Physics
When an electric bulb breaks, there is an explosive sound. That is due to

The compressed gases inside rushing out suddenly
The chemical reaction between the gases inside the bulb
None of these
The air outside rushing in to fill the vacuum inside the bulb

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Physics
The sky appears blue because

The atmosphere scatters blue colour more than the others
In white light, the blue component dominates
All colours interfere to produce blue
It is actually blue

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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

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

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