Physics
Convex mirrors are used as a rear view mirror in motor cycles because

All of these
It forms smaller image as compared with object
It forms erect (upright) image
It forms real image

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Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To allow the heat to get into the food through the hole
To prevent the steam pressure from bursting open the pouch
To allow the aroma of the food to come out through the holes
To allow the microwaves to get into the food through the holes

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Physics
Siphon will fail to work if:

The level of the liquid in the two vessels are at the same height.
Both its limbs are of unequal length.
The temperature of the liquids in the two vessels are the same.
The densities of the liquid in the two vessels are equal.

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