Physics
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

Less than the weight of the man
Zero
Same as the weight of the man
Greater than the weight of the man

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Physics
In the gamma decay of a nucleus

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

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor but can be of any shape
Should be in the form of a vertical rod
Should be made of a good conductor like copper with sharp-pointed edges
Can be of any shape

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