61.Which of the following are true regarding the compact fluorescent tubes now available in market for bome use ? 1. They use less power (about 20 %) compared to filament type bulbs for same amount of light. 2. They operate at higher voltages. 3. They are narrower and shorter than common fluorescent tubes.

62.Which is a small conical gland like structure of unknown function found in the brain of vertebrates ?

63.In an ordinary dry cell, the electrolyte is

64.The two elements that are frequently used for making transistors are

65.Which of the following structures (glands) is concerned with the production of cortisone hormone in man ?