Which of the following is NOT a common place to find water?
Oceans
Lakes
Deserts
Rivers
When water changes from liquid to a gas, this is called...
Condensation
Evaporation
Precipitation
Sublimination
What state is most of Earth's water in?
Solid (Ice)
Gas
Plasma
Liquid
Which is NOT a form of precipitation?
Snow
Rain
Runoff
Hail
What color is water vapor?
White
Blue
Invisible
Green
Untreated water is called_______ _________, which contains many _________and micro organisms.
________ makes up about 60% of our body weight and about 90% of our blood.
Removing impurities form water is called __________ _________.
Sedimentation is the simplest method for purifying water.
Sedimentation can remove insoluble and soluble impurities.
The solid material remaining on the filter is residue.
Filtration cannot remove insoluble impurities and most micro organisms in water.
matching
distillation
filtration
sedimentation
Sand is an example of ____________.
soluble impurities
micro-organisms
insoluble impurities
liquids
Which of the following is NOT a method of water purification?
sedimentation
filtration
distillation
fluoridation
Filtration can remove ______________ in reservoir water.
dissolved particles
micro-organisms
small insoluble substances
D.soluble impurities
The liquid collected from distillation is called the ______________.
residue
sediment
filtrate
distillate
Which of the following statements about chlorine is INCORRECT?
Chlorine can sterilise water
Chlorine gas can protect our teeth
Chlorine gas can make our eyes uncomfortable
Chlorinated water is safe to drink
Which of the following is the safest to drink?
Filtered water
Water after sedimentation
Distilled water
Rainwater
Ivy has just mopped the floor. What should she do to make the floor dry as soon as possible?
Turn on the light
Turn on the television
Turn on the computer
Turn on the fan
What is the most effective way to dry the clothes?
Fold the clothes first and hang them under the sun
Fold the clothes first and hang them in the bathroom
Unfold the clothes first and hang them under the sun
Unfold the clothes first and hang them in the bathroom
Which of the following is the correct sequence of the water cycle?
Evaporation-Condensation-Cloud formation-Raining
Condensation-Raining-Evaporation-Cloud formation
Evaporation - Raining-Condensation-Cloud formation
Cloud formation-Raining-Condensation-Evaporation
Which of the following can be explained by condensation of water?
Water droplets disappear on a wet umbrella.
A wet cloth becomes dry.
We feel cool after sweating.
Dew is formed on a leaf’s surface.
Match the sources of pollutant with the types of pollutant
Homes
sewage from dish washing
Factories
chemicals from dyeing process
Farms
animal faeces
Ships
oil spill
If the humidity is high, the rate of evaporation will be fast.
A metal rod is heated strongly and its length is 30 cm. After it is cooled down, its length is likely to be __________.
29cm
31cm
30cm
20cm
Which of the following is the unit for measuring gas pressure?
Pascal
kilogram
meter
Bourdon
Matter expands on heating because _______________________.
the particles become larger
the spaces between the particles become larger
the particles become smaller
the spaces between the particles become smaller
In which substance are the particles closely arranged in a regular pattern at room temperature?
Oxygen
Gold
Water
Sugar solution
The boiling point of a substance X is 78oC. When X is stored in a container at 90 oC, which state of matter is it in?
Gas
Liquid
Solid
Cannot be determined
Which of the following about gases is INCORRECT?
It has a fixed shape.
It has no fixed volume.
It can change into liquid.
It is a state of matter.
Which of the following statements about a smoke cell is correct?
Inside a smoke cell,the air particles do not hit each other
Under a microscope,the air particles inside a smoke cell appear as bright spots
Inside a smoke cell,the smoke particles do not hit each other
The air particles are much smaller than the smoke particles
Which substance is a gas at room temperature?
Oxygen
Gold
Water
Salt
Which of the following does NOT involve the change of states of matter?
Clothes dry up very quickly on a sunny day.
Dews form on leaves in the morning.
A basketball ball is pumped up.
Ice form in the refrigerator.
Water becomes ice at the ___________ point and becomes steam at the ___________ point.
The random movement of the dust in the air is an example of ___________ ___________.
The particles in a ___________ only vibrate about a fixed position.
The continuous hitting of air particles on an object exerts a pressure called the ___________ ___________.
Lighting up a light bulb in a closed container will increase the gas pressure inside.
Gas particles can only vibrate at a fixed position.
Perfume particles spread in all directions in the air.
The air pressure increases as we climb up a high mountain.
The gaps in a rail are to prevent the rail from curling up as it expands in hot summer.
Gases expand more than liquids on heating.
The density of cold air is higher than that of warm air.
Match the apparatus with the function.
Bourdon Gauge
To measure the air pressure in a basketball
Mercury thermometer
To measure the temperature of boiling water
Magdeburg hemispheres
To show the power of air pressure
Smoke cell
To observe the movement of smoke particles
Stretched or raised objects have ____________energy.
________energy enables us to see things.
A moving object has _________energy.
________energy can increase the temperature of an object.
An ________ ________can convert energy from one form into another.
LPG is produced form _______ ______.
The heat energy form the burning fuels is used to boil water to steam.The steam then drives a _________,which in turn drives a generator to produce electricity.
Generation of electricity produces sulphur dioxide and nitrogen oxides which cause_________ ________.
Lamps change all the electrical energy into light energy.
The explosion of an atomic bomb is an example of uncontrolled energy conversion.
Natural gas dissolves in rain to form acid rain.
The chemical energy stored in water is changed to electricity in hhydro-electrical power stations.
Coal is an ideal fuel because it is cheap.
In an energy converter, the energy conversion can only take place in one direction.
Which of the following is an uncontrolled energy change?
Adjusting the volume of a radio
Cooking on a gas stove
Driving a vehicle
Explosion of an LPG container
Which of the following are fuels extracted from oil?(I) Petrol (II) Kerosene(III) LPG
(I) and (II) only
(II) and (III) only
(I) and (III) only
(I), (II) and (III)
Which of the following is NOT allowed at a gas station?
Talking
Eating
Walking
Smoking
Which of the following is NOT a renewable energy source?
Natural gas
Solar power
Wind power
Geothermal power
Which of the following is a advantage of using nuclear power to generate electricity?
It may release dangerous radiation.
The nuclear waste must be carefully handled.
It can generate extremely large amount of electricity.
The radiation leaked may harm several generations of living things.
Which of the following is NOT a result of burning fuels in power stations?
Sulphur dioxide is released.
Dangerous radiation is produced.
Carbon dioxide is released.
Electricity is generated.
Which of the following is NOT a property of a good fuel?
Easy to transport
Releasing a lot of harmful substances
Easy to store
Abundant in nature and easy to obtain
Which of the following is NOT a safety rule for using gas fuels?
Repair a gas stove by ourselves.
Do not allow children playing in the kitchen.
Turn off the gas supply after using a gas stove.
Open the windows when using a gas stove.
Which fuel is used in the power stations in H ng Kong to generate electricity?
Town gas
Coal
Kerosene
Uranium
Matching
wind power station
hydro-electrical power station
solar power station
geothermal power station