771: Ice skating can be used to demonstrate that when ice is under pressure, its:
(a) Melting point is lowered
(b) Melting point is raised
(c) Melting point remains unchanged
(d) Coefficient of friction with metal is reduced
772: Alauddin Khilji maintained control on price during his reign because:
(a) He wanted to keep large army at lower expenses.
(b) He had mercy with poor people.
(c) He wanted to gain popularity.
(d) All of the above
773: The 2004 Tsunami made people realize that mangroves can serve as a reliable safety hedge against coastal calamities. How do mangroves function as a safety hedge?
(a) The mangrove swamps separate the human settlements from the sea by a wide zone in which people neither live nor venture out.
(b) The mangroves provide both food and medicines which people are in need of after any natural disaster.
(c) The mangrove trees are tall with dense canopies and serve as an excellent shelter during a cyclone or Tsunami.
(d) The mangrove trees do not get uprooted by storms and tides because of their extensive roots.
774: Consider the following statements about Madam Bhikaji Cama :
1. Madam Cama unfurled the National Flag at the international Socialist Conference in Paris in the year 1907.
2. Madam Cama served as private secretary to Dadabhai Naoroji.
3. Madam Cama was born to Parsi parents.
Which of the statements given above is/are correct?
(a) 1 and 2, only
(b) 2 and 3, only
(c) 3 only
(d) 1, 2 and 3
775: Why DDT is banned in western countries?
(a) It remains in environment for a long time
(b) The insects are immunised
(c) It is a highly poisonous insecticide
(d) None of the above