61: Gypsum is added to cement clinker to
(a) Increase the tensile strength of the cement
(b) Bind the particles of calcium silicate
(c) Decrease the rate of setting of cement
(d) Facilitate the formation of colloidal gel
62: Which one of the following is the correct sequence of the states (labelled 1, 2, 3 and 4) of India shown on the map in descending order in terms of their available ground water resources for irrigation ?
(a) 3, 4, 1, 2
(b) 3, 4, 2, 1
(c) 4, 3, 1, 2
(d) 4, 3, 2, 1
63: For which one of the following countries is Spanish not an official language?
(a) Colombia
(b) Cuba
(c) Republic of Congo
(d) Chile
64: With reference to the Constitution of India, consider the following:
1. Fundamental Rights
2. Fundamental Duties
3. Directive Principles of State Policy
Which of the above provisions of the Constitution of India is/are fulfilled by the National Social Assistance Programme launched by the Government of India ?
(a) 1 only
(b) 1 and 3 only
(c) 3 only
(d) 1, 2 and 3
65: The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation?
1. There are no clouds or water vapour in the lower stratosphere.
2. There are no vertical winds in the lower stratosphere.
which of the statements given above is/are correct in this context?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2