(a) 0.3 rad/s (b) 5.3 rad/s (c) 10.3 rad/s (d) 89.3 rad/s Ans. c (9)
a. Frenkel defect b. Sohottky defect c. Intersitital defects d. F- centre Ans. d Explanation : When electorns are trapped in anion vacancies these are called F centres (8)
(a) 2.4 (b) 1.2 (c) 0.4 (d) 0.2 Answer-d (17)
(a) Non zero constant (b) Infinite (c) Zero (d) Can not be predicted Answer-c (18)
(a) 0.3 rad/s (b) 5.3 rad/s (c) 10.3 rad/s (d) 89.3 rad/s Ans. c (5)
a. F centre b. Frenkel c. Sohottky d. Interstital Ans. c Explanation : During the schottkky defects same number of cations and anions are missing from their lattice site so density is decreased. (9)
a. Schotky defect b. Frenkel defect c. Stoichiometric defect d. F- centres Ans. d Explanation : F- centres are the sites where anions are missing and instead electrons are present they are responsible for colour. (6)
(a) Zero (b) Infinity (c) 2×1010 N/m2 (d) 3×1010 N/m2 Answer-b (10)
Moment of inertia of uniform rod of mass M and length L about an axis through its centre and perpendicular to its length is given by ML2/12 . Now consider one such rod pivoted at its centre, free to rotate …
(a) r1 2 /r2 2 (b) r2 2 /r1 2 (c) r2 4 /r1 4 …
a. Frenkel defect b. Interstitial positions c. F- centres d. Schottky defects Ans. c (6)
a. Interstitial defect b. Valency defect c. Frenkel defect d. Schottky defect Ans. c (8)
The Young’s modulus of the material of a wire is 6×1012 N/m2 and there is no transverse strain in it, then its modulus of rigidity will be (a) 3×1012 N/m2 (b) 2×1012 N/m2 (c) 1012 N/m2 …
A smooth uniform rod of length L and mass M has two identical beads of negligible size, each of mass m, which can slide freely along the rod. Initially the two beads are at the centre of the rod and …
(a) Shearing (b) Longitudinal (c) Volume (d) Transverse Answer-a (5)
(a) 3Y=K(1-σ) (b) K=(9ηY)/(Y+η) (c) σ=(6K+η)Y (d) σ=(0.5Y-η)/η …
a. Nucleus defects b. Non-crystal defects c. Crystal defects d. None of these Ans. c Explanation : Both are stoichiometric crystalline defects (6)
Two discs of moment of inertia I1 and I2 and angular speeds ω1 and ω2 are rotating along collinear axes passing through their centre of mass and perpendicular to their plane. If the two are made to rotate together along the …
a. Increases b. decreases c. Does not change d. Changes Ans. c Explanation : Since no ions are missing from the crystal as s whole, there is no effect on density (28)
(a) 4 : 1 (b) 16 : 1 (c) 8 : 1 (d) 1 : 1 Answer-d (44)
(a) Too less (b) Greater than all matters (c) Less than all matters (d) Zero Answer-b (9)
19. The pressure applied from all directions on a cube is P. How much its temperature should be raised to maintain the original volume ? The volume elasticity of the cube is β and the coefficient of volume expansion is …
a. Schottky defects have no effect on the density of crystalline solids b. Frenkel defects decrease the density of crystalline solids c. Frenkel defect is a dislocation defect d. Frenkel defect is found in halides of alkaline metals. Ans. c …
The position of a particle is given by : →r = (^i+2^j-^k) and momentum →p =(3^i+4^j-2^k) . The angular momentum is perpendicular to (a) X-axis (b) Y-axis (c) Z-axis (d) Line at equal angles to all the three axes Ans. …
21. For a constant hydraulic stress on an object, the fractional change in the object’s volume (ΔV/V) and its bulk modulus (B) are related as (a) (ΔV/V) ∝ B (b) (ΔV/V) ∝ 1/B (c) …
a. Electron are held in the voids of crystals b. F- centre produces colour to the crystal c. Conductivity of the crystal increases due to F- centre d. All of the above Ans.d Explanation : All the given statements are …
A circular platform is free to rotate in a horizontal plane about a vertical axis passing through its center. A tortoise is sitting at the edge of the platform. Now, the platform is given an angular velocity w0. When the …
a. A 2 BO4 b. A 2 B 2 O c. A B2 O4 d. A 4 B2 O Ans. c (36)
A2 B 2 has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms: a. hcp lattice – A, 2/3 Tetrahedral voids B b. hcp lattice – B, 1/3 Tetrahedral …
20. The pressure of a medium is changed from 1.01 × 105 Pa to 1.165 × 105 Pa and change in volume is 10% keeping temperature constant. The Bulk modulus of the medium is (a) 204.8 ×105 Pa (b) …
(a) Young’s modulus (b) Coefficient of volume elasticity (c) Modulus of rigidity (d) Poisson’s ratio Answer-b (11)
(a) Mω (b) (M+4m)ω/M (c) (M-4m)ω/M+4m (d) Mω/4m Ans. a (8)
O2- ions where half the octahedral voids are occupied by Al 3+ and one eight of the tetrahedeal voids are occupied by Mn2+ . The chemical formula of the mineral is. a. Mn3 Al 2 O 6 b. Mn Al 2 O 4 c. …
(a) Zero (b) Unity (c) Infinity (d) Between 0 to 1 Answer-c (16)
a. 2 b. 4 c. 6 d. 8 Ans. d (11)