2876: Saka era was introduced by:
(a) Ashoka
(b) Kanishka
(c) Chandragupta Maurya
(d) Harsha Vardhana
2877: Why is there a severe difference in the climates of Northern and Southern Hemisphere?
(a) Due to rotation of the earth around its axis
(b) Due to revolution of the earth around the sun of its orbit
(c) Both of the above
(d) None of the above
2878: Fresco paintings in the Ajanta Caves were done, while which of the following dynasties was flourishing?
(a) Guptas
(b) Sungas
(c) Kanvas
(d) Mauryas
2879: Consider the following statements :
1. On the planet Earth, the fresh water available for use amounts to about less than 1% of the total water found.
2. Of the total fresh water found on the planet Earth 95% is bound up in polar ice caps and glaciers.
Which of the statements given above is/are correct ?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
2880: An air bubble in water will act like a
(a) convex mirror
(b) convex lens
(c) concave mirror
(d) concave lens