86: Examine the following statements regarding a set of balls :
I. All balls are black.
II. All balls are white.
III. Only some balls are black.
IV. No balls are black.
Assuming that the balls can only be black or white, which two statements given above can both be true, but cannot both be false ? Choose the correct answer from the codes given below :
Codes :
(a) I and IV
(b) I and III
(c) II and III
(d) III and IV
87: He wrote biographies of Mazzini, Garibaldi, Shivaji and Shrikrishna; stayed in America for some time; and was also elected to the Central Assembly. He was
(a) Aurobindo Ghosh
(b) Bipin Chandra Pal
(c) Lala Lajpat Rai
(d) Motilal Nehru
88: Which one of the following statements is not correct ?
Dinar/New dinar is the currency of
(a) Sudan
(b) Yugoslavia
(c) U.A.E
(d) Tunisia
89: Consider the following statements :
An amendment of the Constitution of India can be initiated by the
I. Lok Sabha.
II. Rajya Sabha.
III. State Legislatures.
IV. President.
Which of the above statements is/are correct ?
(a) I alone
(b) I, II and III
(c) II, III and IV
(d) I and II
90: In an atom, the order of filling up of the orbitals is governed by
(a) Aufbau principle
(b) Heisenberg's uncertainty principle
(c) Hund's rule
(d) Pauli's exclusion principle