Friday, 21 April 2017


1When Helium atom Loses electron, then it becomes-Positive Helium ion
2The mass number of a nucleus is -72 0sometimes more and sometimes equal to its atomic number
3The weight of 6.023 × 1022 atoms of carbon is -1-2gram
4Which of the following particle has the dual nature of particle wave?Electron
5Mass number is the sum of -Protons and Neutrons
6An alloy used in making heating elements for electric heating devices is -Nichrome
7The use of Heat treatment of ore that includes smelting and roasting is termed as-Pyrometallurgy
8Which of the following does not contains silver?German Silver
9Aluminum is extracted from -Bauxite
10The ore of Aluminum is -Bauxite
11Brass contains -Copper and Zinc
12Brass is made ofCopper and Zinc
13Maximum permissible concentration of copper in drinking water in mg/L is -2
14Brass gets discoloured in air due to the presence of which gas in air?Hydrogen sulphide (H2S)
15Which type of Glass is used for making glass reinforced plastic?Fiber glass
16Purification of copper is done by -E l e c t r o l y t i c decomposition
17Non-Metal found in Liquid state is -Bromine
18The phenomenon of ejection of electrons from the metal surface when a light of suitable frequency falls on it is called-Photoelectric effect
19Acute Lead poisoning is also known as -Plumbism
20Which of the following metal has least melting point?Mercury
21Which of the following metal forms amalgam with other metals?Mercury
22Amalgam is an alloy in which the base metal is-Mercury
23What is Baeyer's reagent?Alkaline Potassium Permanganate
24Hygroscopic substances are those substance which ready absorb-Water Vapors
25Rusting of Iron is -Due to oxidation
26The rusting of iron metal in air needs both-Oxygen and Moisture
27Which of the following is required for the rusting of iron?oxygen and water
28Iron rusts quickly in -Sea water
29The rusting of iron-Increases its weight
30Which of the following is not a chemical change?Conversion of water into steam
31If the bullets could not be removed from gunshot injury of a man, it may cause poisoning by- 0 65292Lead
32The ratio of pure gold in 18 carat gold is -75%
33The King of metal is -Gold
34German Silver contains following Metals -Copper, Zinc, Nickel
35Which of the following is not contained by the German Silver?Silver
36Which metal is used to Galvanize iron?Zinc
37To protect the iron from getting rusted, the coat of zinc is applied on it. This process is known as-72Galvanization
38Ultra purification of a Metal is done by-Zone Melting
39Glass is a -Supper cooled Liquid
40Which of the following contains high content of Lead?High octane fuel
41Which of the following is not favourable to prevent iron from rusting?Annealing
42Which of the following is responsible for extra strength of Pyrex glass?Borax
43Which one of the following metals does not react with water to produce hydrogen?Cadmium
44Which one of the following reacts with Fehling's solution?HCHO
45Sodium vapor Lamps glow with yellow Light. This is due to-Sublimation of sodium to emit yellow colour
46The Element which does not occours in nature but can be formed, isRadium
47Which of the following elements behave chemically both as metal and a non-metal?Boron
48Which of the following metal has maximum electrical conductivity?Silver
49Which of the following is most bad conductor?65292Lead
50Bronze is an alloy of-Copper and Tin

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