1. Which of the
following is the lightest metal ?

(A) Mercury (B) Silver
(C) Lithium (D) Lead (Ans : C)

2. The most important ore of Aluminium is–
(A) Bauxite (B) Calamine
(C) Calcite (D) Galena (Ans : A)

3. The element present in the largest amount in rocks and minerals is–
(A) Carbon (B) Silicon
(C) Hydrogen (D) Aluminium (Ans : B)

4. The chemial name of Uria is–
(A) Aneurin (B) Chloroetane
(C) Carbamide (D) None of these (Ans : C)

5. Permanent hardness of water can be removed by adding–
(A) Potassium Permanganate (B) Chlorine
(C) Bleaching Powder (D) Washing Soda (Ans : D)

6. The formula of Plaster of Paris is–
(A) CaSO4 (B) CaSO4, 2H2O
(C) 2CaSO4, 4H2O (D) 2CaSO4, H2O (Ans

7. Liquefied Petroleum gas (LPG) consists of mainly–
(A) Methane, Ethane and Hexane (B) Ethane, Hexane and Nonane
(C) Methane, Butane and Propane (D) Methane, Hexane and Nonane (Ans : C)

8. The metal that is present in Photo Films is–
(A) Mercury (B) Platinium
(C) Magnesium (D) Silver (Ans : D)

9. Which of the following is in liquid form at room temperature ?
(A) Cerium (B) Sodium
(C) Francium (D) Lithium (Ans : C)

10. The property of a substance to absorb moisture from the air on exposure is
(A) Osmosis (B) Desiccation
(C) Efflorescence (D) Deliquescene (Ans : D)

11. Brass gets discoloured in air due to the presence of which gas in air–
(A) Carbon dioxide (B) Oxygen
(C) Hydrogen Sulphide (D) Nitrogen (Ans : C)

12. Quartz crystals normally used in quartz clocks etc. is chemically–
(A) Sodium Silicate (B) Silicon dioxide
(C) Germenium dioxide (D) A mixture of (B) and (C) (Ans : B)

13. Which of the following elements is non-radioactive?
(A) Uranium (B) Thorium
(C) Plutonium (D) Zirconium (Ans : D)

14. According to Dalton’s atomic theory the smallest particle which can exist
independently is–
(A) An atom (B) A molecule
(C) A cation (D) An anion (Ans : A)

15. The recent atomic weight scale is based on–
(A) 1H1 (B) 1H2
(C) 6C12 (D) 8O16 (Ans : C)

16. The major ingredient of leather is–
(A) Carbohydrate (B) Collagen
(C) Polymer (D) Nucleic acid (Ans : B)

17. Glass is made from the mixture of–
(A) Quartz and mica (B) Sand and salt
(C) Sand and silicates (D) None of these (Ans : C)

18. Epoxy resins is used as–
(A) Moth repellants (B) Insecticides
(C) Detergents (D) Adhesives (Ans : D)

19. One fathom is equal to–
(A) 6 metres (B) 6 feet
(C) 60 feet (D) 60 cms (Ans : B)

20. What is the unit for measuring the pitch or frequency of sound ?
(A) Coulomb (B) Hum
(C) Cycles (D) Decible (Ans : D)

21. The fastest acting enzyme in the biological kingdom is–
(A) lipase (B) amylase
(C) carboxypeptidase (D) carbonic anhydrase (Ans : D)

22. Lightening cause rainfall because–
(A) It cause combination of oxygen and nitrogen (B) Some of the gas molecules
become bigger
(C) It activate H2O molecule (D) Photo-electricity reaction starts (Ans

23. Nitrification means–
(A) Liquifaction of nitrogen (B) Convert the atmospheric nitrogen to effective
nitrogen compound.
(C) Production of nitrogen from air (D) Conversion of nitrogen to nitric acid.
(Ans : B)

24. Cell membrane is–
(A) permeable (B) selectively permeable
(C) semipermeable (D) impermeable (Ans : C)

25. Polythene is industrially prepared by the polymerisation of–
(A) methane (B) styrene
(C) acetylene (D) ethylene (Ans : D) –

1. An alloy
used in making heating elements for electric heating devices is–
(A) Solder (B) Alloysteel
(C) Nichrome (D) German Silver (Ans : C)

2. German Silver is an alloy of–
(A) Copper, Silver and Nickel (B) Silver, Copper and Aluminium
(C) Zinc, Copper and Nickel (D) Silver, Zinc and Nickel (Ans : C)

3. Air is a/an–
(A) Compound (B) Element
(C) Mixture (D) Electrolyte (Ans : C)

4. Which of the following substance is a bad conductor of electricity but a
good conductor of heat?
(A) Asbestos (B) Celluloid
(C) Purspecks (D) Mica (Ans : D)

5. Carborandum is–
(A) Silicon Dioxide (B) Silicon Carbide
(C) Silicon Nitride (D) Silicon Phosphide (Ans : B)

6. Which of the following is the best conductor of electricity ?
(A) Copper (B) Mica
(C) Zinc (D) Silver (Ans : D)

7. Soda water contains–
(A) Nitrous acid (B) Carbonic acid
(C) Carbon dioxide (D) Sulphuric acid (Ans : C)

8. Which of the following is basis of the modern periodic table ?
(A) Atomic mass (B) Atomic number
(C) Atomic size (D) Atomic volume (Ans : B)

9. Of the following metals, which one pollutes the air of a big city ?
(A) Copper (B) Cadmium
(C) Lead (D) Chromium (Ans : C)

10. Bell Metal is an alloy of–
(A) Brass and Nickel (B) Zinc and Copper
(C) Tin and Copper (D) Nickel and Copper (Ans : C)

11. The high temperature superconductors are–
(A) Metal alloys (B) Ceramic oxides
(C) Inorganic polymers (D) Pure rare earth metals (Ans : B)

12. The ingredients of Gun metal are–
(A) Iron, tin (B) Copper, tin
(C) Iron, brass, tin (D) Iron, zinc, titanium (Ans : B)

13. The neutral atom’s two isotopes differ in the number of–
(A) Electron shells (B) Protons
(C) Valence electrons (D) Neutrons (Ans : D)

14. Optical fibres are mainly used in–
(A) Communication (B) Weaving
(C) Musical Instruments (D) Food Industry (Ans : A)

15. The first synthetic fibre made by man was–
(A) Rayon (B) Nylon
(C) Polyester (D) Terycott (Ans : B)

16. Polythene is industrially prepared by the polymerization of–
(A) Methane (B) Styrene
(C) Acetylene (D) Ethylene (Ans : D)

17. A mixture of water and alcohol can be separated by–
(A) Filtration (B) Evaporation
(C) Distillation (D) Decantation (Ans : C)

18. A substance which changes readily into vapour without heating is called–
(A) Efflorescent (B) Synthetic
(C) Volatile (D) Effervescent (Ans : C)

19. German biochemist, Emil Fischer–
(A) gave Operon model (B) compared the fit between enzyme substrate to lock and
(C) proposed the theory of competitive inhibition (D) proposed the feed back
inhibition theory (Ans : B)

20. 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 (Ans : C)

21. Coenzyme is–
(A) always protein (B) often metal
(C) always inorganic compound (D) often a vitamin (Ans : D)

22. Cholesterol is one kind of–
(A) Saturated fatty acid (B) unsaturated fatty acid
(C) Steroid (D) Diglyceride (Ans : A)

23. 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 (Ans : C)

24. White vitriol is–
(A) FeSO4, 7H2O (B) ZnSO4, 7H2O
(C) MgSO4, 7H2O (D) CuSO4, 7H2O (Ans

25. 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 (Ans : C)

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