Tiêu đề 13. KINETIC THEORY.pdf ✅

PAPER 1 (1.) The mean free path is average distance covered by a molecule between two successive collision. (1) 2 2 d n   = (2) 2 n 2 d   = (3) 2 1 2n d   = (4) 2 1 2 2n d   = (2.) What is the total translational kinetic energy (1) 0 3 2 n RT (2) 3 RT 2 (3) 1 RT 2 (4) 0 1 2 n RT (3.) Four molecules have speeds 2 km / sec,3 km / sec , 4 km / sec and 5 km / sec . The root mean square speed of these molecules (in km / sec ) is (1) 54 / 4 (2) 54 / 2 (3) 3.5 (4) 3 3 (4.) On which factor does the average kinetic energy of gas molecules depend? (1) Nature of the gas (2) Temperature (3) Volume (4) Mass (5.) What is the average velocity of the molecules of an ideal gas? (1) Infinity (2) Constant (3) Unstable (4) zero (6.) The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300 K is? (1) 2 7 (2) 1 7 (3) 3 5 (4) 6 5 (7.) Assuming ideal gas properties, which of the following occupies the most volume at 273 K and 1 atm of pressure? (1) One mole of oxygen gas (2) They all occupy the same volume (3) One mole of nitrogen gas (4) One mole of hydrogen gas (8.) Relation between pressure and kinetic energy : (1) 2 3 P E = (2) 3 2 P E = (3) 4 3 E P = (4) 4 3 P E = (9.) All of the following are properties of ideal gases except : (1) Gas molecules do not interact with each other except during collisions (2) Collisions between gas molecules are completely elastic (3) Volume occupied by molecules is negligible compared to the volume occupied by the gas
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(4) Small amounts of energy are lost during collisions between gas molecules (10.) At Boyle's temperature : (1) Joule's effect is positive (2) Van der Waal's equation becomes zero (3) Gases obey's Boyle's law (4) Water solidifies (11.) If Vp denotes most probable velocity of at T , and V0 stand for root means square velocity then which of these is correct (1) V : V 2 : 3 p 0 = (2) 0 : 1:1 V V p = (3) V : V 2 :3 p 0 = (4) 0 : 2 :3 V V p = (12.) The degree of freedom of a triatomic gas is : (1) 1 (2) 2 (3) 6 (4) 8 (13.) How many diagrams showing relationships between pressure, volume, and temperature below is/are incorrect for ideal gasses ? Choose one answer (1) Only two (2) Only one (3) Only three (4) None (14.) For Charle's Law : (1) T = Constant (2) P V = Constant
(3) V  = Constant (4) T  = Constant (15.) Equation of Real gas is : (1) PV nRT = (2) PV nKT = (3) ( ) 2 2 a P v b nRT n v     + − =   (4) ( ) 2 2 n a P v nb nRT v     + − =   (16.) A bulb contains one mole of hydrogen mixed with one mole of oxygen at temperature T . The ratio of rms values of velocity of hydrogen molecules to that of oxygen molecules is ? (1) 1:16 (2) 1: 4 (3) 4:1 (4) 16:1 (17.) Why does the pressure of an ideal gas increase when it is heated at constant volume? (1) The gas molecules expand (2) The molecules move at the same speed, but (3) The molecules move faster and hit the walls more often (4) The number of molecules of gas increases (18.) An inflated rubber balloon contains one mole of an ideal gas, has a pressure P , volume V and temperature T . If the temperature rises to 1.1 T , and the volume is increased to 1.05 V , the final pressure will be : (1) 1.1P (2) P (3) less than P (4) between P and 1.1P (19.) In a diatomic molecules, the rotational energy at a given temperature (A) obeys Maxwell's distribution (B) have the same value for all molecules (C) equals the translational kinetic energy for each molecule (D) is (2 / 3) rd the translational kinetic energy for each molecule (1) AB, (2) BC, (3) A D, (4) B A C , , (20.) Two molecules of gas have speeds of 16 1 9 10 ms  and 6 1 10  respectively. What is the root mean square speed of these molecules? (1) 6 1 45 10 ms−  (2) 6 1 41 10 ms−  (3) 41 6 1 10 ms 2 −  (4) 6 1 81 10 ms−  (21.) A gas mixture consists of molecules of AB, and C with masses mmm A B c   Rank three types of molecules in decreasing order of rms speeds. (1) ( rms rms rms ) ( ) ( ) B C A vvv   (2) ( rms rms rms ) ( ) ( ) A B C v v v  