Physics Class 11 unit 4 Rotational and circular motion Exercises MCQs sindh board physics new book

#mdcat #sttb #XiPhysics Unit 5 Work power and energy Exercise MCQs solution    • Physics Class 11 unit 5 Work energy nad po...   chapter 3 Dynamics mcqs solution    • Physics Class 11 Chapter 3 Dynamics MCQs |...   chap 02 kinematics exe mcqs    • Physics Class 11 chapter 2 Kinematics exer...   1. One radian is about 2. Wheel turns with constant angular speed then: a) each point on its rim moves with constant velocity b) each point on its rim moves with constant acceleration c) the wheel turns through equal angles in equal times d) the angle through which the wheel turns in each second increases as time goes on e) the angle through which the wheel turns in each second decreases as time goes on 3. The rotational inertia of a wheel about its axle does not depend upon its a) diameter c) distribution of mass b) mass d) speed of rotation 4. A force with at given magnitude is to be applied to a wheel. The torque can be maximized by a) applying the force near the axle, radially outward from the axle. b) applying the force near the rim, radially outward. c) applying the force near the axle, parallel to a tangent to the wheel. d) applying the force at the rim, tangent to the rim 5. An object rotating about a fixed axis, I is its rotational inertia and a is its angular acceleration. Its a) is the definition of torque b) is the definition of rotational inertia c) is definition of angular acceleration d) follows directly from Newton's second law. 6. The angular momentum vector of Earth about its rotation axis, due to its daily rotation is, directed a) tangent to the equator towards east b) tangent to the equator towards the west c) north d) towards the Sun. 7. A stone of 2 kg is tied to a 0.50 m long string and swung around a circle at angular velocity of 12 rad/s. The net torque on the stone about the center of the circle is a) 0 N.m c) 12 N.m b) 6 N.m d) 72 N.m 8. A man, with his arms at his sides, is spinning on a light frictionless turntable. When he extends his arms a) his angular velocity increases b) his angular velocity remains same c) his rotational inertia decreases d) his angular momentum remains the same. 9. A space station revolves around the earth as a satellite, 100 km above the Earth's surface. What is the net force on an astronaut at rest inside the space station? a) equal to her weight on earth b) a little less than her weight on earth c) less than half her weight on earth d) zero (she is weightless) 10. If the external torque acting on a body is zero, then its a) angular momentum is zero b) angular momentum is conserved c) angular acceleration is maximum d) rotational motion is maximum