Question 22

The largest single source of federal revenue is

	1.	excise taxes and customs duties
	2.	contributions for social insurance.
	3.	the corporation income tax.
	4.	the personal income tax.

Question 28

The federal income tax began as a result of

	1.	a constitutional amendment.
	2.	an act of Congress.
	3.	the bill of rights.
	4.	an executive order.