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)

Comments

Post a Comment

Popular posts from this blog

PHYSICS-15-10- 11th (PQRS) SOLUTION

XI (PQRS) PHYSICS REVIEW TEST-5 Select the correct alternative. (Only one is correct) [15 × 3 = 45] There is NEGATIVE marking. 1 mark will be deducted for each wrong answer. Q.31 Two trains, which are moving along different tracks in opposite directions towards each other, are put on the same track due to a mistake. Their drivers, on noticing the mistake, start slowing down the trains when the trains are 300 m apart. Graphs given below show their velocities as function of time as the trains slow down. The separation between the trains when both have stopped, is: (A) 120 m (B) 280 m (C) 60 m (D*) 20 m 1 [Sol: x1 = 2 1 × 10 × 40 = 200 m; x2 = – 2 × 8 × 20 = –80 m  xreletive = x1 + x2 = 280  separation = 300 – 280 = 20 m (D) ] Q.32 One end of a thin uniform rod of length L and mass M is riveted to the centre of a uniform circular disc of radius r and mass 2 M so that the rod is normal to the disc. The centre of mass of the combination from the centre of the disc is at dist
Read more

8-Circular Motion

8.1 (D) The maximum angular speed of the hoop corresponds to the situation when the bead is just about to slide upwards. The free body diagram of the bead is For the bead not to slide upwards. m2 (r sin 45°) cos 45° – mg sin 45° < N (1) where N = mg cos 45° + m2 (r sin 45º) sin 45° (2) From 1 and 2 we get.  = rad / s. 8.2 (C) Let v be the speed of particle at B, just when it is about to loose contact. From application of Newton's second law to the particle normal to the spherical surface. mv2 = mg sin  (1) r Applying conservation of energy as the block moves from A to B.. 1 mv2 = mg (r cos  – r sin ) (2) 2 Solving 1 and 2 we get 3 sin  = 2 cos  8.3 (A) As the mass is at the verge of slipping ∴ mg sin37 –  mg cos37 = m2r 6 – 8 = 4.5   = 3 16 8.4 (B) As when they collide vt  1  72v 2  2 2  25R   R = vt  t =   5R 6v Now angle covered by A =   vt R 11 Put t  angle covered by A = 6 8.5 (C) The acceleration vector s
Read more

4. THEORY-Current Electrictricity

CURRENT ELECTRICITY  1 . ELECTRIC CURRENT (a) Time rate of flow of charge through a cross sectional area is called Current. if q charge flows in time interval t then average current is given by q Iav = t and Instantaneous current i =. lim q  dq t0 t dt (b) Direction of current is along the direction of flow of positive charge or opposite to the direction of flow of negative charge. But the current is a scalar quantity. i i q+ velocity q– velocity SI unit of current is ampere and 1 Ampere = 1 coloumb/sec 1 coloumb/sec = 1A 2 . CONDUCTOR In some materials, the outer electrons of each atom or molecule are only weakly bound to it. These electrons are almost free to move throughout the body of the material and are called free electrons. They are also known as conduction electrons. When such a material is placed in an electric field, the free electrons drift in a direction opposite to the field. Such materials are called conductors. 3 . INSULATOR Another class o
Read more