416: Which one of the following is useful for biological control of pests?
(a) Honey bees and locusts
(b) Scorpions and spiders
(c) Wasps and birds
(d) Parrots and kites
417: Which one of the following countries recently upgraded its defence agency to a full defence ministry?
(a) Switzerland
(b) Japan
(c) Italy
(d) Thierry Henry
418: Which of the following was the most important characteristic of Kanishka's rule?
(a) Expansion of Buddhism outside India
(b) Re-emergence of Jainism
(c) Fourth Buddhist Council at Srinagar
(d) Gandhara School of Art
419: When light enters a closed room through a small hole in the door, the image of an outside building appears as inverted on the opposite wall. This is because:
(a) The hole acts as a convex lens
(b) Light takes curvature at the edges of the hole
(c) Of rectilinear propagation of light
(d) The hole acts as a concave lens
420: What was the immediate cause for the launch of the Swadeshi movement ?
(a) The partition of Bengal done by Lord Curzon
(b) A sentence of 18 months rigorous imprisonment imposed on Lokmanya Tilak
(c) The arrest and deportation of Lala Lajpat Rai and Ajit Singh; and passing of the Punjab Colonization Bill
(d) Death sentence pronounced on the Chapekar brothers