Physics-DPP-1-5.Thermometry, Thermal Expansion and Kinetic Theory of Gases

PHYSICS Topic: Thermometry, Thermal Expansion and Kinetic Theory of Gases Date: 1. The average speed of molecules in a gas is given by : (a) (b) (c) (d) 2. Identify which pair of state parameters can completely describe the system : (a) P and V (b) P and ρ (c) P and U (d) all of these 3. A uniform metal rod is used as a bar pendulum. If the room temperature rises by 100C and the coefficient of linear expansion of the metal of the rod is 2  10–6/0C, the period of the pendulum will have percentage increase of : (a) –2  10–3 (b) –1  10–3 (c) 2  10–3 (d) 1  10–3 4. 80 g of water of 300C are poured on a large block of ice at 00C. the mass of ice that melts is : (a) 30 g (b) 80 g (c) 1600 g (d) 150 g 5. A beaker contains 200 g of water. The heat capacity of the beaker is equal to that of 20 g of water. the initial temperature of water in the beaker is 200C. If 440 g of hot water at 920C is poured in it, the final temperature (neglecting radiation loss) will be nearest to : (a) 580C (b) 680C (c) 730C (d) 780C 6. 100 g of ice at 00C is mixed with 100 g of water at 1000C. What will be the final temperature of the mixture : (a) 100C (b) 200C (c) 300C (d) 00C 7. A block of mass 100 g slides on a rough horizontal surface. If the speed of the block decreases from 10 m/s to 5 m/s, the thermal energy developed in the process is: (a) 3.75 J (b) 37.5 J (c) 0.375 J (d) 0.75 J 8. In a vertical U-tube containing a liquid, the two arms are maintained at different temperatures t1 and t2. The liquid columns in the two arms have heights l1 and l2 respectively. The coefficient of volume expansion of the liquid is equal to : (a) l1 – l2 l2t1 – l1t2 (b) l1 – l2 l1t1 – l2t2 (c) l1 + l2 l2t1 + l1t2 l1 + l2 (d) l1t1 + l2t2 9. The coefficient of linear expansion of crystal in one direction is  and that in other two directions perpendicular to it is  . The 1 2 coefficient of cubical expansion is : (a)    (b)    (c)    (d) none of these 1 2 1 2 1 2 10. A block of ice at –100C is slowly heated and converted to steam at 1000C. Which of the following curves represents the phenomenon qualitatively ? (a) (b) (c) (d) PHYSICS Topic: Thermometry, Thermal Expansion and Kinetic Theory of Gases Date: Answer Key 1. (d) 2. (d) 3. (d) 4. (a) 5. (b) 6. (a) 7. (a) 8. (a) 9. (c) 10. (a)

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