much of the atmosphere is composed of nitrogen?

#63. What is the definition of resolution?

#64. Calculate the acceleration of an object which has the following characteristics. Use the following equation v² − u² = 2 a x. Final velocity = 50m/s, Initial velocity 0m/s, Distance travelled = 350m

#65. Complete the following equation describing a reaction with a metal carbonate and an acid: metal carbonate + acid → …. + …. + ….

#66. Surface area to volume ratio affects rate of reaction. Why is that the case?

#67. Complete the following half equation for a reaction the cathode during electrolysis of molten lead bromide. Pb²⁺ + 2e → …..

#68. Increases in thyroxine concentration in the blood cause a decrease in the amount of thyroxine released. What kind of feedback mechanism is this?

#69. Which form of radiation is least ionising?

#70. Which of the following features are found in veins?

#71. Which type of factor is nutrient availability?

#72. Which of the following best describes energy?

#73. Why did the amount of oxygen in the atmosphere increase over time?

#74. What the the most dense state of matter?

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

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