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WorksheetsSains form 3 revision (2)
Total questions: 49
Worksheet time: 34mins
The position of a metal in the reactivity series of metals depends on the reactivity of the metal when reacting with ....
Carbon
Hydrogen
Oxygen
Sulphur
Aluminium is more reactive than ....
Calcium and Zinc
Sodium and Gold
Magnesium and Copper
Lead and Iron
Based on the following diagram, what is the function of potassium manganate (VII) crystals in this experiment?
To supply oxygen
To avoid the metals to mix with each other
To release heat
To give out water vapour
Complete the word equation below.
Magnesium + oxygen --> .....
Magnesium
Magnesium oxide
Oxides
Magnesium oxide + water
Hydrogen is more reactive than the following metals except .....
Lead
Copper
Aluminium
Mercury
Choose the correct sequence.
.............. , ............ , .........
----------------------------------->
Reactivity towards oxygen increases
Silver , Copper , Tin
Iron , Lead , Mercury
Magnesium , Aluminium , Calcium
Iron , Carbon , Lead
In an endothermic reaction, energy is _________.
absorbed
released
_____ reactions usually feel hot!
endothermic
exothermic
10. Which of the following are examples of an exothermic reaction?
Cooking an egg
Plants making sugar through photosynthesis
Dynamite exploding
A toaster, rated 1500 W 240 V, is switched on for 15 minutes. Calculate the energy used.
3600 J
22 500 J
216 000 J
1 350 000 J
An air-con, rated 1.8 kW 240 V, is switched on for 10 minutes. Calculate the energy used.
1 080 000 J
144 000 J
2400 J
18 J
The electrical energy used by a fan for 4 minutes is 170 kJ. Calculate the power of this fan in W.
42.5
42500
708
0.708
An oven rated 750 W, 220 V is switched on for 45 minutes. Calculate the cost of energy that is used by the oven if the cost per 1 unit is 30 sen?
3 sen
17 sen
16875 sen
4 sen
A man is pulling on a 7kg box with a force of 150N. There is a frictional force of 100N (backwards) acting as well.
What is the net force acting on the box?
100 N
250 N
50 N
150 N
Force is measured in.....
kg, mg or g
m/s 2
m/s
N
Radioactive dating uses the half-life of different radioactive materials to provide information about the _______ of a sample.
purity
age
radioactivity
nuclear stability
Which of these is a use of beta radiation?
Sterilising food
Smoke detectors
Monitoring metal sheet thickness
Industrial tracers
Which is an example of man made radiation?
Cosmic
Radioactive decay
Radon
Nuclear power plant
which form of radiation is stopped by aluminium but not paper?
Alpha
Beta
Gamma
Which one of these are NOT the importance of the Earth’s magnetosphere?
Protect life on Earth from the adverse effects of solar wind.
Reduces the pressure exerted by solar wind on earth's atmosphere.
Block charged particles in the solar wind from reaching earth.
Attain the maximum brightness of solar flares.
What does the magnetosphere do?
It absorbs solar radiation from the Sun and helps us to navigate
It removes solar radiation from the Sun and helps us to navigate.
It deflects solar radiation from the Sun back out into space and helps us navigate.
Which of the following satellite is owned by Malaysia?
Antara satelit yang berikut, yang manakah dimiliki oleh Malaysia?
Lunar 2
Sputnik II
Tiung SAT1
Voskhod 2
Which of the following is used to launch space ships and satellites?
rocket
space probe
space station
telescope
Where do astronauts carry out research in space?
space ship
space station
space shuttle
space probe
Which statement describes the principles of conservation of energy?
Energy can be destroyed
Energy can created
Energy can change its form
Energy can retain its value
The Law of Conservation of Energy states:
Energy can created or destroyed but not transformed
Energy cannot be created or destroyed, it can only transformed
Energy can't be created, destroyed or transformed
Energy cannot be created or destroyed.
What are the inner layers of the Sun?
Core, Radiative zone, and Convection zone.
Crust, mantle, and core.
Core, Photosphere, and Radiative Zone.
The Sun doesn't have inner layers.
What are the outer layers of the Sun?
The Sun has only inner layers.
Photosphere, Chromosphere, and Corona.
Core, Radiative zone, and Convection zone.
Crest, Corona, Mantle.
Nuclear Fusion is when ________ atoms are squeezed together forming _________ atoms.
Hydrogen / Helium
Nitrogen / Hydrogen
Oxygen / Neon
Helium / Oxygen
Choose the step-up transformer
A
B
C
Namakan P. / Name P.
Rangkaian Grid Nasional / National Grid Network
Stesen transformer injak naik / Step-up transformer station
Pencawang utama / Main substation
Lapangan suis / Switch zone
Namakan Q. / Name Q.
Rangkaian Grid Nasional / National Grid Network
Stesen transformer injak naik / Step-up transformer station
Pencawang utama / Main substation
Lapangan suis / Switch zone
Namakan R. / Name R.
Rangkaian Grid Nasional / National Grid Network
Stesen transformer injak naik / Step-up transformer station
Pencawang utama / Main substation
Lapangan suis / Switch zone
Namakan S. / Name S.
Rangkaian Grid Nasional / National Grid Network
Stesen transformer injak naik / Step-up transformer station
Pencawang utama / Main substation
Lapangan suis / Switch zone
Merujuk kepada Rangkaian Grid Nasional, nilai voltan yang dihantar mengikut kawasan manakah benar?
Kawasan perumahan = 450 V
Bangunan komersial = 240 V
Industri ringan = 11 kV
Industri berat = 132 kV
Nyatakan jenis sistem pendawaian. / State the type of wiring system.
Pendawaian fasa tunggal / Single-phase wiring
Pendawaian tiga fasa / Three-phase wiring
Arus apakah yang dihasilkan oleh stesen jana kuasa?
What type of current produced at the power stations?
Arus ulang alik
Alternating curent
Arus terus
Direct current
Transformer apakah yang digunakan untuk menukarkan jumlah voltan arus ulang-alik dari 11kV atau 25kV yang dihasilkan di Stesen Jana Kuasa kepada 132kV, 275kV atau 500kV?
What type of transformers are used to increase the voltage value of alternating current from 11kV or 25kV that are produced at the power stations to 132kV, 275kV or 500kV?
Transformer injak naik
Step-up transformer
Transformer injak turun
Step-down transformer
Transformer ringkas
Simple transformer
Tiada transformer
No transformer
Voltan bagi arus ulang alik adalah paling tinggi di ____________
The voltage for the alternating current is the highest at ___________
stesen jana kuasa
power stations
Rangkaian Grid Nasional
National Grid Network
pencawang bahagian
branch substations
