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

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 heat to get into the food through the hole
To allow the microwaves to get into the food through the holes

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Physics
X-rays region lies between

Short radio waves and long radio waves
Ultraviolet and visible region
Gamma-rays and ultraviolet region
Visible and infra-red region

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

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