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qUESTIONS

MCQs-PYQs-12th-jee

A wheel turning with angular speed of 30 rev/s, is brought to rest with a constant acceleration. It turns 60 rev before it stops the time that elapses before it stops is

MCQs-PYQs-12th-jee

The rotors velocity of a helicopter engine changes from 330 rev/min to 110 rev/min in 2 min. How long does the rotor blades take to stop?

MCQs-PYQs-12th-jee

The car is moving at a speed of 72km/h and the radius of the wheels is 0.25 m. If the wheels are starting twenty rotations by applying brakes the angular retardation produced by the brakes is

MCQs-PYQs-12th-jee

A point P on the rim of a way this initially addressed and in contact with the ground. Find the displacement of the point P if the radius of the wheel is 5m and the wheel rolls forward through half revolution

MCQs-PYQs-12th-jee

A cyclist starts from centre O of a circular park of radius 1 km and moves along the path OPRQO as shown in figure. If he maintains constant speed of 10 m s-1, what is his acceleration at point R?

MCQs-PYQs-12th-jee

A particle is moving on a circular path of radius r with uniform speed v. What is the displacement of the particle after it has described an angle of ?

MCQs-PYQs-12th-jee

A particle is given an initial speed u inside a smooth spherical shell of radius R =1 m that it is just able to complete the circle. Acceleration of the particle when its velocity is vertical is –

MCQs-PYQs-12th-jee

A string of length L is fixed at one end and carries a mass M at the other end. The string makes 2/π revolutions per second around the vertical axis through the fixed end as shown in the figure, then tension in the string is –

MCQs-PYQs-12th-jee

A jeep runs around the curve of radius 0.3 km at a constant speed of 60 ms-1. The resultant change in velocity, instantaneous acceleration and average acceleration over 600 arc are

MCQs-PYQs-12th-jee

A particle moves in a circle of radius 4 cm clockwise at constant speed of 2 cm s-1. If and are unit acceleration vectors along x and y axes, respectively, the acceleration of the particle at the instant half way between PQ is given by

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