5487213
Descripción
Test por ahidalgo.maldona, actualizado hace más de 1 año
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Creado por ahidalgo.maldona
hace más de 8 años
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Pregunta 1
Pregunta
Which part of a plant cell is formed from cellulose?
Respuesta
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cell surface membrane
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cell wall
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chloroplasts
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cytoplasm
Pregunta 2
Pregunta
An experiment is set up as shown.
After several hours, the water turns blue.
Which process causes this colour change to take place?
Respuesta
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absorption
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diffusion
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digestion
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evaporation
Pregunta 3
Pregunta
The enzyme catalase is found in liver cells. A cube of boiled liver and a cube of raw liver are
added to solutions of hydrogen peroxide.
Which shows the result of this experiment?
Respuesta
Pregunta 4
Pregunta
Which two chemical substances are required for photosynthesis?
Respuesta
-
carbon dioxide and glucose
-
glucose and oxygen
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oxygen and water
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water and carbon dioxide
Pregunta 5
Pregunta
The blockage of which blood vessel causes a heart attack?
Respuesta
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aorta
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coronary artery
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pulmonary artery
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pulmonary vein
Pregunta 6
Pregunta
The flow chart shows a green leaf being tested for the presence of starch.
What are substances 1, 2, 3 and 4?
Respuesta
Pregunta 7
Pregunta
The diagram shows a section through the female reproductive system.
Where is the fertilised ovum implanted?
Respuesta
-
A
-
B
-
C
-
D
Pregunta 8
Pregunta
A potato is cut into two portions, X and Y. Both portions produce shoots that grow into new
plants.
Which statement about the two new plants is not true?
Respuesta
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They are clones.
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They come from different zygotes.
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They contain identical genes in each cell.
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They have the same parent.
Pregunta 9
Pregunta
The diagram shows a food web for a lake.
The diagram shows a food web for a lake.
Respuesta
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microscopic plants → tadpoles → small fish → large fish
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microscopic plants → insect larvae → water beetles → tadpoles
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microscopic plants → water snails → diving beetles → large fish
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microscopic plants → water snails → water weed → tadpoles
Pregunta 10
Pregunta
Which procedure would reduce soil erosion?
Respuesta
-
allowing large numbers of sheep to graze on grassland
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changing sloping farmland into terraced fields
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cutting down rainforests for agricultural use
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reducing the number of trees on hillsides
Pregunta 11
Pregunta
Which method of separation can be used to obtain pure water from aqueous potassium chloride?
Respuesta
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chromatography
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crystallisation
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distillation
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filtration
Pregunta 12
Pregunta
Which diagrams correctly show the displayed formula of ammonia and of carbon dioxide?
Respuesta
Pregunta 13
Pregunta
Which metal reacts dangerously when added to dilute sulphuric acid?
Respuesta
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copper
-
magnesium
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sodium
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zinc
Pregunta 14
Pregunta
The diagram shows a razor used in shaving.
Why is the razor made of stainless steel and not pure iron?
Respuesta
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It is a compound but iron is an element.
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It is easier to polish than is iron.
-
It is more brittle than iron.
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It is more resistant to rusting than is iron.
Pregunta 15
Pregunta
Some calcium carbonate and hydrochloric acid start to react. Water is then added to the reaction
mixture.
What happens to the speed of the reaction?
Respuesta
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It decreases.
-
It increases.
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It stays the same.
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It stops.
Pregunta 16
Pregunta
The apparatus shown is set up.
The crucible needs to be heated for the bulb to give out light.
Why is heat needed?
Respuesta
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An exothermic reaction takes place in the crucible.
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Electrodes only conduct electricity when hot.
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Heat causes the lead(II) bromide to react with air.
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The lead(II) bromide has to be melted.
Pregunta 17
Pregunta
Why is water often used to extinguish fires?
Respuesta
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The boiling point of water is 100 °C .
-
Water is a compound containing oxygen and hydrogen.
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Water removes heat from the fire.
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Water reacts with most fuels.
Pregunta 18
Pregunta
Some liquid is heated in a flask.
The diagrams show the height of the liquid in the tube when the liquid is cold and when it is hot.
What is the difference in the heights?
Respuesta
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1.7 cm
-
2.8 cm
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3.2 cm
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4.5 cm
Pregunta 19
Pregunta
The speed-time graph shown is for a bus travelling between stops.
Where on the graph is the acceleration of the bus the greatest?
Respuesta
-
A
-
B
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C
-
D
Pregunta 20
Pregunta
The circuit of a motor racing track is 3 km in length. In a race, a car goes 25 times round the
circuit in 30 minutes.
What is the average speed of the car?
Respuesta
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75 km / hour
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90 km / hour
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150 km / hour
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750 km / hour
Pregunta 21
Pregunta
The diagram shows a transformer connected to a 240 V a.c. supply.
What is the potential difference across the secondary coil of the transformer?
Respuesta
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30 V
-
120 V
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240 V
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480 V
Pregunta 22
Pregunta
There are three types of emission from radioactive substances.
Which types carry an electric charge?
Respuesta
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alpha-particles and beta-particles only
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alpha-particles and gamma-rays only
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beta-particles and gamma-rays only
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all three types
Pregunta 23
Pregunta
The device X in this circuit is designed to cut off the electricity supply if too much current flows.
What is device X?
Respuesta
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a fuse
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a relay
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a resistor
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an ammeter
Pregunta 24
Pregunta
A heater is placed in a room.
Which diagram shows the movement of air as the room is heated?
Respuesta
Pregunta 25
Pregunta
The diagram shows an experiment to find the density of a liquid.
What is the density of the liquid?
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