1636: Which of the following practices can help in water conservation in agriculture?
1. Reduced or zero tillage of the land
2. Applying gypsum before irrigating the field
3. Allowing crop residue to remain in the field
Select the correct answer using the code given below :
a. 1 and 2 only
b. 3 only
c. 1 and 3 only
d. 1, 2 and 3
1637: A hydrogen inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will
(a) Decrease in size
(b) Flatten into a disc-like shape
(c) Increase in size
(d) Maintain the same size and shape
1638: Which one of the following is another name of RDX ?
(a) Selenium
(b) Cyclonite
(c) Cyanohydrin
(d) Cyclohexane
1639: Consider the following rivers:
1. Barak
2. Lohit
3. Subansiri
Which of the above flows / flow through Arunachal Pradesh?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
1640: The native State of Tripura became involved in the Freedom Movement early in the 20th century because
(a) the kings of Tripura were always anti-British
(b) the Bengal revolutionaries took shelter in Tripura
(c) the tribes of the State were fiercely freedom loving
(d) there were already some groups fighting against the kingship and its protector, the British