IS online_test_unit04a
--1--
When of the following object have increasing potential energy?
(1)A lift going upwards
(2)A balloon being blown up
(3)A monkey climbing up a tree
A.(1) and (2) only
B.(1) and (3) only
C.(2) and (3) only
D.(1), (2) and (3)
--2--
When would you have the most kinetic energy?
A.sitting on a chair
B.walking on a road
C.walking up a stair
D. running on a track
--3--
What is the energy change when a train is slowing down?
A.kinetic energy sound energy
B.kinetic energy potential energy
C.kinetic energy heat energy + sound energy
D.potential energy sound energy heat energy
--4--
Which of the following energy change takes place in the above power station?
(1)potential energy of water kinetic energy of water
(2)kinetic energy of water electrical energy
(3)heat energy electrical energy
A.(2) only
B.(3) only
C.(1) and (2) only
D.(2) and (3) only
--5--
Your friend is ringing your door bell. What is the energy change taking place in the door bell?
A.kinetic energysound energy
B.potential energy kinetic energy sound energy
C.sound energy electrical energy
D.electrical energy sound energy
--6--
A boy stretches a rubber band and then releases it. Which of the following best describe the energy changes involved?
A.chemical energy potential energy kinetic energy
B.potential energy chemical energy kinetic energy
C.heat energy potential energy kinetic energy
D.kinetic energy potential energy sound energy
--7--
Which of the following changes chemical energy to heat energy?
A.electric heater
B.light bulb
C.gas stove
D.solar cooker
--8--
In which of the following cases is potential energy changed to kinetic energy?
A.an aeroplane taking off
B.a stone rolling down a slope
C.a man walking up a stair
D.a man kicking a football
--9--
Which of the following are uncontrolled energy conversions?
(1)landslide
(2)bomb explosion
(3)hill fire
A.(1) and (2) only
B.(1) and (3) only
C.(2) and (3) only
D.(1), (2) and (3)
--10--
Which of the following is/are the use(s) of kerosene?
(1)Generation of electricity
(2)Fuels for cars
(3)Fuels for aeroplanes
A.(1) only
B.(3) only
C.(1) and (2) only
D.(2) and (3) only
--11--
Which of the following are fossil fuels?
(1)wood
(2)coal
(3)crude oil
A.(1) and (2) only
B.(1) and (3) only
C.(2) and (3) only
D.(1), (2) and (3)
--12--
Nowadays, the most common fuels used at homes in Hong Kong are
A.LPG and town gas
B.kerosene and LPG
C.petrol and town gas
D.kerosene and town gas
--13--
Susan is cooking soup as shown. What potential dangers can you see in her kitchen?
(1)The windows should be closed completely so that the cooking flame will not be blown out by wind.
(2)She should not leave the cooking flame unattended.
(3)She should not put flammable substances near the cooking flame.
A.(1) only
B.(1) and (3) only
C.(2) and (3) only
D.(1), (2) and (3) only
--14--
Which of the following is a renewable energy source?
A.coal
B.crude oil
C.solar power
D.nuclear power
--15--
Alcohol produces less air pollution than petrol. However, it is not commonly used as fuels for car. This is because
A.alcohol is difficult to burn.
B.alcohol is expensive.
C.alcohol is difficult to transport.
D.alcohol contains little energy.
--16--
Which of the following is the cause of global warming?
A.greenhouse gases
B.acid rain
C.geothermal power stations
D.nuclear power stations
--17--
In a geothermal power station, what energy source is used to generate electricity?
A.tides
B.underground hot rocks
C.nuclear fuels
D.wind
--18--
In Hong Kong, most of the electricity used is generated by
- nuclear power station.
B.burning of fossil fuels.
C.wind turbine.
D.solar power station.
--19--
Which of the following is the world’s main energy source nowadays?
A.nuclear power
B.fossil fuels.
C.solar power
D.hydro-electric power
--20--
Energy saving is important because
(1)the world’s energy sources are running out.
(2)it helps to reduce pollution problems indirectly.
(3)it helps to solve the problem of global warming indirectly.
A.(1) only
B.(1) and (2) only
C.(2) and (3) only
D.(1), (2) and (3)