By S.O. Pillai
This quantity is floated after going notwithstanding the syllabi and subject matters prescribed through the appointed enterprises of the respective areas. The final one or chapters might be of a few use to the GATE aspirants. The salient good points contain: item kind questions with keys in lots of important parts of Physics can be found; on the finish of every bankruptcy, difficulties chosen from outdated questions papers are handled with options; very important desk of actual constants also are supplied; approximately 800 goal questions with keys are supplied; and, round three hundred difficulties were taken care of with options.
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Sample text
10. The mean free path λ of a gas molecule is related to the molecular density n as 1 (a) λ ∝ n (b) λ ∝ n 1 (c) λ ∝ n2 (d) λ ∝ 2 . n 11. s speed of the molecules of oxygen gas kept in a container at 0°C and at 1 atmosphere is (a) 590 m/s (b) 120 m/s (c) 460 m/s (d) 10 m/s. 12. At what temperature is the mean kinetic energy of a gas molecule one third its mean kinetic energy at 453 K? (a) 151 K (b) 302 K (c) 200 K (d) 183 K. 13. E. of a molecule is (a) kBT 2 (b) kBT 3 k T k T (d) B . 2 B 5 14. The graph below shows the potential energy between two atoms in a diatomic molecule as a function of the distance r between the atoms.
E. of rotation = = 242 joule Ans. 33 MOMENT OF INERTIA... 7. When a particle of mass m rotating in a plane circular path of radius r has an angular momentum I. Calculate centripetal force acting on it. Solution: mv 2 r Angular momentum = mv r = I Centripetal force = mv = I r Thus centripetal force, F= F= m 2 v2 I2 = 2 mr r mr I2 mr 3 Ans. 8. What amount of energy will be liberated if 1000 droplets of water each 10–6 m in diameter coalesce to form one large spherical drop. T. of water = 72 × 10–3 N/m?
30. Transverse wave can travel (a) both in gas and metal (b) in a gas but not in metal (c) neither in gas nor in metal (d) not in gas but in metal. 31. If at same temperature and pressure the densities for two diatomic gases are respectively ρ1 and ρ2, then the ratio of velocity of sound in these gases will be (v1/v2) ρ2 ρ1 (a) ρ 1ρ 2 (b) (c) ρ1 ρ2 (d) ρ1 ρ2. 32. M. is doubled which of the following quantity will be doubled? (a) time period (b) maximum velocity (c) mass (d) total energy. 33. Ultrasonic are used in SONAR with greater advantage because ultrasonics (a) are electromagnetic waves (b) have low frequency (c) can be easily produced (d) have short wavelengths.