Share Grade7-Semester 2- Revision
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Smooth surfaces _______ a lot of light.
reflect
why do we see objects as white?
They reflect all light
Another name for light bending is ....
refraction
If you are wearing a yellow shirt, what is true of the light that strikes it?
yellow colour is reflected, everything else is absorbed.
If you are wearing a black sweatshirt, what happens to most of the light that strikes the sweatshirt
is it absorbed
When a ray of light moves from the air to water it bends due to a change in
speed
When light passess through this object, it is refracted off of one wall and reflected to another, the light is refracted again and as it leaves the object, it forms a rainbow. What is this object?
prism
A type of magnet that has temporary magnetic effect when electric current flows through it.
electromagnet
The pattern of magnetic field depends on the shape of conductor.
True
The pattern of magnetic field produced is not affected by the direction of the current that flows in the conductor.- True or False
True
Increasing the batteries increases the strength of an electromagnet-True or False
True
ways to increase the strength of an electromagnet
increasing the number of coils around the nail, increasing the number of batteries, making the core bigger.
Which is not essential in a balanced diet normally?
Any junk food
Which nutrient provides the most amount of energy per gram?- carbohydrate/ fats/ protein/vitamin
Fat
You consume 2 servings of ice cream, how many calories are you consuming? *150 calories per serving
300
Eating liver is a great source of____________ which helps the body produce red blood cells to carry Oxygen
Iron
