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Physics

Physics
When water freezes its density

Remains constant
Increases
Becomes Zero
Decreases

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Physics
Which best describes how air moves during convection?

Cool air falls down
Warm air falls down
Air always falls down
Cool air is replaced by warm air

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Physics
A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle

At the lower elevation than the bird
In the same direction as the bird
At a higher elevation than the bird
Vertically upwards

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Physics
Which is an example of Phototropism?

Plant bending toward the light
Roots of a plant following water
A venus flytrap capturing a fly
Roots growing into the soil

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Physics
Beta rays emitted by a radioactive material are

Charged particles emitted by nucleus
Electromagnetic radiations
The electrons orbiting around the nucleus
Neutral particles

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Physics
The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes?

0.12847222222222
2.0958333333333
1.0479166666667
0.21041666666667

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