Physics
A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to

Change in momentum
Inertia of motion
Outward pull on him
Change in acceleration

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Physics
In the gamma decay of a nucleus

Neither the mass number nor the atomic number of the nucleus changes
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
Both the mass number and the atomic number of the nucleus change

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Physics
Railway tracks are banked on curves so that

The train may not fall down inwards
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train
Necessary centripetal force may be obtained from the horizontal component of the weight of the train

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