16: With reference to the economic history of medieval India, the term 'Araghatta' refers to
(a) bonded labour
(b) land grants made to military officers
(c) waterwheel used in the irrigation of land
(d) wasteland converted to cultivated land
17: Which one of the following is used as an explosive?
(a) Nitroglycerine
(b) Phosphorus trichloride
(c) Mercuric oxide
(d) Graphite
18: A man whose blood group is not known meets with a serious accident and needs blood transfusion immediately. Which one of the blood groups mentioned below and readily available in the hospital will be safe for transfusion ?
(a) O, Rh-
(b) O, Rh+
(c) AB, Rh-
(d) AB, Rh+
19: Which one of the following statements is correct ?
The Prime Minister of India
(a) is free to choose his ministers only from among those who are members of either House of the Parliament
(b) can choose his cabinet colleagues after due counselling by the President of India in this regard
(c) has full discretion in the choice of persons who are to serve as ministers in his cabinet
(d) has only limited powers in the choice of his cabinet colleagues because of the discretionary power vested with the President of India
20: Which of the following Constitutional Amendments are related to raising the number of Members of Lok Sabha to be elected from the States?
(a) 6th and 22nd
(b) 13th and 38th
(c) 7th and 31st
(d) 11th and 42nd