Physics
What is the other name of Galileo's law of falling bodies?

Newton's third law
Newton's first law
Law of motion
Newton's second law

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

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Physics
In the gamma decay of a nucleus

Neither the mass number nor the atomic number of the nucleus changes
Both the mass number and the atomic number of the nucleus change
The mass number of the nucleus does not change whereas its atomic number changes
The mass number of the nucleus changes whereas its atomic number does not change

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Water in the pipes freezes and on freezing water expands, so pipes break
Frost makes the pipes rusty, so they break
None of these
The material of which pipes are made contracts due to cold and so breaks

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