A flywheel of moment of inertia 0.32 kg–m2 is rotated steadily 120 rad/s at by a 50 w electric motor. The kinetic energy of the flywheel is (a) 4608 J (b) 1152 J (c) 2304J (d) 6912J Ans. …
The angular velocity of a body is →w= 2^j+3^k+4^k and a torque →τ = ^j+2^k+3^k acts on it. The rotational power will be (a) 20 W (b) 15 W (c) √17 W (d) √17 W Ans. a (8)
a. Brass is an interstitial alloy, while steel is a substitutional alloy, while steel is a substitutinal b. Brass is a substitutional alloy, while steel is an interstitital alloy c. Brass and steel are both substitutional alloys d. Brass and …
Ag+ << Br– . The AgBr crystal should have the following characteristics a. Defectless (perfect) crystal b. Schottky defect only c. Frenkel defect only d. Both Schottky and Frenkel defects Ans. d Explanation : In AgBr both Schottky and Frenkel …
a. Softer b. less tensile c. less malleable d. more ductile Ans. b Explanation : On adding non-metal the metal become less tensile (4)
(a) Disc (b) Ring (c) Solid sphere (d) All will make same number of rotations Ans. d (15)
a. Establishing thermal equilibrium b. Having tendency to diffuse c. Contributing to scattering d. Introducing new electronic energy levels Ans. a Explanation : Impurity present in a crystal does not establish thermal equilibrium (17)
(a) 400% (b) 800% (c) 200% (d) 100% Ans. b (13)
a. NaCl b. KCl c. CsCl d. All of these Ans. d Explanation : Schottky defects occurs in highly ionic compounds which have high co-ordination number ex. NcCl, KCl, CsCl. (9)
(a) Length (b) Breadth (c) Shape (d) Volume Answer-c (5)
A wheel is rotating with an angular speed of 20 rad/s . It is stopped to rest by applying a constant torque in 4s . If the moment of inertia of the wheel about its axis is 0.20 kg-m2, then …
A rod of length l and radius r is joined to a rod of length l/2 and radius r/2 of same material. The free end of small rod is fixed to a rigid base and the free end of larger …
a. Frenkel defect b. Metal excess defect c. Metal deficiency generally defect d. Schottky defect Ans. b (9)
(a) √4 : √3 (b)√3: √4 (c) √3:√2 (d) √2:√3 Ans. a (4)
a. Positive ions and negative ions are of different size b. Positive ions and negative ions are of same size c. Positive ions are small and negative ions are big d. Positive ions are big and negative ions are small …
(a) 0.002 (b) 0.004 (c) 0.008 (d) 0.016 Answer-b (22)
(a) Protonema (b) Prothallus (c) Proembryo (d) Embryo Ans. a (10)
(a) Pteridophytes (b) Pines (c) Monocots (d) Dicots Ans. a (7)
(a) Gametophyte (b) Sporophyte (c) Both (a) and (b) (d) None of these Ans. b (9)
(a) Total Energy (b) K.E. (c) Angular Velocity (d) Linear Momentum Answer: a (9)
(a) Peristome teeth (b) Annulus (c) Calyptra (d) Operculum Ans. a (5)
(a) Potential energy (b) Kinetic energ (c) Linear momentum (d) Angular momentum Answer:D (10)
(a) Keplers law of areas still holds (b) Keplers law of period still holds (c) Keplers law of areas and period still hold (d) Neither the law of areas, nor the law of period still holds Answer: d (14)
(a) 1032 (b) 1023 (c) 1024 (d) 1043 Answer: a (5)
(a) Tangential velocity is constant (b) Angular velocity is constant (c) Radial velocity is constant (d) Areal velocity is constant Answer: d (17)
(a) Work energy theorem (b) Conservation of linear momentum (c) Conservation of angular momentum (d) Conservation of energy Answer: c (6)
(a) 1.38 (b) 1.383/2 (c) 1.381/2 (d) 1.383 (e) 1.382 Answer:b (6)
(a) T2 ∞ R3 (b) T3 ∞ R2 (c) T2 ∞ (1/R3 ) (d) T3 ∞ (1/ R2 ) Answer: a (3)
(a) 16 L (b) 64 L (c) L/4 (d) 4 L Answer: d (4)
(a) 4.2 years (b) 2.8 years (c) 5.6 years (d) 8.4 years Answer: b (7)
(a) A (b) B (c) C (d) D Answer: c (12)
(a) The time taken in travelling DAB is less than that for BCD (b) The time taken in travelling DAB is greater than that for BCD (c) The time taken in travelling CDA is less than that for ABC (d) …
(a) 53/2 years (b) 52/3years (c) 51/3 years (d) 51/2 years Answer: a (5)
(a) Spirogyra (b) Mucor (c) Moss (d) Both (b) and (c) Ans. c (13)
(a) Copernicus (b) Kepler (c) Galileo (d) None Answer: A (6)
A satellite of mass m is circulating around the earth with constant angular velocity. If radius of the orbit is R0 and mass of the earth M, the angular momentum about the centre of the earth is (a) m√GMR0 …
The largest and the shortest distance of the earth from the sun are r1 and r2 , its distance from the sun when it is at the perpendicular to the major axis of the orbit drawn from the sun (a) …
A metal bar of length L and area of cross-section A is clamped between two rigid supports. For the material of the rod, its Young’s modulus is Y and coefficient of linear expansion is . If the temperature of the …
Two planets move around the sun. The periodic times and the mean radii of the orbits are T1 , T2and r1 ,r2 respectively. The ratio T1/T2 is equal to (a) ( r1 /r2 )1/2 …