CBSE Class 11 (Science) System of Particles and Rotational Motion — practice questions
83 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 (Science) System of Particles and Rotational Motion in the app →A body with a perfectly definite and unchanging shape is called:In a rigid body, the distances between pairs of particles:Is any real body truly rigid?Fixing a body along a straight line leaves only which motion?The fixed line about which a body rotates is its:The rotational counterpart of force is the moment of force, also called:Torque is which kind of quantity?The SI unit of the moment of force is the:If the directions of both r and F are reversed, the torque direction:The rotational analogue of mass is the:The SI unit of moment of inertia is:Moment of inertia is written as M times which square?Moment of inertia measures a body's rotational:Which machine is named as using this property practically?Conservation of angular momentum means conservation of how many components?Conservation of angular momentum is the rotational analogue of conserving:For rotational equilibrium, the sum of the torque components must be:In a rotating rigid body, each particle moves in:A body whose shape never changes and whose particles keep fixed distances apart is a:A block slides down a ramp with every particle moving at the same velocity. Its motion is:A cylinder rolling down a ramp is a combination of translation and:For a cylinder rolling without slipping, the point touching the ground has velocity:The fixed line about which a ceiling fan turns is its:Torque is the rotational analogue of:Pushing a door on its hinge line produces:A rigid body in mechanical equilibrium has zero total force and zero total:Mechanical equilibrium of a rigid body requires how many independent conditions?Two equal and opposite forces with different lines of action form a:A light rod pivoted at a point is an ideal lever. The pivot is the:For a lever, load arm times load equals effort arm times:A lever lifts a big load with a small effort when the effort arm is:You balance a cardboard sheet on a pencil tip. The balance point is its:In uniform gravity the centre of gravity coincides with the:The rotational analogue of mass is:Does the moment of inertia change if a body spins faster?Car engines carry a heavy disc that smooths out jerky speed changes. It is a:The theorem of perpendicular axes applies to bodies that are:When no external torque acts, what stays constant?Spinning on a swivel chair, you stretch your arms out. Your spin:Stretching your arms while spinning slows you because it increases your:In an ideal rigid body, what stays fixed even when forces act on it?A rigid body that is not fixed in any way can have which kinds of motion?In pure translation, how do particle velocities compare?Each particle in fixed-axis rotation moves along which path?Which quantity is common to all points of a rotating rigid body?Angular velocity points along which direction?The magnitude of a x b for vectors a and b at angle θ equals which expression?The direction of a vector product is given by which rule?A force F acts at position vector r. The torque about the origin is?Moment of inertia is the rotational analogue of which linear-motion quantity?A thin ring of mass M and radius R has what I about its central axis?Which device uses a large moment of inertia to smooth speed changes?What does an engine flywheel do because of its large moment of inertia?The moment of inertia of a rigid body depends on which of these?The radius of gyration k is defined through which relation for mass M?What is the dimension of the radius of gyration?A circular disc of radius R has what radius of gyration about its diameter?Two masses m1 and m2 sit at x1 and x2. Where is their centre of mass?A 2 kg and a 3 kg particle are 5 m apart. How far is their CM from the 2 kg one?Where is the centre of mass of a uniform thin ring?Does the centre of mass of a body necessarily lie inside the body?In the HCl molecule, the CM lies nearer which atom?In HCl, nuclei are 1.27 Å apart and Cl is 35.5 times heavier than H. How far is the CM from Cl?A trolley with a child moves at V on a smooth floor. The child runs about. CM speed?If the total external force on a system is zero, what stays constant?What effect do internal forces have on the motion of the CM?K' is the KE about the CM, V the CM speed, M the total mass. Total KE equals K' plus?A couple has what total external force and torque?Total torque on a system is origin-independent when which holds?Centre of gravity coincides with the CM when what holds?Can a body have zero net force but nonzero net torque?For a lever in equilibrium, the principle of moments says load arm x load equals?What is the torque of a 10 N force acting perpendicular to a 0.5 m arm?Angular momentum of a particle about the origin is given by which expression?For rotation about a symmetry axis, which relation links L and ω?Rotational kinetic energy of a rigid body is given by which expression?A person on a spinning chair stretches both arms out. What happens to angular speed?A particle moves in a circle of radius 3 m at angular velocity 2 rad/s. Its linear speed is?Angular acceleration α is defined as which derivative?What is the support point of a lever called?Mechanical advantage of a lever is defined as which ratio?A shell flying along a parabola explodes in mid-air by internal forces. Its fragments' CM then?A cylinder rolls without slipping. What is the velocity of its contact point?