Pondicherry LDC Exam 2023 solved question paper

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

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