2871: Which of the following can be threats to the biodiversity of a geographical area?
1. Global warming
2. Fragmentation of habitat
3. Invasion of alien species
4. Promotion of vegetarianism
Select the correct answer using the codes given below :
(a) 1, 2 and 3 only
(b) 2 and 3 only
(c) 1 and 4 only
(d) 1, 2, 3 and 4
2872: Cyclist A starts down a road at a speed of 15 km/hour. Cyclist B starts 20 minutes later from the same spot at a speed of 20 km/hour. B will overtake A after __________
(a) 1 hour
(b) 1½ hours
(c) 2 hours
(d) 2½ hours
2873: 3 digits are chosen at random from 1, 2, 3, 4, 5, 6, 7, 8 and 9 without repeating any digit. What is the probability that their product is odd?
(A) 7/48
(B) 5/108
(C) 2/3
(D) 5/42
2874: During the freedom struggle, Aruna Asaf Ali was a major woman organizer of underground activity in
(a) Non-Cooperation Movement
(b) Civil Disobedience Movement
(c) Swadeshi Movement
(d) Quit India Movement
2875: Who among the following attended all the three Round Table Conferences?
(a) Madan Mohan Malaviya
(b) Mahatma Gandhi
(c) Sarojini Naidu
(d) B. R. Ambedkar