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ISC Class XI Notes 2025 : Physics (Mahadevi Birla Shishu Vihar, Kolkata)

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Section-A Q.1. (A) Choose the correct alternative (a), (b), (c) or (d) for each of the questions given below : () Ablock of mas 20 kg is on ahorizontal plane of coeficient of friction 0.5., By applying 6.0 newton fote on it, frictional force willbe (g = 10 m/s). (d) 4 newton (c) 16 newton (b) 6 newton 1 (i) Aparticde moves in acircle of radius 25 cm at 2revolutiorn per second. The acceleration of the particle in (a) 10 newton meter per second is: (a) (b) &rr2 (d) 22 (c) 4r2 1 (ii)A force of 100 Nis appied horizontally on ablock of mass 10 kg placed on ahorizontal floor of coefficient of friction 0.5. The acceleration of the block is (take g=10ms). (c) 10 ms-2 (b)5.2 ms-2 (a) Zero (d) 5 ms-2 1 3x1 (B) Answer the following questions briefly and to the point: () Twoparticles of same mass are revolving in circular paths having radii r,and r, with the same speed. Compare their centripetal forces. (i) Sand is thrown on tracks covered with snow in hilly areas. Why ? (i)lsa train moving on acircular track, an inertial frame of reference ? 1 1 1 Section-B Q.2. Static-friction is a self- adjusting force. Comment. Q.3. Ahose has to pullacart harder in the initial stage of his motion. Why ? Q.4. A10kg mass is suspended by a2m long rope of negligible mass. Ahorizontal force of 50N is appied at the mid point of the rope. Find the angle made by the rope with the vertical in equilibrium. OR The bob of mass mof a simple pendulum of length l is displaced through 90 from its mean position and then released. Calculate the speed of the bob and the tension in the thread when the bob passes through the mean 2 position. Q.5. How do we save petrol by keeping the rubber tyre of our vehicde fully inflated? Q.6. An elevator of mass 4000 kg is accelerating upward. If the tension in the supporting cable is 44000 N, find the acceleration of the elevator. Staring from rest what will be the distance covered in 5 s ? (g= 10 ms') 2 OR Atrolly of mass 250 kg carrying abag containing 25 kg sand is moving with uniform speed of 20 km h on a smooth road. After some time, sand begins to leak out of a hole on the trolly's floor at a rate of 0.5 kg s. What will be the speed of the trolly after the entire bag is empty. 2 Section-C [3x3] Q.7. Distinguishbetween Centrifugal and centripetal forces. Give examples. 3 0.8. (a) Defineangular momentum, write its unit and obtain relation for angular momentum in terms of moment of 3 inertia and angular velocity. OR (b) A10 g bullet is fired at a plank of wood with aspeed of 200 m/s. After passing through the plank whichis 1.0mthick the speed of the bullet reduces to 100 ms. Find the average resistance offered by the plank 3 o9. Ablockof mass 2 kg is placed on the floor. The coefficientof static friction it 0.4. A force F of2.5 N is applied on the block,as shown. Calculate the forceF of friction between the block and the floor. (g=10 m/s). Section-D o. 10. (a) Define angle of friction, angle of repose and obtain the relation for angle of repose. (i.e., O= tan-' es). [1 x 5] OR (b) An automobile is moving on a straight horizontal road with a speed u. If the coefficient of static friction between the tyres and the road is s what is the shortest distance in which the automobiles can be stopped? 5

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