221: Consider the following statements regarding the earthquakes :
I. The intensity of earthquake is measured on Mercalli scale.
II. The magnitude of an earthquake is a measure of energy released.
III. Earthquake magnitudes are based on direct measurements of the amplitude of seismic waves.
IV. In the Richter scale, each whole number demonstrates a hundredfold increase in the amount of energy released.
Which of these statements are correct ?
(a) I, II and III
(b) II, III and IV
(c) I and IV
(d) I and III
Explanation:
a, 2, 3 statements are correct but not 4. Because in the Richter scale, each whole number demonstrates a ten fold increase in the amount of energy.
222: What is Rio+20 Conference, often mentioned in the news?
(a) It is the United Nations Conference on Sustainable Development
(b) It is a Ministerial Meeting of the World Trade Organization
(c) It is a Conference of the Inter-governmental Panel on Climate Change
(d) It is a Conference of the Member Countries of the Convention on Biological Diversity
223: The country scene is one of desolation, with dry, deep and narrow gullies. There is little vegetation and that too thorny shrub variety. Human settlements are scarce. The scene may belong to:
(a) West Rajasthan
(b) Bundelkhand region
(c) Malwa region
(d) Chambal valley
224: Which one of the areas marked as A, B, C and D in the given figure of the cyclone, witnesses heavy torrential short-duration rainfall accompanied by thunderstorms ?
(a) A
(b) B
(c) C
(d) D
Explanation:
The area marked by 'B' witnesses torrential downpours accompanied by thunder and lightning because in this area, maximum upliftment of warm air mass takes place.
225: Biologists have so far known, found and certified a large number of species in the plant and animal kingdom. In terms of members, the largest found and identified so far are from among the
(a) Fungi
(b) Plants
(c) Insects
(d) Bacteria
Explanation:
Class 'Insecta' of the animal kingdom, with 7,50,000 species reported, is the largest single group in both plant and animal kingdom.