2436: Which of the following substances are found in the beach sands of many parts of Kerala?
1. Ilmenite
2. Zircon
3. Silimanite
4. Tungsten
Select the correct answer using the code given below :
(a) 1, 2, 3 and 4
(b) 1, 2 and 3
(c) 3 and 4 only
(d) 1 and 2 only
2437: Urea is prepared by the chemical reaction of:
(a) Ammonia and Carbon dioxide
(b) Ammonium sulphate and calcium chloride
(c) Acetamide and ethyl alcohol
(d) Chlorine and water
2438: In the eye donation, which part of the eye is transplanted from the donor ?
(a) Cornea
(b) Lens
(c) Retina
(d) The whole eye
2439: Consider the following techniques/phenomena:
1. Budding and grafting in fruit plants
2. Cytoplasmic male sterility
3. Gene silencing
Which of the above is/are used to create transgenic crops?
(a) 1 only
(b) 2 and 3
(c) 1 and 3
(d) None
2440: If you travel by road from Kohima to Kottayam, what is the minimum number of States within India through which you can travel, including the origin and the destination?
(a) 6
(b) 7
(c) 8
(d) 9