a. Same in all directions b. Different in different directions c. Cannot be measured d. Always zero Ans.a Explanation : Since quartz glass is an amorphous solid having short range order of constituents. Hence value of refractive index is same …
a. Graphite (C) b. Quartz glass (SiO2) c. Chrome alum d. Silicon carbide (SiC) Ans. b Explanation : Quartz glass (SiO2) is an amorphous solid due to its short range order of constituent particles (10)
a. Solid substance in real sense b. Liquid in real sense c. Supercooled liquid d. Substance with definite melting solid Ans. c (6)
a. Weakly bonded together b. Strongly bonded together c. Spherically symmetrical d. Arranged in planes Ans. d Explanation : Crystals show good cleavage because their constituent particles are arranged in planes. (11)
a. Fe3 O4 b. CrO 2 c. H2 O d. MnO Ans. d Explanation : MnO this aries when the dipole alignment is zero due to equal and opposite alignment (9)
a. Octahedral sulphur b. Monoclinic sulphur c. Plastic sulphur d. Colloidal sulphur Ans. a (21)
a. They melt over a range of temperature b. They are anisotropic c. There is no orderly arrangement of particles d. They are rigid and incompressible Ans. b Explanation : Amorphous solid are isotorpic because these substances show same properties …
a. KCl b. Glass c. lce d. Diamond Ans.b Explanation : Amorphous or non- crystalline solids do not have sharp melting point. (9)
a. Changes abruptly form solid to liquid when heated b. Has no definite melting point c. Undergoes deformation of its geometry easily d. Has an irregular 3- dimensional arrangements e. Softens slowly Ans. a Explanation : In crystalline solid there …
a. All the domains get oriented in the direction of magnetic field b. All the domains get oriented in the direction opposite to the direction of magnetic field c. Domains get oriented randomly d. Domains are not affected by magnetic …
a. Pyro – electricity b. Piezo electricity c. Ferro- electricity d. Ferri- electricity Ans. a Explanation : It is the definition of pyro-electricity (10)
a. Glass b. Rubber c. Plastic d. Sugar Ans. d Explanation : Sugar is a crystalline solid while glass, rubber and plastic are amorphous solids (3)
a. Si b. NaF c. Al d. Ar Ans. a Explanation : Silicon is a covalent crystal in which constituent particles are atoms. (8)
a. Silica b. Sodium silicate c. Silicon carbide d. Silicon Ans.a Explanation : Quartz is a covalent crystal having a framework of silicates or silica, i.e. a three dimensional network when all the four oxygen atoms of each of SiO4 …
a. They prossess high melting point and boiling point b. All are electrolyte c. Exhibit the property of isomorphism d. Exhibit directional properties of the bond Ans. d Explanation : Ionic srystals exhibit non-directional properties of the bond (12)
a. The capacity of layers of metal ions to slide over the other b. The interaction of electrons with metal ions in the other c. The presence of electrostatic force d. The crysyalline structure in metal Ans.a Explanation : When …
a. MnO 2 b. TiO 2 c. VO 2 d. CrO 2 Ans. a Explanation : MnO 2 is antiferromagnetic (9)
a. Paramagnetic substances are weakly attracted by magnetic field b. Ferromagnetic substances cannot be magnetised c. The domains in antiferromagnetic substances are oppositely oriented with respect to each other d. Pairing of electrons cancels their magnetic moment in the diamagnetic …
a. Very low value of electrical conductivity in the molten state b. Brittle nature c. Very strong forces of interactions d. Anisotropic nature Ans. a Explanation : Ionic solids easily dissociated into its ions in molten state and show high …
a. A regular arrangement of constituent particles observed over a short distance in the crystal lattice b. A regular arrangement of constituent particles observed over a long distance in the crystal lattice c. Same arrangement of constituent particles in different …
a. High temperature b. Low temperature c. High thermal energy d. Weak cohesive forces Ans. b (9)
a. Ionic crystal b. Covalent crystal c. Metallic crystal d. Molecular crystal Ans. d Explanation : Wax crystal are molecular crystal in which constituent particles are molecules having inter particle forces are Vander Waal ‘s forces. (8)
a. Atoms as their structural units b. Molecules as structural units c. Ions held together by electrostatic forces d. High melting points Ans. a Explanation : constituent paritcles of covalent compounds are atoms. (9)
a. Electrical attraction forces b. Vander Waal’s forces c. Covalent bond forces d. Strong electrostatic attraction forces Ans. c Explanation : Quartz is a covalent solid in which constituent particles are atoms which are held together by covalent bond forces. …
7. The compressibility of water is 4×10-5 per unit atmospheric pressure. The decrease in volume of 100 cubic centimeter of water under a pressure of 100 atmosphere will be (a) 0.4 cc (b) 4×10-5 cc (c) 0.025 cc …
a. Both the bands are overlapped with each other b. Very small c. Infinite d. Very large Ans. d Explanation : When insulators (non metal atoms) interact to form a solid their atomic orbitals mix to form two bunches of …
a. Pyroelectricity b. Ferroelectricity c. Peizoelectricity d. Ferrielectricity Ans. c Explanation : When polar crystal is subjected to a mechanical stress, electricity is produced a case of piezoelectricity. Reversely if electric field is applied mechanical stress is developed. Piezoelectric crystal …
a. Isomers b. Isotopes c. Allotropes d. Polymers Ans. c Explanation : Diamond and graphite are the crystalline allotropes of carbon (7)
a. Amorphism b. Isomophism c. Polymorphism d. Isomerism Ans. c Explanation : Polymorphism is an ability of a substance which shows two or more crystalline structure. (8)
a. Dryer b. Buffering agent c. Antiseptic d. Softener Ans.c Explanation : Bithional is added to soap as an antiseptic (8)
a. Long range order b. Short range order c. Disordered arrangement d. None of these Ans. a Explanation : Crystalline solids have regular arrangement of constituent particles, sharp melting points and are anisotropic (10)
a. In solid NaCl there are no ions b. Solid NaCl is covalent c. In solid NaCl there is no velocity of ions d. In solid NaCl there are no electrons Ans. c Explanaton :Solid NaCl is a bad conductor …
a. Covalent solids b. Ionic solids c. Pseudo solids d. Molecular solids Ans. b Explanation : Ionic solids have highest melting point due to strong electrostatic forces of attraction (6)
a. It both assertion and reason are true and the reason is the correct explanation of the assertion b. If Both assertion and reason are true but reason is not the correct explanation of the assertion c. If assertion is …
a. Anisotropic b. Isotropic c. Hard d. Dense Ans. b Explanation : Not isotropic actually refers to anisotropic here. (13)
a. BatiO 3 b. K 4 [Fe(CN) 6 ] c. PB 2 O 3 d. PbZrO 3 Ans. a Explanation : BaTio 3 is a ferroelectric compound. (9)
a. Metallic b. Molecular c. Network d. Ionic e. Amorphous Ans. d Explanation : Properties of ionic solid (7)
a. It both assertion and reason are true and the reason is the correct explanation of the assertion b. If Both assertion and reason are true but reason is not the correct explanation of the assertion c. If assertion is …
a. It both assertion and reason are true and the reason is the correct explanation of the assertion b. If Both assertion and reason are true but reason is not the correct explanation of the assertion c. If assertion is …