36: Amit started a business by investing Rs. 30,000. Rahul joined the business after some time and invested Rs. 20,000. At the end of the year, profit was divided in the ratio of 2 : 1. After how many months did Rahul joined the business?
(a) 2
(b) 3
(c) 4
(d) 5
37: Recently there was a proposal to translocate some of the lions from their natural habitat in Gujarat to which one of the following sites?
(a) Corbett National Park
(b) Kuno Palpur Wildlife Sanctuary
(c) Mudumalai Wildlife Sanctuary
(d) Sariska National Park
38: Which one of the following is not a satellite of Jupiter?
(a) Io
(b) Callisto
(c) Europa
(d) Titan
39: Among the following, which one lays eggs and does not produce young ones directly?
(a) Kangaroo
(b) Echidna
(c) Whale
(d) Porcupine
40: The principal cause of soil damage in Punjab and Haryana is:
(a) Salinity and water-logging
(b) Deforestation
(c) Ravine erosion
(d) Overgrazing