3446: An air bubble in water will act like a
(a) convex mirror
(b) convex lens
(c) concave mirror
(d) concave lens
3447: On a railway route between two places A and B, there are 10 stations on the way. If 4 new stations are to be added, how many types of new tickets will be required if each ticket is issued for a one way journey?
(A) 108
(B) 14
(C) 96
(D) 48
3448: Biodiversity forms the basis for human existence in the following ways:
1. Soil formation
2. Prevention of soil erosion
3. Recycling of waste
4. Pollination of crops
Select the correct answer using the codes given below:
(a) 1, 2 and 3 only
(b) 2, 3 and 4 only
(c) 1 and 4 only
(d) 1, 2, 3 and 4
3449: Which amongst the following provided a common factor for tribal insurrection in India in the 19th century ?
(a) Influence of rise of a large number of money lenders, traders and revenue farmers as middlemen in tribal areas
(b) The complete disruption of the old agrarian order of the' tribal communities
(c) Influence of foreign religious missionaries in tribal areas
(d) Introduction of a new system of land revenue and taxation of tribal products
3450: The rainbow and the rainbow-like colours seen on a thin film of oil on a water surface are two phenomena. They are
(a) Similar in nature and both are due to refraction of light
(b) Different in nature and rainbow is due to interference of light, while colour of thin film is due to diffraction
(c) Similar in nature and both are due to interference of light
(d) Different in nature and rainbow is due to refraction, while colour of thin film is due to interference of light