# 1เลือกประเภท
work is measured in the unit known as what?
newton
watt
joule
calorie
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# 2เลือกประเภท
in which situation ,is work not done?
a worker lifted a bag up to the second floor.
a tow car pulled a car along the road.
a worker carried a bag and walked for 5m.
a man rowed his boat on a river
# 3เลือกประเภท
what class lever is an wheel barrow?
first
second
third
front
# 4เลือกประเภท
picture show a ball rolling down a smooth inclined plane,which form of energy in the ball will deceased?
potential energy
sound energy
kinetic energy
chemical energy
# 5เลือกประเภท
when a ball rolls down a slope,what conversion of energy takes place?
potential energy > kinetic energy
chemical energy > kinetic energy
kinetic energy > sound energy
kinetic energy > potential energy
# 6เลือกประเภท
how long does it take to pull a box weighing 200 N through a displacement of 5 m if the power generated is 100 W
0 s
2 s
5 s
10 s
# 7เลือกประเภท
A piano is 5 m away from Toya . Akito pushes the piano to Toya with with a force of 50 N.Now the piano is 2 M away from Toya,what is the work done by Akito??
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50 J
150 J
100 J
500 J
# 8เลือกประเภท
which of the following item does not convert electrical energy to heat energy?
electric iron
electric fan
electric toaster
electric bulb
# 9เลือกประเภท
what simple machine in the following is ued on a flagpole to help raise a flag?
inclined plane
lever
pulley
wheel and axle
# 10เลือกประเภท
which of the following contains elastric potential energy?
flowing water in a river
a compressed spring
a lighted electric bulb
fossil fuels
# 11เลือกประเภท
what is not true about surface water?
it is the water that collects on the surface of the earth.
it is the water that collects in the zone of the saturation.
it is very important as it sustains all the living things on land.
it comes from precipitation and also groundwater
# 12เลือกประเภท
which waterbody holds the greatest amount of water besides the oceans?
atmosphere
glaciers
groundwater
streams
# 13เลือกประเภท
which describes runoff the best?
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the rainwater that falls into the ocean.
the rainwater that seeps into the ground.
the rainwater that drains into the water.
the excess rainwater that is not absorbed by surrounding.
# 14เลือกประเภท
what is not the way to conserve water
washing loads of clothes in washing machine.
using bathtubs instead of shower for bathing.
collecting rainwater to watering plants.
fixing dropping faucets.
# 15เลือกประเภท
what is noit a possible cause of landslide?
drought
deforestation
earthquake
heavy downpour
# 16เลือกประเภท
what is the boundary between the zone of aeration and zone of saturation called?
water table
run off
surface water
porosity
# 17เลือกประเภท
what makes the surface water flood.
holes that formed in the ground collapse because it is extracted over a long period of time.
runoff can't drain away.
the rainwater,runoff and river combine because the ground can't hold this much water.
ground sink.
# 18เลือกประเภท
what is soil erosion?
a natural process on how soil is formed.
a process that involves the removal and transport of soil by wind and water.
a natural method of filtering harmful pollutants.
poison in plants.
# 19เลือกประเภท
what is a way to reduce soil erosion.
till the soil often.
cover soil with plenty of plants.
overgraze the lands.
increase the use of pesticides
# 20เลือกประเภท
what happens when the groundwater is extracted over a long period of time.
it will collapse (like me hj/)
it may dry up
landslide.
land will get dry
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