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qUESTIONS

MCQs-PYQs-12th-jee

A particle is moving in a circular path. The acceleration and momentum of the particle at a certain moment are m/s2 and kg-m/s. The motion of the particle is

MCQs-PYQs-12th-jee

A simple pendulum of length l and mass m is initially at its lowest position. It is given the minimum horizontal speed necessary to move in a circular path about the point of suspension. The tension in the string at the lowest position of the bob is-

MCQs-PYQs-12th-jee

An aeroplane is moving in a circular path with a speed 250 km/hr; what is the change in velocity in half revolution –

MCQs-PYQs-12th-jee

A small particle of mass 0.36 g rest on a horizontal turntable at a distance 25 cm from the axis of spindle. The turntable is accelerated at a rate of  = 1/3 rad/s–2. The frictional force that the table exerts on the particle 2 s after the startup is-

MCQs-PYQs-12th-jee

A string of length 1m is fixed at one end with a bob of mass 100 g and the string makes rev/s around a vertical axis through a fixed point. The angle of inclination of the string with vertical is-

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 –

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