211: Diamond and Emerald contain:
(a) Carbon and silicon
(b) Carbon and zinc
(c) Silicon, aluminium and beryllium
(d) Carbon and calcium
212: What is the value of X in figure III?
(a) 4
(b) 16
(c) 25
(d) 36
213: Which of the following pairs of substances can be completely separated by sublimation ?
(a) Sand and iodine
(b) Ammonium chloride and iodine
(c) Sand and sulphur
(d) Salt and sulphur
214: It takes one minute to fill 3/7 th of a vessel. What is the time taken in minutes to fill the whole of the vessel ?
(a) 4/3
(b) 3/4
(c) 7/3
(d) 3/2
215: 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