Because under the null hypothesis of no difference, the appropriate test statistic can be shown to have a t-distribution with the relevant degrees of freedom. So you use the t-test to see how well the observed test statistic fits in with a t-distribution.
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The null hypothesis of the independent samples t-test is verbalized by either accepting or rejecting it due to the value of the t-test. If the value is less than 0.05 it is accepted and greater than 0.05 is rejecting it.
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No, don't use a single t-test to compare the means of 3 or more groups. Use ANOVA.
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no t test is similar to z test because t test ie used for unknown observation and z is for the medicne