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Physics

Physics
Speed of sound is the greatest in :

Glycerine
Water
Glass
Air

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Physics
At boiling point of liquids, its

Temperature increases
Temperature remains constant
Vapour pressure decreases
Atmospheric pressure increases

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Physics
After long periods of use, a grey spot develops on the inside of a bulb. This is because

Dust inside the bulb condenses on the top
The heat of the bulb scorches the glass at the top
The tungsten filament evaporates and collects there
Glass undergoes a change due to the heat

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Physics
Which of the following is used to split white light into different colours ?

Convex lens
Prism
Concave lens
Glass slab

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

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

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Physics
Water boils at a lower temperature on the hills because

It is cold on the hills
There is less carbon dioxide on the hills
There is a decrease in air pressure on the hills
There is less oxygen

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