4226: Which amongst the following States has the highest population density as per Census 2001?
(a) Kerala
(b) Madhya Pradesh
(c) Uttar Pradesh
(d) West Bengal
4227: The Harappans did not know the use of
(a) Bronze
(b) Gold
(c) Iron
(d) Silver
4228: Given below is a diary of disasters involving hazardous chemicals. Which one of the following is correctly matched?
(a) 1959, Minamata/Nigiata, Japan: Leakage at pesticide plant
(b) 1976, Sevesor Italy: Mercury discharged into waterways
(c) 1984, Bhopal, India: Leakage of dioxin
(d) 1987, Kotka, Finland: Monochloro-benzene split In harbour
4229: Triple Antigen does not immunise against:
(a) Diphtheria
(b) Tetanus
(c) Typhoid
(d) Whooping cough
4230: Recently, Scientists observed the merger of giant blackholes billions of light-years away from the Earth. What is the significance of this observation?
(a) 'Higgs boson particles' were detected.
(b) 'Gravitational waves' were detected.
(c) Possibility of inter-galactic space travel through 'wormhole' was confirmed.
(d) It enabled the scientists to understand 'singularity'.