446: Which one among the following is called philosopher's wool?
(a) Zinc oxide
(b) Zinc chloride
(c) Zinc nitrate
(d) Zinc bromide
447: The above map is the Union Territory of
(a) Chandigarh
(b) Daman and Diu
(c) Dadra and Nagar Haveli
(d) Pondicherry
448: What is the correct order of happenings of the following three events in the British rule in India?
I. Rowlatt Act
II. Hunter Report
III. Jallianwallah Bagh Tragedy
(a) I, II, III
(b) II, I, III
(c) III, II, I
(d) II, III, I
449: The half-life of a radio active element is 5 years. The fraction of the radioactive substance that remains after 20 years is
(a) 1/2
(b) 1/4
(c) 1/8
(d) 1/16
450: Which one of the following east flowing rivers of India has rift valley due to down warping ?
(a) Damodar
(b) Mahanadi
(c) Sone
(d) Yamuna