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qUESTIONS

MCQs-PYQs-12th-jee

Two masses and M are connected by a light string that passes through a smooth hole O at the centre of a table. Mass lies on the table and M hangs vertically. is moved round in a horizontal circle with O as the centre. If is the length of the string from O to then the frequency with which should revolve so that M remains stationary is

MCQs-PYQs-12th-jee

A stone is rotated steadily in a horizontal circle with a period T by a string of length l. If the tension in the string is kept constant and l increases by 1%, what is the percentage change in T

MCQs-PYQs-12th-jee

The length of the second hand of a watch is 1 cm. The velocity vector of the tip of the second hand in cm per second is –

MCQs-PYQs-12th-jee

The magnitude of displacement of a particle moving in a circle of radius a with constant angular speed ω varies with time t as –

MCQs-PYQs-12th-jee

A stone hanging from a massless string of length 15 m is projected horizontally with speed 147 m/s. Then the speed of the particle at the point where tension in string equals the weight of particle is –

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-

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