Physics
In very cold countries alcohol is used as a thermometric liquid because

Its freezing point is very low
Alcohol can be coloured for its level to be seen easily
It will not stick to the glass tube
Alcohol is a poor conductor of heat

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

None of these
It will fall down at the same place where the string breaks
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
The ball will travel towards the center of the circle and fall down

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

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