Q. How many orbiting electron does the germanium atom have?
Q. Intrinsic semiconductor material is charaterized by a valence shell of how many electrons ?
Q. The diffused impurities with how many valence electrons are called donor atoms?
Q. Zinc is used to protect iron from corrosion because zinc is -
1) more electropositive than iron
2) cheaper than iron
3) a bluish white metal
4) a good conductor of heat and electricity
Q. Which one of the following gases is placed second in respect of abundance in the Earth's atmosphere?
4) Carbon dioxide
Q. Which one among the following chemicals is used as washing soda?
1) Calcium carbonate
2) Calcium bicarbonate
3) Sodium carbonate
4) Sodium bicarbonate
Q. Which one of the following is a chemical change?
1) Cutting of hair
2) Graying of hair naturally
3) Swelling of resin in water
4) Cutting of fruit
Q. Why is potassium permanganate used for purifying drinking water ?
1) It kills germs
2) It dissolves the impurities
3) It is a reducing agent
4) It is an oxidizing agent
Q. Electron emission from a metallic surface by application of light is known as-
1) Thermionic emission
2) Photoelectric emission
3) High field emission
4) Auto-electronic emission
Q. Urea is-
1) A nitrogen containing organic compound
2) A nitrogen containing inorganic compound
3) A plant hormone
4) An Endergonic compound
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