576: The Ramon Magsaysay Award winner Shanta Sinha is known as:
(a) A campaigner for urban sanitation
(b) An anti-child labour activist
(c) An organiser of rain-water harvesting schemes
(d) An activist for the welfare of poor rural women
577: Out of the three annual examinations, each with a total of 500 marks, a student secured average marks of 45% and 55% in the first and second annual examinations. To have an overall average of 60%, how many marks does the student need to secure in the third annual examination ?
(a) 450
(b) 400
(c) 350
(d) 300
578: Diamond and Emerald contain:
(a) Carbon and silicon
(b) Carbon and zinc
(c) Silicon, aluminium and beryllium
(d) Carbon and calcium
579: Hughly was used as a base for piracy in the Bay of Bengal by
(a) the Portuguese
(b) the French
(c) the Danish
(d) the British
580: Man cannot digest cellulose whereas cows can do so because
(a) Their gut contains certain bacteria capable of digesting cellulose
(b) They have a many-chambered stomach
(c) They have efficient grinding molars
(d) They produce an enzyme cellulose which can digest cellulose