4021: Why is it easier to cook in a pressure cooker?
(a) High pressure creates turbulence
(b) More steam is formed inside the cooker
(c) Boiling point of water is raised
(d) Boiling point of water is lowered
4022: Consider the following which can be found in the ambient atmosphere:
1. Soot
2. Sulphur hexafluoride
3. Water vapour
Which of the above contribute to the warming up of the atmosphere ?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3
4023: Four different candles, which can last for 5 hours, 4 hours. 3 hours and 2 hours of burning, respectively, are lit in a room at the same instant and allowed to burn till such time that the three candles in the room get extinguished. The cost of burning each one of these candles is 75 paise per hour. The cost involved is:
(a) Rs. 2.75
(b) Rs. 3.75
(c) Rs. 9.75
(d) Rs. 12.50
4024: Which one of the following statements is correct?
(a) East Timor was a British colony for four centuries
(b) The European colonial rulers handed over East Timor to Indonesia in 1975
(c) The United Nations took over East Timor in 1999 to prepare it for independence
(d) East Timor finally declared its independence in December 2001
4025: Consider the following statements :
The Ministerial Meeting of the WTO held in December 1999 was unsuccessful because it attempted to link trade with
I. labour related issues.
II. environment related issues.
III. terrorism related issues.
IV. debt-related issues.
Which of these statements are correct ?
(a) I, III and IV
(b) I and II
(c) II and III
(d) II and IV