1. Which of the following is the lightest metal ? (A) Mercury (B) Silver (C) Lithium (D) Lead
2. The most important ore of Aluminium is — (A) Bauxite (B) Calamine (C) Calcite (D) Galena
3. The element present in the largest amount in rocks and minerals is — (A) Carbon (B) Silicon (C) Hydrogen (D) Aluminium
4. An alloy used in making heating elements for electric heating devices is — (A) Solder (B) Alloysteel (C) Nichrome (D) German Silver
5. German Silver is an alloy of — (A) Copper, Silver & Nickel (B) Silver, Copper & Aluminium (C) Zinc, Copper & Nickel (D) Silver, Zinc & Nickel
6. Air is a/an — (A) Compound (B) Element (C) Mixture (D) Electrolyte
7. Which of the following is the best conductor of Electricity ? (A) Ordinary water (B) Sea water (C) Boiled water (D) Distilled water
8. Balloons are filled with — (A) Helium (B) Oxygen (C) Nitrogen (D) Argon
9. The charcoal used to decolourise raw sugar is — (A) Animal charcoal (B) Sugar charcoal (C) Cocoanut charcoal (D) Wood charcoal
10. The most abundant metal in the earth’s crust is — (A) Zinc (B) Copper (C) Aluminium (D) Iron
11. The gas used to extinguish fire is — (A) Neon (B) Nitrogen (C) Carbon dioxide (D) Carbon Monoxide
12. In which of the following activities Silicon Carbide is used ? (A) Making cement and glass (B) Disinfecting water and ponds (C) Making castes for statues (D) Cutting very hard substances
13. The element common to all acids is — (A) Oxygen (B) Hydrogen (C) Nitrogen (D) Sulphur
15. The most malleable metal is — (A) Silver (B) Gold (C) Aluminium (D) Sodium
16. Tetraethyl lead is used as — (A) Mosquito repellent (B) Pain Killer (C) Fire extinguisher (D) Petrol additive
17. Which of the following is used in beauty parlours for hair setting ? (A) Phosphorus (B) Sulphur (C) Chlorine (D) Silicon
18. Which of the following is a non-metal that remains liquid in room temperature ? (A) Bromine (B) Chlorine (C) Helium (D) Phosphorus
19. From which mineral is radium obtained — (A) Limestone (B) Haematitie (C) Pitchblende (D) Rutile
20. What is laughing gas ? (A) Carbon dioxide (B) Sulphur dioxide (C) Nitrogen Dioxide (D) Nitrous oxide
21. Which of the following is used as a material for making protective windows in space probes ? (A) Steel (B) Graphite (C) Tungsten (D) Diamond
22. Which form of phosphorus is used in safety metals? (A) Red Phosphorus (B) White Phosphorus (C) Yellow Phosphorus (D) Black Phosphorous
23. Stainless steel is an alloy of — (A) Iron, Carbon and Nickel (B) Iron and Manganese (C) Iron, Chromium and Zinc (D) Iron, Chromium and Nickel
24. Which of the following is not correctly matched ? (A) Galena : Lead Sulphide (B) Green vitriol : Copper sulphate (C) Plaster of Paris : Calcium sulphate (D) Calomel : Mercurous Chloride
25. Which of the following metals forms an amalgum with other metals ? (A) Lead (B) Tin (C) Zinc (D) Mercury
