science(คัดลอก)

Question 1

work is measured in the unit known as what?

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2

Question 2

in which situation ,is work not done?

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2

Question 3

what class lever is an wheel barrow?

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1

Question 4

picture show a ball rolling down a smooth inclined plane,which form of energy in the ball will deceased?

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0

Question 5

when a ball rolls down a slope,what conversion of energy takes place?

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0

Question 6

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

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3

Question 7

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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1

Question 8

which of the following item does not convert electrical energy to heat energy?

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1

Question 9

what simple machine in the following is ued on a flagpole to help raise a flag?

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2

Question 10

which of the following contains elastric potential energy?

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1

Question 11

what is not true about surface water?

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1

Question 12

which waterbody holds the greatest amount of water besides the oceans?

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1

Question 13

which describes runoff the best?

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3

Question 14

what is not the way to conserve water

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1

Question 15

what is noit a possible cause of landslide?

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0

Question 16

what is the boundary between the zone of aeration and zone of saturation called?

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Question 17

what makes the surface water flood.

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1

Question 18

what is soil erosion?

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1

Question 19

what is a way to reduce soil erosion.

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1

Question 20

what happens when the groundwater is extracted over a long period of time.

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1