321: There are 10 identical coins and each one of them has H engraved on its one face and T engraved on its other face. These 10 coins are lying on a table and each one of them has H face as the upper face.
In one attempt, exactly four (neither more nor less) coins can be turned upside down. What is the minimum total number of attempts in which the T faces of all the 10 coins can be brought to be the upper faces ?
322: What was the main reason for which Niger was in the news in recent times?
(A) Famine and starvation
(B) Many deaths due to AIDS
(C) Fierce civil war
(D) Intense fighting with Algeria
323: Consider the following animals
1. Sea cow
2. Sea horse
3. Sea lion
Which of the above is/are mammal/mammals?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
324: The coal mining areas of the Damodar Valley region include
(a) Korba, Sonhat and Raigarh
(b) Singareni, Tandur and Sasti
(c) Raniganj, Jharia and Giridih
(d) Talcher. Ghanda and Sambalour
325: The ideal of 'Welfare State' in the Indian Constitution is enshrined in its
(a) Preamble
(b) Directive Principles of State Policy
(c) Fundamental Rights
(d) Seventh Schedule