Ques:- Which of the following is not the main head of expenditureof the central government?
A. Defence expenditure
B. Public health
C. Grants-in-aid
D. Interest of loans
Ques:- Gold is 19 times as heavy as water and copper is 9 times. In what ratio should these metals be mixed so that the mixture may be 15 times as heavy as water?
A. 2 : 1
B. 3 : 2
C. 4 : 3
D. 5 : 4