3101: A bag contains 20 balls, 8 balls are green, 7 are white and 5 are red. What is the minimum number of balls that must be picked up from the bag blind folded (without replacing any of it) to be assured of picking at least one ball of each colour ?
(a) 4
(b) 7
(c) 11
(d) 16
3102: The original name of Mahabharata was
(a) Brihit Katha
(b) Sahastra Samhita
(c) Jaya Samhita
(d) Rajatarangini
3103: Which of the following is a weedkiller?
(a) Insecticide
(b) Methyl salicylate
(c) Heribicide
(d) None of these
3104: Which of the following is/are the example /examples of chemical change ?
1. Crystallization of sodium chloride.
2. Melting of ice
3. Sourcing of milk
Select the correct answer using the code given below:
(a) 1 and 2 only
(b) 3 only
(c) 1, 2 and 3
(d) None
3105: Hormones which are necessary for the development of the human body are secreted by:
(a) Thyroid gland
(b) Pituitary gland
(c) Parathyroid gland
(d) Exocrine gland