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qUESTIONS

MCQs-PYQs-12th-jee

A car is moving on an unbanked circular bend of radius 50 m at a speed of 36 km/hr. The angle of banking required for the safe turning of the car is –(Take g = 10 m/s2)

MCQs-PYQs-12th-jee

A pendulum consisting of a small sphere of mass M suspended by an inextensible and mass less string of length l is made to swing in a vertical plane. If the breaking strength of the string is 2Mg, then the maximum angular amplitude of the displacement form the vertical can be –

MCQs-PYQs-12th-jee

A particle describes a horizontal circle in a conical funnel whose inner surface is smooth with speed of 0.5 m/s. What is the height of the plane of circle from vertex of the funnel?

MCQs-PYQs-12th-jee

A small body of mass ‘m’ is attached to one end of a light inelastic string of length l. The other end of the string is fixed. The string is held initially taut and horizontal and then body is released. The centripetal acceleration of the body and the tension in the string when the string reaches vertical position will be –

MCQs-PYQs-12th-jee

A particle is tied to a light inextensible string of length L and whirled in a vertical circle with other end of string as centre. At a certain instant when the string makes angle 0 = 53° with lower vertical its speed is found to be v = , then its acceleration at that instant of time is –

MCQs-PYQs-12th-jee

A circular track of radius 300 m is banked at an angle π/12 radian. If the coefficient of friction between wheel of a vehicle and road is 0.2, the maximum safe speed of vehicle is

MCQs-PYQs-12th-jee

When a ceiling fan is switched off, its velocity falls to half in 36 rotations. How many more rotations it will make?

MCQs-PYQs-12th-jee

A particle describes a horizontal circle at the mouth of a funnel type vessel as shown in figure. The surface of the funnel is frictionless. The velocity of the particle in terms of and will be

MCQs-PYQs-12th-jee

A particle completes 1.5 revolutions in a circular path of radius 2 cm. The angular displacement of the particle will be – (in radian)

MCQs-PYQs-12th-jee

A flywheel rotates at a constant speed of 3000 rpm. The angle described by the shaft in radian in one second is

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