11) Which one of the following is not a property of salts?
(A) Salts have ordered packing arrangements called lattices
(B) Salts have low melting points but high boiling points
(C) Salts are brittle
(D) Salts conduct electricity in molten state
12) Buckminster-fullerene is
(A) an allotrope carbon
(B) a polymer of fluorine
(C) an isotope of carbon heavier than CCl4
(D) None of the above
13) Which among the following is not a polymer?
(A) Nylon
(B) Teflon
(C) Caprolactam
(D) Polyaterene
14) Which of the following is called wood spirit?
(A) Ethyl Alcohol
(B) Methyl Alcohol
(C) Glycerol
(D) Ethylene Glycol
15) When a person lifts an object in his hand to certain height __ energy is stored in the object.
(A) Kinetic energy
(B) Potential energy
(C) Chemical energy
(D) Electrical energy
16) Hydrometers and Lacto Meters work on the principle of
(A) Pascal’s law
(B) Archimede’s principle
(C) Bernoulli’s principle
(D) Boyle’s law
17) Goldsmiths use aqua-regia which is a combination of
(A) Nitric acid and sulphuric acid
(B) Nitric acid and hydrochloric acid
(C) Sulphuric acid and hydrochloric acid
(D) Citric acid and benzoic acid
18) Which of the following is an example of organic semiconductor?
(A) Gas
(B) Polypyrrole
(C) Anthracene
(D) All of the a bove
19) In a nuclear reactor, heavy water is used to _
(A) Accelerate the neutrons
(B) Slow down the speed of neutrons
(C) Decrease the number of ne utrons
(D) Increase the number of neutrons
20) Optical fibre works on the principle of
(A) Refraction
(B) Scattering
(C) Total internal reflection
(D) None of the above