Physics
Which of these waves can be polarized ?

Light waves
Transverse waves on a string
Sound waves in air
Longitudinal waves on a string

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Physics
In the gamma decay of a nucleus

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
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

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Physics
Circuit breaker usually operate under

Transient state of short-circuit current
After D. C. component has ceased
Steady state of short-circuit current
Sub-transient state of short-circuit current

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