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Grade 8 EASE 2 REVIEW
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A liquid can change state without boiling. After it rains, the puddles dry up even though the temperature is much lower than 100 C. The liquid water has become a gas called water vapour in the air. This is the process of ....
evaporation
The diagram shows the cross-section of a vacuum flask containing hot liquid in a cold room. X and Y are points on the inside surfaces of the walls of the flask. How is thermal energy transferred between X and Y?
Radiation Only
which methods of heat transfer that doesn't need any particle to transfer its heat?
raidation
what are the three methods of heat transfers?
conduction, convection, and radiation
Heat flows from _____ temperature to _____ temperature
higher to lower
This application of Air Conditioner, used the concept of heat transfer process in...
convection
from the picture, which type of liquid has highest density?
honey
what is the equation to calculate density?
mass/volume
What are two ways making stronger electromagnet:
Make a coil with more turns of wire. and Make a bigger electric current flow in the coil of wire.
When we take a metal rod with our fingers then burn to the fire, after a few seconds we fell hot, this is an example of which process of heat transfer?
conduction
Iron with some pin are putted like this picture. Which pin will fall first?
the closest pin to the heat sources
A students wants to make an electromagnetic that acts like a permanent magnet, what are some easy-to-find materials that they need to?.
iron, coil wire, battery
What are the magnetic materials in the earth's core that can create the earth's magnetic field?
Iron and Nickel
what is the piece of equipment that is used for navigation using Earth's magnetic field?
compass
What are the example of magnetic materials?
Iron, Cobalt, Nickel
What is the correct direction of the magnetic lines of force?
acts outwards from the north-pole of a magnet and inwards at the south-pole
What will happen when these magnets are brought close together?
They will repel each other.


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