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WorksheetsP4 - Exercise for Test 2
Total questions: 70
Worksheet time: 23mins
[BV] Energy is the ability to do _ _ _ _
(a)
P53, What forms of energy do we have when we move?
_ _ _ _ _ _ _.
(a)
[FB] Force is measured in _ _ _ _ _ _.
(a)
Energy is measured in _ _ _ _ _ _.
Joule
Mole
Ampere
Newton
Kelvin
Energy cannot be created or destroyed.
true
false
Energy can only be _____________ from one form to another form.
destroyed
examined
created
identified
transformed
we use these tools to transform electrical energy to heat energy:
iron
hairdryer
water heater
oven
microwave
Total energy in this universe is limited/unlimited?
limited
unlimited
Some energy may be depleted if they are used up at a rate faster than they are formed, like:
coal
wind
oil
The Sun
natural gas
P53, The main source of light energy is the (a)
Light wave can travel in vacuum.
true
false
[FB] Sun light can travel in vacuum at a speed of _________ km/s
300
3000
300.000
3.000.000
300.000.000
The light wave can travel constantly around 300.000 Km/s
true
false
The light wave can travel constantly around 300.000 Km/s in vacuum, but in water its travel only _________ km/s
200.000
225.000
125.000
75.000
The eyes of cats appear glow in the dark because they give off light.
true
false
The eyes of cats appear glow in the dark because in the dark their eyes __________ to allow more light to enter their eyes.
glow
shine
blink
shrink
dilate
A special layer behind the ____________of a cat that causes their eyes glow in the dark.
cornea
lens
pupil
iris
retina
A special layer behind the retina of a cat that causes their eyes glow in the dark is called ______________
tapetum lucidum
tape lucu
petum cidum
tapetium lucidium
What might happen if the sun never rises again?
The Earth will be a cold place.
The Earth will be a secret place.
Plants cant make food
We cannot dry our clothes
The Earth will be a dark place.
[SV] These animals can hear ultrasound that we cannot hear:
rhino
dogs
bat
dolphin
elephant
We are unable to hear sounds when we are in the water.
true
false
Sound travels faster in air than in solids because air provides less obstruction.
true
false
We hear the sound of thunder after we see it because (a) travel faster than sound in air.
[FB] Batteries contains _ _ _ _ _ _ _ _ energy.
(a)
A stationary objects does not have kinetic energy.
true
false
A stationary objects does not have kinetic energy because it is not _ _ _ _ _ _
(a)
[BV]
Potential Energy + __________ Energy = Mechanical Energy.
heat
chemical
sound
light
kinetic
A stationary objects does not have kinetic energy. Only moving objects have energy.
true
false
P64, A stationary objects can have (a) energy.
P64, The examples of gravitational energy!
Water that is behind a dam.
A raised weight
A yoyo before it is released.
A book on a table before it falls
Ripe fruit before it falls.
[U17] What energy does phosphorus belong to?
[Show: Secret package]
powder
light
kinetic
food
potential
P71 How does light travel?
Zig Zag Line
wave line
penetrating line
strict line
straight line
P71, Light travel in a straight line so,
Light has the same reflection on any surface.
true
false
P71, A_________ surface reflects light in the same direction.
jagged
rough
smooth
slimy
dull
P71, A r_ _ _ _ surface reflects light in the different directions.
(a)
P72, The properties of light are:
can be dispersed
can be diffracted
can be refracted
can be reflected
travel in straight line
We usually reflect light using _ _ _ _ _
(a)
We usually refract light using _ _ _ _ _
(a)
We can diffract light using _ _
(a)
We usually see dispersed sun light in the sky as _ _ _ _ _ _ _
(a)
P73, i use chemicals in my body to produce light.
i am _ _ _ _ _ _ _.
(a)
P73, Production of light by living things as a result of chemical reactions is called _________________
Bioluminouscence
Bioluminascence
Bioluminiscence
Bioluminescence
Bioluminescience
Dull surfaces still reflect light in different ways.
true
false
Why some things look shiny, some look dull?
because their _ _ _ _ _ _ _ are different.
(a)
P76, a (a) allows us to see objects that cannot be seen directly from where we are.
[SV] P76, Periscope usually used by (a) under the sea to see objects above the sea.
[BV] if light cannot penetrate the object then it is called an (a) object
[BV] if some light can still penetrate the object then it is called an (a) object
[BV] if most light can penetrate the object so we can see the object inside it clearly then it is called an (a) object
P78, We can not see the Sun at night, so there are no shadows at night!
true
false
P.78 What affects the shapes and size of shadows?
The (a) of the object and the light source.
[SV] Humans are bioluminescent.
true
false
[BV] what can be the causes of forest fires?
Lightning
Heat
dryness
cigarette
firefly
P81, Some materials that catch fire easily are called (a) materials.
One way of handle flammable materials is to keep them away from _ _ _ _ sources
(a)
Heat can change the _________ of an object.
temperature
size
color
state
texture
Only naked flames can burn flammable liquid/gas.
true
false
Flammable liquid/gas can burn when in contact with a static spark from f_ _ _ _ _ _ n.
(a)
The Science formula to create Fire is .....
Air
Heat
Oxygen
Fuel
Inflammable material
The best way to extinguish fire is just remove the heat from formula with water.
true
false
Always extinguish fire by removing heat from formula with water, in some case, is dangerous if it caused by e_ _ _ _ _ _ _ _ _y
(a)
Correct ways to put out an ELECTRICAL FIRE are:
Use baking soda
Use a fire extinguisher
Use a heavy blanket
Use water
Use sand
A sandbox at the gas station is used to extinguish fire by removing (a) from fire formula.
This product can extinguish fire because it contains CO2 to remove (a) from fire formula.
We can remove heat from fire formula by using (a)
Heat cannot be destroyed.
true
false
Heat cannot be destroyed. As an object loses heat, its surroundings is gaining that heat, till both reach the same t_ _ _ _ _ _ _ _ _ e.
(a)
P86, What do we use to measure temperature?
t_ _ _ _ _ _ _ _ _ _
(a)
If there are not enough gaps, expansion in the rail causes it to bend sideways. That will result in train (a) .
P91[Exp], A hot air balloon float in the air, cause it contains h_ _ _ _ d air
(a)
