1. Which of the following is the best conductor of electricity ?
A. Copper
B. Mica
C. Zinc
D. Silver
2. Soda water contains–
A. Nitrous acid
B. Carbonic acid
C. Carbon dioxide
D. Sulphuric acid
3. Which of the following is basis of the modern periodic table ?
A. Atomic mass
B. Atomic number
C. Atomic size
D. Atomic volume
4. Of the following metals, which one pollutes the air of a big city ?
A. Copper
B. Cadmium
C. Lead
D. Chromium
5. Bell Metal is an alloy of–
A. Brass and Nickel
B. Zinc and Copper
C. Tin and Copper
D. Nickel and Copper
6. The high temperature superconductors are–
A.Metal alloys
B.Ceramic oxides
C. Inorganic polymers
D. Pure rare earth metals
7. The ingredients of Gun metal are
A. Iron, tin
B. Copper, tin
C. Iron, brass, tin
D. Iron, zinc, titanium
8. The neutral atom’s two isotopes differ in the number of–
A. Electron shells
B. Protons
C. Valence electrons
D. Neutrons
9. Optical fibres are mainly used in
A. Communication
B. Weaving
C. Musical Instruments
D. Food Industry
10. The first synthetic fibre made by man was–
A. Rayon
B. Nylon
C. Polyester
D. Terycott
11. Polythene is industrially prepared by the polymerization of–
A. Methane
B. Styrene
C. Acetylene
D. Ethylene
12. A mixture of water and alcohol can be separated by–
A. Filtration
B. Evaporation
C. Distillation
D. Decantation
13. A substance which changes readily into vapour without heating is called–
A. Efflorescent
B. Synthetic
C. Volatile
D. Effervescent
14. German biochemist, Emil Fischer
A. gave Operon model
B. compared the fit between enzyme substrate to lock and key
C. proposed the theory of competitive inhibition
D. proposed the feed back inhibition theory
15. Enzymes generally have–
A. same pH and temperature optima
B. same pH but different temperature optima
C. different pH but same temperature optima
D. different pH and temperature optima
16. Coenzyme is–
A. always protein
B. often metal
C. always inorganic compound
D. often a vitamin
17. Cholesterol is one kind of–
A. Saturated fatty acid
B. unsaturated fatty acid
C. Steroid
D. Diglyceride
18. Ethyl-alcohol is mixed completely with water. How ethyl alcohol is separated from the mixture ?
A. by separation flannel
B. by evaporation
C. partial-distillation
D. evaporation of water
19. White vitriol is–
A. FeSO4, 7H2O
B. ZnSO4, 7H2O
C. MgSO4, 7H2O
D. CuSO4, 7H2O
20. Combustion is a process by which–
A. heat is produced
B. light is produced
C. heat and light both are produced
D. None of these
21. Which of the following is the best conductor of Electricity ?
A. Ordinary water
B. Sea water
C. Boiled water
D.Distilled water
22. Balloons are filled with–
A. Helium
B. Oxygen
C. Nitrogen
D. Argon
23. The charcoal used to decolourise raw sugar is–
A. Animal charcoal
B. Sugar charcoal
C. Cocoanut charcoal
D. Wood charcoal
24. Washing soda is the common name of–
A. Calcium Carbonate
B. Calcium Bi-Carbonate
C. Sodium Carbonate
D. Sodium Bi-Carbonate
25. The filament of electric bulb is made of–
A. Iron
B. Nichrome
C. Tungsten
D. Graphite
26. Bleaching powder is made from
A. Sulphur dioxide and gypsum
B. Chlorine and Charcoal
C. Soda ash and lime
D. Lime and Chlorine
27. Brass is an alloy of–
A. Nickel and Copper
B. Copper and Silver
C. Nickel and Zinc
D. Zinc and Copper
28. The element required for Solar energy conversion–
A. Beryllium
B. Silicon
C. Tantalum
D. Ultra pure carbon
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