Physics
The bats can fly in the dark because

They can see the objects in darkness
They have weak legs and are likely to be attacked by predators
They generate ultrasonic sound waves
They generate flashes of light

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Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

None of these
Increasing the height of water in the vessel
Increasing the radius of the capillary tube
Decreasing the radius of the capillary tube

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