4136: Three men start together to travel the same way around a circular track of 11 km. Their speeds are 4, 5.5 and 8 kmph respectively. When will they meet at the starting point for the first time?
(A) After 22 hours
(B) After 21 hours
(C) After 11 hours
(D) After 33 hours
4137: Which of the following was not the outcome of Jallianwalah Bagh massacre?
(a) Suspension of Gen. Dyer
(b) Change in Gandhiji's outlook towards Britishers
(c) Temporary peace in Punjab
(d) Renunciation of British titles and positions by many Indians
4138: A father is now three times as old as his son. Five years back, he was four times as old as his son. The age of the son is
(a) 12 years
(b) 15 years
(c) 18 years
(d) 20 years
4139: Those who joined Mahatma Gandhi during the Champaran struggle included
(a) Vallabhbhai Patel and Vinobha Bhave
(b) Jawaharlal Nehru and Rajendra Prasad
(c) Rajendra Prasad and Anugraha Narayan Sinha
(d) Mahadev Desai and Maniben Patel
4140: Consider the following:
1. Photosynthesis
2. Respiration
3. Decay of organic matter
4. Volcanic action
Which of the above add carbon dioxide to the carbon cycle on Earth
(a) 1 and 4 only
(b) 2 and 3 only
(c) 2, 3 and 4 only
(d) 1, 2, 3 and 4